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Solar activity report
Report of Solar-Geophysical Activity 2024 Apr 20 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 111 Issued at 2200Z on 20 Apr 2024IA. Analysis of Solar Active Regions and Activity from 19-2100Z to 20-2100Z Solar activity has been at low levels for the past 24 hours.
The largest solar event of the period was a C7 event observed at
20/1706Z from Region 3645 (S09W20). There are currently 14 numbered
sunspot regions on the disk.
IB. Solar Activity Forecast
Solar activity is expected to be moderate
with a slight chance for an X-class flare on days one, two, and three
(21 Apr, 22 Apr, 23 Apr).
IIA. Geophysical Activity Summary 19-2100Z to 20-2100Z
The geomagnetic
field has been at quiet to active levels for the past 24 hours. Solar
wind speed reached a peak of 532 km/s at 20/0553Z. Total IMF reached 10
nT at 19/2100Z. The maximum southward component of Bz reached -8 nT at
19/2120Z. Electrons greater than 2 MeV at geosynchronous orbit reached
a peak level of 118 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to active levels on days one and three (21 Apr, 23 Apr)
and quiet to unsettled levels on day two (22 Apr). Protons have a slight
chance of crossing threshold on days one, two, and three (21 Apr, 22
Apr, 23 Apr).
III. Event Probabilities 21 Apr to 23 Apr
| Class M | 75% | 75% | 75% |
| Class X | 20% | 20% | 20% |
| Proton | 20% | 20% | 20% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 20 Apr 210 Predicted 21 Apr-23 Apr 210/205/200 90 Day Mean 20 Apr 161
V. Geomagnetic A Indices
Observed Afr/Ap 19 Apr 021/046 Estimated Afr/Ap 20 Apr 007/009 Predicted Afr/Ap 21 Apr-23 Apr 011/012-008/008-011/015
VI. Geomagnetic Activity Probabilities 21 Apr to 23 Apr
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 35% | 20% | 35% |
| Minor storm | 15% | 05% | 20% |
| Major-severe storm | 01% | 01% | 05% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 10% |
| Minor storm | 30% | 25% | 25% |
| Major-severe storm | 50% | 25% | 50% |
All times in UTC
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Space weather facts
| Last X-flare | 2024/05/15 | X2.9 |
| Last M-flare | 2024/05/17 | M7.1 |
| Last geomagnetic storm | 2024/05/17 | Kp6 (G2) |
| Spotless days | |
|---|---|
| Last spotless day | 2022/06/08 |
| Monthly mean Sunspot Number | |
|---|---|
| April 2024 | 136.5 +31.6 |
| May 2024 | 157.7 +21.2 |
| Last 30 days | 171.7 +57.7 |