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several anomalies in the neutrino sector are pointing towards the existence of a new (sterile) neutrino state with a mass around 1 ev. the solid experiment is located at the sck•cen br2 research reactor in belgium and will investigate this possibility. using the large flux of anti-neutrino generated in the reactor, it ... | solid: search for oscillations with a lithium-6 detector at the sck•cen br2 reactor |
the numi off-axis electron neutrino appearance (nova) experiment can detect muon neutrinos and measure their disappearance via oscillation between the near and far detectors. we will present recent results of muon neutrino disappearance analysis on 50% higher statistics then previous published results. better signal se... | muon neutrino disappearance at nova |
prospect, the precision oscillation and spectrum experiment, is a reactor antineutrino experiment at a very short baseline. the prospect detector consists of a segmented 6li-doped liquid scintillator deployed at the onrl high flux isotope reactor (hfir) with minimal overburden (< 1 m.w.e.). this location provides on... | cosmic ray boosted dark matter at prospect - experimental analysis |
the dune experiment is part of the next generation of neutrino oscillation experiments that seek to definitively answer key questions in the field. it will utilize liquid argon time projection chambers (lartpcs) enabling sub-mm spatial resolutions for unprecedented sensitivity. as part of prototyping designs for such a... | measurement of electron lifetime by the lar purity monitoring system at protodune-sp |
the 4 10 kt liquid argon time projection chambers (lar-tpcs) of the future dune experiment will enable precise measurements of the oscillation parameters and the discovery of cp violation for leptons, thanks to their excellent 3d imaging capabilities coupled with a high-resolution calorimeter. one or more modules of th... | energy reconstruction in dune-dp |
nova is a long-baseline neutrino oscillation experiment, designed to make precision neutrino oscillation measurements using νμ disappearance and νe appearance. it consists of two functionally equivalent detectors and utilizes the fermilab numi neutrino beam. nova uses a convolutional neural network for particle identif... | data-driven cross checks for electron neutrino selection efficiency in nova |
orca (oscillations research with cosmics in the abyss) is a megaton-scale cherenkov neutrino detector currently under construction by the km3net collaboration, at a depth of 2450m in the mediterranean sea. atmospheric neutrinos cross the earth along a wide range of baselines, undergoing matter effects which enhance neu... | sensitivity of orca to the neutrino mass ordering and oscillation parameters |
atmospheric neutrinos are produced by cosmic ray interactions in the atmosphere. these neutrinos have been used to study neutrino oscillations. i will discuss the neutrino oscillation studies with atmospheric neutrinos. | atmospheric neutrinos |
the deep underground neutrino experiment is a next-generation long-baseline neutrino oscillation experiment based on liquid argon time projection chamber technology. dune-s single-phase prototype protodune-sp at cern finished its two-year phase-1 running in july 2021, successfully collected test-beam and cosmic ray dat... | purity monitoring for protodune-sp |
the module-0 demonstrator is a ton-scale single-phase liquid argon time projection chamber (lartpc) operated as a prototype for the dune liquid argon near detector (nd-lar). based on the argoncube design concept, module 0 features true 3d pixelated charge readout, an advanced high-coverage photon detection system, and ... | demonstration of a novel, ton-scale, single-phase lartpc with pixelated readout |
the large-scale water-based liquid scintillator (wbls) detector is a new opportunity for the neutrino community to accomplish competent long-baseline neutrino oscillation and unprecedented low-energy neutrino measurements. several table-top wbls detection systems have been implemented at bnl and lbnl. it is critical to... | results from 1-ton wbls testbed at bnl |
the deep underground neutrino experiment (dune) is a next-generation long-baseline neutrino oscillation experiment based on liquid argon time projection chamber (lartpc) technology. dune's single-phase (sp) prototype protodune-sp (pd-sp) at cern finished its two-year phase-1 running in july 2021, successfully collected... | purity monitoring for protodune-sp |
the deep underground neutrino experiment (dune) will address open issues in neutrino physics such as the measurement of the cp-violating phase in neutrino oscillations and the neutrino mass ordering. the module-0 demonstrator is a single-phase liquid argon time projection chamber (lartpc) operated as a prototype for th... | charge readout system in dune liquid argon near detector module-0 |
we study the model with three right-handed neutrinos which masses are smaller than the weak scale ${\cal o}(10^2)$ gev (called as the $\nu$msm). the model can explain the origin of neutrino masses by the seesaw mechanism, offer a candidate of dark matter and realize the baryogenesis via neutrino oscillation. the seesaw... | probing baryon asymmetry of the universe by using lepton universality |
the deep underground neutrino experiment (dune) is a next-generation long base-line neutrino experiment, which aims to answer some of the fundamental questions about the universe. dune will measure the oscillation probabilities of neutrinos and antineutrinos at unprecedented precision to quantify the charge-parity (cp)... | development of the pulsed neutron source for dune detector calibration |
the deep underground neutrino experiment (dune) is a leading-edge experiment for long-baseline neutrino oscillation studies, neutrino astrophysics and nucleon decay searches. protodune-dual phase (dp) is a 6 × 6 × 6 m3 liquid argon time-projection-chamber (lartpc) operated at the cern neutrino platform in 2019-2020 as ... | scintillation light detection in the 6-m drift length protodune dual phase liquid argon tpc |
the no νa experiment is a νe appearance neutrino oscillation experiment at fermilab. it identifies the νe signal by the electromagnetic (em) showers induced by the electrons in the final state of neutrino interactions. cosmic muon induced em showers, dominated by bremsstrahlung, are abundant in no νa far detector. we u... | cosmic muon-removal technique for no νa experiment |
recently, the idea of using neutrino oscillations to measure the hubble constant was introduced. we show that such a task is unfeasible because for typical energies of cosmic neutrinos, oscillations average out over cosmological distances and so the oscillation probability depends only on the mixing angles. | using neutrino oscillations to measure h0? |
the km3net experiment is a next-generation neutrino telescope, consisting of two separate detection structures, organised as arrays of light sensors, and immersed in the depths of the mediterranean sea. the two detectors are the oscillation research with cosmics in the abyss (orca detector), located off the coast of fr... | multi-messenger observations with the km3net telescope: search for high energy neutrinos coinciding with fast radio bursts |
several anomalies in the neutrino sector are pointing towards the existence of a new (sterile) neutrino state with a mass around 1 ev. the solid experiment is located at the sck•cen br2 research reactor in belgium and will investigate this possibility. using the large flux of anti-neutrino generated in the reactor, it ... | solid: search for oscillations with a lithium-6 detector at the sck•cen br2 reactor |
now 2016 is the 9th workshop of a series started in 1998 in amsterdam. since the year 2000, this international workshop takes place in otranto (lecce, italy). now is locally organized by the infn sections and depts. of physics of bari and lecce, and is one of the few "major conference series" recognized by inspires in ... | neutrino oscillation workshop |
sox (short distance neutrino oscillations with borexino) is a new experiment that takes place at the laboratori nazionali del gran sasso (lngs) and it exploits the borexino detector to study the neutrino oscillations at short distance. in different phases, by using two artificial sources 51cr and 144ce-144pr, neutrino ... | the sox experiment in the neutrino physics |
pair-instability supernovae (pisne) are an exotic class of supernovae which, in addition to being fascinating in its own right (its very existence is a topic of debate), may be important for many areas of astrophysics (early stellar populations, galaxy/chemical evolution, cosmic reionization, etc.). at present, pisne a... | multidimensional pair-instability supernova simulations and their multi-messenger signals |
in mountainous landscapes such as the central alps of europe, the bedrock topography is one of the most interesting subjects of study since it separates the geological substratum (bedrock) from the overlying unconsolidated units (ice). the geometry of the bedrock topography puts a tight constraint on the erosional mech... | bedrock topography beneath uppermost part of aletsch glacier, central swiss alps, revealed from cosmic-ray muon radiography |
utilizing powerful nuclear reactors as antineutrino sources, high mountains to provide ample shielding from cosmic rays in the vicinity, and functionally identical detectors with large target volume for near-far relative measurement, the daya bay reactor neutrino experiment has achieved unprecedented precision in measu... | recent results from daya bay |
the opera experiment was designed to observe νμ→ντ oscillations through τ appearance on the cern neutrino to gran sasso (cngs) beam over a baseline of 730 km. opera was a hybrid experiment composed of lead plates and emulsion layers acting as a target for neutrino interactions. the experiment was complemented with elec... | results from the opera experiment in the cngs beam |
danss is a highly segmented detector, which contains 2500 one meter long plastic scintillator strips. the danss detector is placed under an industrial reactor of the kalininskaya nuclear power plant. the distance to the core is varied on-line from 10.7 to 12.7 m, and the primary task of the experiment is a search for s... | cosmic muons measurements in the danss experiment |
nova is a long-baseline neutrino oscillation experiment with functionally identical, segmented, tracking calorimeter near and far detectors. the detectors lie 14.6 mrad off-axis from the fermilab numi beam, with a well-defined peak in neutrino energy at 2 gev. the absolute calibration of the energy scale of the detecto... | π0 mass reconstruction in nova far detector. |
from a cosmological perspective, scalar fields are well motivated dark matter and dark energy candidates. several possibilities of neutrino couplings with a time-varying cosmic field have been investigated in the literature. in this work, we present a framework in which violations of lorentz invariance (liv) and $cpt$ ... | neutrino lorentz invariance violation from cosmic fields |
neutrino oscillation experiments have provided compelling evidence for nonzero neutrino masses. the simplest and arguably most plausible explanation for the smallness of neutrino masses consists in adding to the particle spectrum of the standard model heavy right-handed neutrinos, with a majorana mass term that breaks ... | leptogenesis from heavy right-handed neutrino decay |
the india-based neutrino observatory (ino) is a proposed underground facility located in india that will primarily house the magnetised iron calorimeter (ical) detector to study atmospheric neutrinos produced by interactions of cosmic rays with earth's atmosphere. the physics goal is to to make precision measurements o... | india based neutrino observatory, physics reach and status report |
operating 40 km off the coast of france since 2007, the antares detector is the largest deep-sea neutrino telescope in the northern hemisphere with an instrumented volume of more than 0.01 cubic kilometers. it consists of an array of 885 photomultipliers detecting the cherenkov light induced by charged leptons produced... | recent results from antares |
the particle showers produced in the atmosphere due to the interactions of primary cosmic particles require a thorough understanding in the backdrop of searches for rare interactions. while the showers encompass the physics of strong, weak and electromagnetic interactions, the very first interactions are strong interac... | cosmogenic particles at ground level and their correlations with primary particles |
being the primary source of energy in the solar corona, the magnetic field plays a dominant role in driving solar eruptions and heating the coronal plasma. however, direct measurement of coronal magnetic field suffers from several limitations, and is extremely difficult to obtain. using observations from the coronal mu... | magnetoseismology for the solar corona: from10 gauss to coronal magnetograms |
solar probe plus (spp), currently in phase d, will be the first mission to fly into the low solar corona, revealing how the corona is heated and the solar wind and energetic particles are accelerated, solving fundamental mysteries that have been top priority science goals since such a mission was first proposed in 1958... | solar probe plus: a nasa mission to touch the sunmission status update |
in this work we present recent results from high-resolution direct numerical simulations and a phenomenological model that describes the radial evolution of reflection-driven alfven wave turbulence in the solar atmosphere and the inner solar wind. the simulations are performed inside a narrow magnetic flux tube that mo... | on the radial evolution of reflection-driven turbulence in the inner solar wind in preparation for parker solar probe |
low first ionisation potential (fip) elements show enriched abundances in the slow solar wind and coronal loops compared to photospheric values. turbulence is likely to be a key physical mechanism to explain these abundances. turbulent mixing is indeed essential to prevent gravitational settling of heavy elements. more... | fip fractionation in the turbulent solar chromosphere and corona: incompressible and compressible models |
the solar wind is a unique laboratory to study the turbulent processes occurring in a collisionless plasma with high reynolds numbers. a turbulent cascade is a process that transfers the free energy contained within large scale fluctuations into the smaller scales and it is considered as the most important mechanisms r... | power spectral density of magnetic field and ion velocity fluctuations from inertial to kinetic scales |
the white light images from the large-angle and spectrometric coronagraph (lasco) c2 and c3 have shown small-scale periodic plasmoid releases from the tip of the helmet streamers. the density and velocity of these blobs show similarities with the slow solar wind. there are various scenarios proposed to comprehend the r... | examining the release mechanism of intermittent streamer blobs |
the photosphere, transition region, and corona are host to a plethora of small, bright, transient phenomena, collectively known as bright points, or brightenings. given their ubiquity and frequency, bright points are likely an important signature of plasma heating and/or transport mechanisms. we present a novel and eff... | an automated method to detect, track and characterise bright points in multi-instrument solar imagery. |
the new vacuum solar telescope is the most important facility of the fuxian solar observatory in china. based on the high spatial and temporal resolution nvst observations, we investigate the solar activities in the chromosphere and obtain some new results. (1) observations of a flux rope tracked by filament activation... | solar activities observed with the new vacuum solar telescope |
context. magnetic bright points (mbps) are small, bright, and conspicuous magnetic structures observed in the solar photosphere and are widely recognized as tracers of magnetic flux tubes. previous studies have underscored the significance of mbps in elucidating the mechanisms of coronal heating. the continuous advance... | a deep learning approach for automated segmentation of magnetic bright points in the solar photosphere |
this paper poses the problem of studying the role of large-scale electric currents propagating in the upper layers of the solar atmosphere in processes of coronal heating of the sun. for detecting and calculating the magnitude of the large-scale electric current, data on the distribution of the components of the magnet... | large-scale electric currents in coronal heating processes above active regions on the sun |
magnetic switchbacks in the solar wind have been observed over a wide range of heliocentric distances in both the solar equatorial plane and at high latitudes. these structures consist of a perturbation or fold in the local magnetic field, leading to local inversion in the radial component of the field, as well as an e... | magnetic switchbacks from an observational perspective |
alfvén wave turbulence has emerged as an important heating mechanism to accelerate the solar wind. the generation of this turbulent heating is dependent on the presence and subsequent interaction of counter-propagating alfvén waves. this requires us to understand the propagation and evolution of alfvén waves in the sol... | flux tube dependent propagation of alfvén waves in the solar corona |
shocks ahead of coronal mass ejections (cmes) can accelerate solar wind plasma to high energies. ions heavier than protons can be used as tracers for the associated heating and acceleration mechanisms in the solar wind plasma. helium, as measured by the ace and wind satellites, is studied in a series of shocks associat... | multi-spacecraft measurements of heavy ions at interplanetary shocks in front of coronal mass ejections |
in this paper, we characterize transverse oscillations as either alfvénic or landau-type in an incompressible non-ideal magnetohydrodynamic (mhd) fluid. we consider shear viscosity and magnetic diffusivity as dissipation mechanisms to derive a general dispersion relation for the incompressible mhd waves. the solutions ... | transverse oscillations of the incompressible mhd mode in the visco-resistive plasmas: an explanation of alfvénic to landau-type characteristics |
over most perihelion segments of the parker solar probe (psp) orbit (inside about 20 solar radii) the integrated science investigation of the sun-energetic particle instrument-lo (isois/epi-lo) observed significant non-dispersive intensities of ~100-1500kev 4he, o, mg, si, and fe, both close to and distant from the hel... | near-continuous coronal heavy ion acceleration observed on parker solar probe at perihelion |
the acceleration of the solar wind, particularly from open flux tubes, remains an open question in solar physics. countless physical processes have been suggested to explain all or parts of the coupled problem of coronal heating and wind acceleration, but the current generation of observations have been so far unable t... | time-dependent modeling of solar wind acceleration from turbulent heating in open flux tubes |
observations and modeling shows that in the solar chromosphere the temperature rises from a minimum of below 4,000 k to over 6,000k. this rapid change occurs for reasons that remain a mystery but may prove essential to allowing energy to flow from the solar surface upward toward the corona. we will present the results ... | simulations reveal a new thermally-driven plasma instability in the solar chromosphere |
observations of active region (ar) coronae in different euv wavelengths reveal the presence of various loops at different temperatures. to understand the mechanisms that result in hotter or cooler loops, we study a typical bipolar ar, near solar disk center, which has moderate overall magnetic twist and at least one fu... | evidence of suppressed heating of coronal loops rooted in opposite polarity sunspot umbrae |
we aim to develop a diagnostic method for the coronal heating mechanism in active region loops. observational constraints on coronal heating models have been sought using measurements in the x-ray and euv wavelengths. statistical analysis, using euv emission from many active regions, was done by fludra and ireland (200... | diagnostics of coronal heating in solar active regions |
more than four decades have passed since a link between solar wind magnetic sector boundary structure and mid-latitude upper tropospheric vorticity was discovered (wilcox et al., science, 180, 185-186, 1973). the link has been later confirmed and various physical mechanisms proposed but apart from controversy, little a... | is tropospheric weather influenced by solar wind through atmospheric vertical coupling downward control? |
the characterization of planetary exospheres today, relies on the development of a highly efficient ionization source, due to the scant neutral molecules (n < 108 cm -3) present in diffuse planetary coronae. these tenuous atmospheres provide insight on to physical processes known to occur such as: space weathering, ... | towards a carbon nanotube ionization source for planetary atmosphere exploration |
impulsively generated, large-amplitude slow magnetoacoustic waves are often detected in active region coronal loops, associated with small non-eruptive solar flares. such a kind of loop oscillations were first discovered with the soho/sumer spectrometer, so often called "sumer" oscillations. recently, a similar phenome... | observation and modeling of standing and reflected propagating slow-mode waves in flaring coronal loops |
the solar chromosphere, the thin layer of the sun's lower atmosphere separating the photosphere from the corona, is the site of numerous complex physical processes. studying the structure and dynamics of chromospheric magnetic fields is a step toward understanding the heating mechanisms of the solar atmosphere and the ... | recombination and the hall effect in simulations of chromospheric magnetic reconnection |
more than 70 years of the space-borne solar exploration clearly shows that extreme ultraviolet (euv) wavelengths are very useful for observations of the solar transition region and corona. because of this, almost all of the current and future solar space missions have euv payloads. unfortunately, china has never sent a... | 太阳极紫外光谱探测的历史与展望', '太阳极紫外光谱探测的历史与展望', 'current status and future perspectives of solar spectroscopic observations at extreme ultraviolet wavelengths. |
investigating the differential emission measure (dem) of solar microflares provides an important constraint to understand complex magnetic energy releases and coronal heating mechanisms. the distribution of hot coronal plasma at higher temperatures (above 5 mk) during microflares is often loosely constrained, chiefly d... | constrained differential emission measure of microflare heating observed with foxsi-2, hinode/xrt and sdo/aia |
energy dissipation mechanism for weakly collisional or collisionless plasma is of principal importance for particle heating. depending on plasma conditions, different energy dissipation proxies emerge, including third-order law, j·e (the work done by the field on particles), -(p·∇)·u (pressure-strain interaction), etc.... | scale dependence of energy transfer in turbulent plasma |
recent observational, theoretical, and experimental work strongly suggest that the damping of alfvén waves is responsible for the heating of solar coronal holes. in order to experimentally investigate potential damping mechanisms, we have performed a series of experiments at the large plasmadevice (lapd) at the univers... | experimental investigation of alfvén wave propagation in an inhomogeneous plasma |
in this talk, i will show our recent results on 3d simulations of coronal loops driven with transverse waves at the footpoints. we find that the transverse waves convert to turbulence via the kelvin-helmholtz instability (for standing waves) or uniturbulence (for propagating waves). the latter is turbulence generated f... | driven transverse waves lead to turbulent coronal loops and heating |
black hole accretion disks in x-ray binaries (xrbs) phenomenologically display two different x-ray emission states: a soft state with a low-energy thermal peak and a subdominant non-thermal component, and a hard state with a broad spectrum peaking in hard x-rays. the latter is of great interest from a plasma physics pe... | ab-initio comptonization in reconnecting current sheets of x-ray binary coronae |
the physics behind the heating of the solar corona and the acceleration of the fast solar wind from coronal holes (predominantly open field regions of the solar corona) is not well understood. recent observations of large-amplitude counter-propagating alfvén waves at the base of coronal holes suggest that the outward a... | study of alfvén wave reflection to address the solar coronal heating problem |
euv observations of active region (ar) coronae reveal the presence of loops at different temperatures. to understand the mechanisms that result in hotter or cooler loops, we study a typical bipolar ar, near solar disk center, which has moderate overall magnetic twist and at least one fully developed sunspot of each pol... | suppression of heating of coronal loops rooted in opposite polarity sunspot umbrae |
we simulate the temperature profiles along coronal loops measured with aia dem tomography and field-line extrapolation by nuevo et al (2013). by varying the strength and nature of the heating mechanism, we modeled steady-state, gravitationally stable loops that have temperature profiles with local maxima below the loop... | explaining inverted temperature loops in the quiet solar corona with magnetohydrodynamic wave mode conversion |
the solar wind undergoes significant heating as it propagates away from the sun, however the exact mechanisms heating the plasma are not yet fully understood. identifying the physical mechanisms responsible for this heating is fundamentally important to describe the solar corona and solar wind. parker solar probe and s... | a new approach to study stochastic heating in the solar wind with implications for parker solar probe and solar orbiter |
quasi-periodic density fluctuations appear ubiquitous in the regions where the solar wind forms and accelerates. the origin of these fluctuations is still debated and could result from a number of physical processes including rising mhd waves, periodic impulsive heating or continual magnetic reconnection. the recent an... | transient coronal heating as a source of density fluctuations imaged by stereo and future space missions |
a long-standing problem in solar physics is the observation of anomalous heating in the solar corona and in solar flares. this heating is often heuristically attributed to magnetic reconnection, but the precise thermalization mechanism has not been identified. in various other reconnection situations such as the magnet... | stochastic heating as the ubiquitous fast ion heating mechanism in magnetic reconnection |
coronal heating mechanisms are notoriously difficult to constrain with current observations. we present new observations from an instrument designed to measure a critical diagnostic of the frequency heating events in active regions. the marshall grazing incidence x-ray spectrometer (magixs) is a sounding rocket mission... | preliminary results from the marshall grazing incidence x-ray spectrometer (magixs) |
turbulent cascade transferring the free energy contained within the large scale fluctuations of the magnetic field, velocity and density into the smaller ones is probably one of the most important mechanisms responsible for heating of the solar corona and solar wind and thus the turbulent behavior of these quantities i... | spectra of temperature fluctuations in the solar wind |
the solar wind is a unique laboratory to study the turbulent processes occurring in a collisionless plasma with high reynolds numbers. a turbulent cascade—the process that transfers the free energy contained within the large scale fluctuations into the smaller ones—is believed to be one of the most important mechanisms... | power spectral density of magnetic field and ion velocity fluctuations from inertial to kinetic ranges |
we investigate abundance variations of heavy ions in coronal loops. we develop and exploit a multi-species model of the solar atmosphere (called irap"s solar atmospheric model: isam) that solves for the transport of neutral and charged particles from the chromosphere to the corona. we investigate the effect of differen... | simulating the fip effect in coronal loops using a multi-species kinetic-fluid model |
the large-scale solar wind speed distribution varies in time in response to the cyclic variations of the strength and geometry of the magnetic field of the corona. semi-empirical predictive laws (such as in the widely-used wsa law) parametrise the asymptotic solar wind speed via simple parameters describing the geometr... | new stratagies for modelling and forecasting the background solar wind |
on 2 july 2019, a total solar eclipse was visible across south america. because the corona is a million times fainter than the photosphere, total solar eclipses provide vital opportunities to make coronal observations essential for providing insight into mechanisms behind coronal heating and the solar wind. an internat... | the south american total solar eclipse of 2 july 2019: an opportunity for undergraduate engagement in research |
the evolution of the solar wind from the corona to the earth and throughout the heliosphere is a complex interplay between local micro kinetics and large scale expansion effects. these processes in the solar wind need to be separated in order to understand and distinguish the dominant mechanism for heating and accelera... | understanding non-equilibrium collisional and expansion effects in the solar wind with parker solar probe |
space weather forecasting requires precise estimation of the arrival time of eruptive events, which typically propagate through and interact with the solar atmosphere and solar wind. therefore, the arrival time estimation depends on the accuracy of modelling the solar atmosphere and the complex interactions. for instan... | evaluations of numerical flux schemes of a coronal mhd model |
we present new results towards the explanation of the chromospheric-heating problem and the solar-wind origin, using a two-fluid model that takes into account the collisional interaction between ions (protons) and neutrals (hydrogen atoms). our aim is to further reveal the mechanism behind chromospheric heating and pla... | monochromatic two-fluid alfvén waves in the partially ionised solar chromosphere |
coronal holes are regions of the sun's atmosphere with open magnetic field lines that extend into interplanetary space. these regions are ≍ 200 times hotter than the underlying photosphere. recent observations of damping of alfvén waves in coronal holes suggest that a wave driven process may be responsible for the temp... | understanding the role of alfvén waves in heating solar coronal holes through laboratory experiments |
collisionless magnetic reconnection, which converts the magnetic energy into the kinetic energy of plasma particles via the heating or acceleration, has been believed widely to be able to explain various eruptive phenomena such as solar flares and geomagnetic storms. however, the microphysical mechanism of anomalous re... | chaos-induced resistivity in collisionless magnetic reconnection region |
the solar wind is a unique laboratory to study the turbulent processes occurring in a collisionless plasma with high reynolds numbers. a turbulent cascadethe process that transfers the free energy contained within the large scale fluctuations into the smaller onesis believed to be one of the most important mechanisms r... | variations of power spectral density of magnetic field and ion velocity fluctuations through the heliosphere |
the focus of many investigations on coronal wave heating has been to scrutinise the role of transverse (i.e. kink) modes; examining their damping by resonant absorption and the transfer of energy to alfvén modes. subsequently, the alfvén modes are then subject to phase mixing and this leads to plasma heating. more rece... | is phase mixing important in the quiet sun? |
the parker solar probe, launched in 2018, will reach a radial distance of about 9.8 rsun below the alfven surface, and has completed 7 orbits around the sun. one of the main objectives of the psp mission is to answer the outstanding questions about how the solar corona plasma is heated to millions of degrees kelvin, an... | turbulence transport modeling and parker solar probe (psp) measurements |
the student thermal energetic activity module (steam) will explore how solar coronal plasmas are heated in flares and active regions by measuring the abundances of elements with low first ionization potential (fip) using soft (0.5-10 kev) and hard (5-30 kev) x-rays to distinguish signatures of reconnection-based corona... | student thermal energetic activity module (steam) x-ray spectrometer on the punch small explorer |
the development of a detailed understanding of turbulence in magnetized plasmas has been a long standing goal of the broader scientific community, both as a fundamental physics process and because of its applicability to a wide variety of phenomena. turbulence in a magnetized plasma is the primary mechanism responsible... | <p>a full eulerian vlasov-maxwell study of turbulent dynamics and dissipation |
on the day-side of the earth magnetopause, the existence of magnetic reconnection has been proven by in-situ observations. interacting with the solar wind, the loop-like magnetic field on magnetopause breaks and releases energy to accelerate particles that result in magnetic substorms. in analogy with this process, dur... | 2.5d mhd simulation of the evolution of magnetic islands toward flare loops |
the multi-slit solar explorer (muse) is a proposed nasa midex mission, currently in phase a, composed of a multi-slit euv spectrograph (in three narrow spectral bands centered around 171å, 284å, and 108å) and an euv context imager (in two narrow passbands around 195å and 304å). muse will provide unprecedented spectral ... | probing the physics of coronal heating with the multi-slit solar explorer (muse) |
hard x-rays (hxrs) provide a key diagnostic for energy release during a solar flare, as hxrs are emitted from flare-accelerated electrons and strongly heated flare plasma. in the case of a solar eruptive event, a flare is associated with the eruption of a coronal mass ejection (cme); though it is largely understood tha... | investigating energy release during solar eruptive events with rhessi, stereo, and sdo |
two competing fundamental hypotheses are usually postulated in the solar coronal heating problem: heating by nanoflares and heating by waves. in the latter it is assumed that acoustic and magnetohydrodynamic disturbances whose amplitude grows as they propagate in a medium with a decreasing density come from the convect... | on an efficient shock wave generation mechanism in the quiet solar transition region |
drift waves are generally known to be present abundantly in plasmas which feature density gradients. in fusion devices, the drift wave mode triggers turbulence generally hindering the device's capability; in the earth's magnetosphere, the drift wave mode is most frequently present as the lower hybrid drift instability ... | the role of drift waves in solar plasma |
we present numerical results from high-resolution fully kinetic simulations of plasma turbulence under the near-sun conditions encountered by parker solar probe during its first perihelion, characterized by a low plasma beta and a large level of turbulent fluctuations. the recovered spectral properties are in agreement... | fully kinetic simulations of electron-scale plasma turbulence in the inner heliosphere: a pathfinder for future spacecraft missions |
collisionless plasmas in space often evolve into turbulence by exciting an ensemble of broadband electromagnetic and plasma fluctuations. such dynamics are observed to operate in various space plasmas such as in the solar corona, the solar wind, as well as in the earth and planetary magnetospheres. though nonlinear in ... | the gary picture of short-wavelength plasma turbulence—the legacy of peter gary |
coronal heating remains one of the main unsolved problems in the solar physics. to identify the physical mechanisms responsible for heating the coronal plasma, we need to clarify where and how this heating occurs, and how the heating process is related to local and global properties of the magnetic field and plasma. th... | diagnosing coronal heating in solar active regions with multiwavelength radio observations |
physical quantities, such as ion temperature and non-thermal velocity, provide critical information about the heating mechanism of the million-degree solar corona. we provide new constraints to ion temperatures using euv line widths, only assuming that the plasma non-thermal velocity is the same for all ions. we measur... | estimating ion temperatures at the polar coronal hole boundary |
solar flares result in an increase of the solar irradiance at all wavelengths. while the distribution of the flare fluence observed in coronal emission has been widely studied and found to scale as f(e) ~ e^{-\alpha}, with \alpha slightly below 2, the distribution of the flare fluence in chromospheric lines is poorly k... | on the variation of the scaling exponent of the flare fluence with temperature |
we suggest a novel mechanism of a coronal mass ejection based on the electron weibel instability [1] of an anisotropic distribution of hot (up to multi-kev) electrons in the presence of an external magnetic field. namely, we show that, under certain conditions in the solar or stellar coronal arches, the weibel-type ins... | weibel-instability mechanism of a coronal mass ejection: analytical results for the growth rate and pic-modeling of the nonlinear stage in the presence of an external magnetic field |
george fisher has worked in solar physics and astronomy for over 40 years. he will review contributions made by him and his collaborators to understanding the dynamics of the atmosphere during solar and stellar flares. he will then describe research on the dynamics of magnetic fields in the solar interior, using thin f... | understanding the dynamics of magnetic field and plasma in the interior and atmosphere of the sun |
we present the spatially resolved absolute brightness of fe x, fe xi and fe xiv coronal emission lines observed during the 2019 july 2 total solar eclipse between 1.08 and 3.0 rsun. the topology is that of a classic solar minimum corona, with a dipole field dominance showcased by large polar coronal holes and two wide ... | inferences of the absolute brightness of fe x, xi and xiv, and the electron temperature from the 2019 total solar eclipse |
gravity induced resonant emission (gire) has been proposed as the mechanism of coronal heating; here we are comparing this with multi photon ionisation (mpi) in laser. we find both are same, except electron damping as a pre-phase mechanism to initiate mpi in gire. a high intensity laser field used for mpi, but in gire,... | multi photon absorption in gravity induced resonant emission |
the student thermal energetic activity module (steam) is a student-built and operated instrument aboard the punch/nfi spacecraft. expected to launch in mid-2025 with a 2-year prime mission, steam will observe near the maximum of solar cycle 25. steam aims to increase understanding of coronal plasma heating mechanisms u... | steam - understanding origins of coronal plasma through elemental abundances in x-ray spectra |
plasma-neutral coupling (pnc) in the solar atmosphere concerns the effects of collisions between charged and neutral species’. it is most important in the chromosphere, which is the weakly ionized, strongly magnetized region between the weakly ionized, weakly magnetized photosphere and the strongly ionized, strongly ma... | basic properties of plasma-neutral coupling in the solar atmosphere |
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