Viewing archive of Friday, 29 August 2025
Solar activity report
Report of Solar-Geophysical Activity 2025 Aug 29 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 241 Issued at 2200Z on 29 Aug 2025IA. Analysis of Solar Active Regions and Activity from 28-2100Z to 29-2100Z Solar activity has been at moderate levels for the past 24
hours. There are currently 11 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
(30 Aug, 31 Aug, 01 Sep).
IIA. Geophysical Activity Summary 28-2100Z to 29-2100Z
The geomagnetic
field has been at quiet levels for the past 24 hours. Solar wind speed
reached a peak of 445 km/s at 29/0500Z. Total IMF reached 6 nT at
29/1741Z. The maximum southward component of Bz reached -5 nT at
29/0227Z. Protons greater than 10 MeV at geosynchronous orbit reached a
peak level of 4 pfu at 29/0500Z. Electrons greater than 2 MeV at
geosynchronous orbit reached a peak level of 368 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet levels on day one (30 Aug) and quiet to unsettled levels
on days two and three (31 Aug, 01 Sep). Protons have a slight chance of
crossing threshold on day one (30 Aug), have a slight chance of crossing
threshold on day two (31 Aug) and have a slight chance of crossing
threshold on day three (01 Sep).
III. Event Probabilities 30 Aug to 01 Sep
| Class M | 75% | 75% | 75% |
| Class X | 20% | 20% | 20% |
| Proton | 20% | 15% | 10% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 29 Aug 222 Predicted 30 Aug-01 Sep 225/230/220 90 Day Mean 29 Aug 140
V. Geomagnetic A Indices
Observed Afr/Ap 28 Aug 007/007 Estimated Afr/Ap 29 Aug 005/005 Predicted Afr/Ap 30 Aug-01 Sep 006/005-007/010-008/008
VI. Geomagnetic Activity Probabilities 30 Aug to 01 Sep
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 10% | 20% | 20% |
| Minor storm | 01% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 20% | 30% | 30% |
| Major-severe storm | 20% | 30% | 25% |
All times in UTC
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Space weather facts
| Last X-flare | 2025/12/08 | X1.1 |
| Last M-flare | 2025/12/10 | M4.4 |
| Last geomagnetic storm | 2025/12/04 | Kp5 (G1) |
| Spotless days | |
|---|---|
| Last spotless day | 2022/06/08 |
| Monthly mean Sunspot Number | |
|---|---|
| November 2025 | 91.8 -22.8 |
| December 2025 | 157.7 +65.9 |
| Last 30 days | 108.1 +9.9 |