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Solar activity report
Report of Solar-Geophysical Activity 2024 Mar 21 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 81 Issued at 2200Z on 21 Mar 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
20/2255Z from Region 3615 (S12E39). There are currently 9 numbered
sunspot regions on the disk.
IB. Solar Activity Forecast
Solar activity is expected to be low with
a chance for M-class flares on days one, two, and three (22 Mar, 23 Mar,
24 Mar).
IIA. Geophysical Activity Summary 20-2100Z to 21-2100Z
The geomagnetic
field has been at quiet to minor storm levels for the past 24 hours.
Solar wind speed reached a peak of 397 km/s at 21/1517Z. Total IMF
reached 14 nT at 21/0241Z. The maximum southward component of Bz reached
-12 nT at 21/1243Z. Electrons greater than 2 MeV at geosynchronous
orbit reached a peak level of 106 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to minor storm levels on day one (22 Mar), quiet levels
on day two (23 Mar) and quiet to active levels on day three (24 Mar).
III. Event Probabilities 22 Mar to 24 Mar
| Class M | 45% | 45% | 45% |
| Class X | 05% | 05% | 05% |
| Proton | 05% | 05% | 05% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 21 Mar 197 Predicted 22 Mar-24 Mar 180/178/174 90 Day Mean 21 Mar 162
V. Geomagnetic A Indices
Observed Afr/Ap 20 Mar 003/005 Estimated Afr/Ap 21 Mar 019/026 Predicted Afr/Ap 22 Mar-24 Mar 012/015-005/005-011/016
VI. Geomagnetic Activity Probabilities 22 Mar to 24 Mar
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 45% | 05% | 35% |
| Minor storm | 25% | 01% | 15% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 10% | 15% | 15% |
| Minor storm | 25% | 20% | 30% |
| Major-severe storm | 65% | 10% | 45% |
All times in UTC
Latest news
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Space weather facts
| Last X-flare | 2026/03/30 | X1.5 |
| Last M-flare | 2026/04/04 | M1.0 |
| Last geomagnetic storm | 2026/04/03 | Kp7- (G3) |
| Spotless days | |
|---|---|
| Last 365 days | 3 days |
| 2026 | 3 days (3%) |
| Last spotless day | 2026/02/24 |
| Monthly mean Sunspot Number | |
|---|---|
| March 2026 | 85.9 +7.7 |
| April 2026 | 118.8 +32.8 |
| Last 30 days | 102.1 +47 |
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