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Solar activity report
Report of Solar-Geophysical Activity 2024 Apr 26 0015 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 116 Issued at 2200Z on 25 Apr 2024IA. Analysis of Solar Active Regions and Activity from 24-2100Z to 25-2100Z
Solar activity has been at moderate levels for the past 24
hours. The largest solar event of the period was an M1.1 event observed
at 25/1712Z from Region 3638 (S18, L=231). There are currently 13
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
(26 Apr, 27 Apr, 28 Apr).
IIA. Geophysical Activity Summary 24-2100Z to 25-2100Z
The geomagnetic
field has been at quiet levels for the past 24 hours. Solar wind speed
reached a peak of 350 km/s at 25/1357Z. Total IMF reached 6 nT at
25/1407Z. The maximum southward component of Bz reached -4 nT at
25/08414Z. Electrons greater than 2 MeV at geosynchronous orbit reached
a peak level of 1670 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at unsettled to active levels on day one (26 Apr) and quiet to
active levels on days two and three (27 Apr, 28 Apr). Protons have a
slight chance of crossing threshold on days one, two, and three (26 Apr,
27 Apr, 28 Apr).
III. Event Probabilities 26 Apr to 27 Apr
| Class M | 75% | 75% | 75% |
| Class X | 15% | 15% | 15% |
| Proton | 15% | 15% | 15% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 25 Apr 167 Predicted 26 Apr-28 Apr 155/145/135 90 Day Mean 25 Apr 163
V. Geomagnetic A Indices
Observed Afr/Ap 24 Apr 003/003 Estimated Afr/Ap 25 Apr 003/003 Predicted Afr/Ap 26 Apr-28 Apr 016/015-015/015-011/012
VI. Geomagnetic Activity Probabilities 26 Apr to 28 Apr
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 35% | 35% | 35% |
| Minor storm | 25% | 20% | 20% |
| Major-severe storm | 05% | 05% | 05% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 10% | 10% | 10% |
| Minor storm | 25% | 30% | 30% |
| Major-severe storm | 60% | 55% | 55% |
All times in UTC
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| Last X-flare | 2025/03/28 | X1.1 |
| Last M-flare | 2025/03/30 | M1.5 |
| Last geomagnetic storm | 2025/03/27 | Kp5 (G1) |
| Spotless days | |
|---|---|
| Last spotless day | 2022/06/08 |
| Monthly mean Sunspot Number | |
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| February 2025 | 154.6 +17.6 |
| March 2025 | 127.5 -27.1 |
| Last 30 days | 127.5 -24.7 |