Update Dst index: 588,806 hourly readings

README.md

@@ -57,17 +57,17 @@ This dataset is suitable for **time-series forecasting, tabular regression** tas
 |--------|------|-------------|--------|--------|
 | `datetime` | datetime64[us] | Hour-averaged timestamp (UTC); Dst has been reported at 1-hour cadence since 1957 | 1957-01-01 00:00:00 | 0.0% |
 | `dst_nt` | float64 | Disturbance Storm Time index in nT -- measures ring current injection at mid-latitudes; negative values indicate ring current enhancement; quiet: -20 to 0 nT, minor storm: -30 to -50 nT, moderate: -50 to -100 nT, intense: < -100 nT, extreme: < -250 nT | 11.0 | 0.0% |
-| `daily_mean_nt` | float64 | 24-hour mean Dst (nT) for the calendar day containing this record; smooths over short-duration spikes to represent overall storm level | -30.0 | 67.4% |
+| `daily_mean_nt` | float64 | 24-hour mean Dst (nT) for the calendar day containing this record; smooths over short-duration spikes to represent overall storm level | -30.0 | 67.7% |
 | `quality` | str | Data quality flag: 'final' (definitive WDC-processed values), 'provisional' (recent months, pending full processing), or 'realtime' (near-real-time, subject to revision) | final | 0.0% |
 | `is_storm` | bool | True if Dst <= -50 nT, the conventional threshold for a geomagnetic storm | False | 0.0% |
 | `storm_intensity` | category | Derived storm severity: 'quiet' (> -50 nT), 'weak' (-50 to -100 nT), 'moderate' (-100 to -250 nT), 'intense' (-250 to -500 nT), 'super' (< -500 nT, extremely rare; Carrington 1859 estimated at -850 nT) | quiet | 0.0% |
 
 ## Quick stats
 
-- **590,990** hourly readings (1957-01-01 to 2026-08-23)
-- **25,875** storm hours (Dst <= -50 nT)
+- **588,806** hourly readings (1957-01-01 to 2026-08-24)
+- **25,811** storm hours (Dst <= -50 nT)
 - Deepest storm: **-406.0 nT** on 2024-05-11 02:00
-- Data quality: 547,368 final, 40,872 provisional, 2,750 realtime
+- Data quality: 547,368 final, 40,872 provisional, 566 realtime
 
 ## Usage
 

data/dst_index.parquet

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
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-size 4447099
+oid sha256:83a33cb29343a62b8f4709f7c055b84e603a50f95a29e2d5415247ae7b62f1c1
+size 4431468