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Solar activity report
Report of Solar-Geophysical Activity 2024 Jul 21 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 203 Issued at 2200Z on 21 Jul 2024IA. Analysis of Solar Active Regions and Activity from 20-2100Z to 21-2100Z
Solar activity has been at moderate levels for the past 24
hours. The largest solar event of the period was a M1 event observed at
21/0834Z from Region 3751 (S08W28). There are currently 12 numbered
sunspot regions on the disk.
IB. Solar Activity Forecast
Solar activity is likely to be moderate
with a slight chance for an X-class flare on days one, two, and three
(22 Jul, 23 Jul, 24 Jul).
IIA. Geophysical Activity Summary 20-2100Z to 21-2100Z
The geomagnetic
field has been at quiet levels for the past 24 hours. Solar wind speed
reached a peak of 353 km/s at 21/1434Z. Total IMF reached 5 nT at
21/1537Z. The maximum southward component of Bz reached -4 nT at
21/1613Z. Electrons greater than 2 MeV at geosynchronous orbit reached
a peak level of 125 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to unsettled levels on day one (22 Jul) and quiet levels
on days two and three (23 Jul, 24 Jul). Protons have a slight chance of
crossing threshold on days one, two, and three (22 Jul, 23 Jul, 24 Jul).
III. Event Probabilities 22 Jul to 24 Jul
| Class M | 60% | 60% | 60% |
| Class X | 15% | 15% | 15% |
| Proton | 15% | 15% | 15% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 21 Jul 198 Predicted 22 Jul-24 Jul 195/190/190 90 Day Mean 21 Jul 187
V. Geomagnetic A Indices
Observed Afr/Ap 20 Jul 008/007 Estimated Afr/Ap 21 Jul 005/005 Predicted Afr/Ap 22 Jul-24 Jul 008/005-006/005-006/005
VI. Geomagnetic Activity Probabilities 22 Jul to 24 Jul
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 20% | 10% | 10% |
| Minor storm | 05% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 25% | 20% | 20% |
| Major-severe storm | 25% | 15% | 15% |
All times in UTC
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Space weather facts
| Last X-flare | 2025/05/14 | X2.7 |
| Last M-flare | 2025/05/19 | M3.1 |
| Last geomagnetic storm | 2025/05/17 | Kp6+ (G2) |
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| Last spotless day | 2022/06/08 |
| Monthly mean Sunspot Number | |
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| Last 30 days | 91.2 -24.1 |