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Solar activity report
Report of Solar-Geophysical Activity 2024 May 21 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 142 Issued at 2200Z on 21 May 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
21/1931Z from Region 3679 (S09W46). There are currently 9 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 May, 23 May, 24 May).
IIA. Geophysical Activity Summary 20-2100Z to 21-2100Z
The geomagnetic
field has been at quiet to unsettled levels for the past 24 hours. Solar
wind speed reached a peak of 467 km/s at 21/1847Z. Total IMF reached 7
nT at 21/1836Z. The maximum southward component of Bz reached -6 nT at
21/1355Z. Electrons greater than 2 MeV at geosynchronous orbit reached
a peak level of 764 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to unsettled levels on days one and two (22 May, 23 May)
and unsettled to active levels on day three (24 May). Protons have a
slight chance of crossing threshold on days one, two, and three (22 May,
23 May, 24 May).
III. Event Probabilities 22 May to 24 May
| Class M | 55% | 55% | 55% |
| Class X | 10% | 10% | 10% |
| Proton | 10% | 10% | 10% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 21 May 191 Predicted 22 May-24 May 190/192/192 90 Day Mean 21 May 169
V. Geomagnetic A Indices
Observed Afr/Ap 20 May 010/008 Estimated Afr/Ap 21 May 009/010 Predicted Afr/Ap 22 May-24 May 007/008-008/008-011/014
VI. Geomagnetic Activity Probabilities 22 May to 24 May
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 25% | 15% | 30% |
| Minor storm | 05% | 05% | 10% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 20% | 15% | 15% |
| Minor storm | 30% | 25% | 25% |
| Major-severe storm | 30% | 25% | 40% |
All times in UTC
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Space weather facts
| Last X-flare | 2024/11/06 | X2.39 |
| Last M-flare | 2024/11/20 | M1.1 |
| Last geomagnetic storm | 2024/11/10 | Kp5+ (G1) |
| Spotless days | |
|---|---|
| Last spotless day | 2022/06/08 |
| Monthly mean Sunspot Number | |
|---|---|
| October 2024 | 166.4 +25 |
| November 2024 | 142.7 -23.8 |
| Last 30 days | 155.2 +4.4 |