Viewing archive of Saturday, 26 July 2025
Solar activity report
Report of Solar-Geophysical Activity 2025 Jul 26 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 207 Issued at 2200Z on 26 Jul 2025IA. Analysis of Solar Active Regions and Activity from 25-2100Z to 26-2100Z Solar activity has been at low levels for the past 24 hours.
There are currently 10 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 (27 Jul, 28 Jul,
29 Jul).
IIA. Geophysical Activity Summary 25-2100Z to 26-2100Z
The geomagnetic
field has been at quiet to active levels for the past 24 hours. Solar
wind speed reached a peak of 629 km/s at 25/2144Z. Total IMF reached 11
nT at 26/1052Z. The maximum southward component of Bz reached -9 nT at
26/1157Z. Electrons greater than 2 MeV at geosynchronous orbit reached
a peak level of 2510 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to minor storm levels on day one (27 Jul), quiet to
unsettled levels on day two (28 Jul) and quiet levels on day three (29
Jul).
III. Event Probabilities 27 Jul to 29 Jul
| Class M | 40% | 40% | 40% |
| Class X | 05% | 05% | 05% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 26 Jul 143 Predicted 27 Jul-29 Jul 145/145/140 90 Day Mean 26 Jul 135
V. Geomagnetic A Indices
Observed Afr/Ap 25 Jul 010/008 Estimated Afr/Ap 26 Jul 010/011 Predicted Afr/Ap 27 Jul-29 Jul 014/020-011/012-006/005
VI. Geomagnetic Activity Probabilities 27 Jul to 29 Jul
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 35% | 35% | 10% |
| Minor storm | 30% | 15% | 01% |
| Major-severe storm | 10% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 10% | 10% | 20% |
| Minor storm | 20% | 25% | 20% |
| Major-severe storm | 65% | 50% | 10% |
All times in UTC
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Space weather facts
| Last X-flare | 2025/12/01 | X1.9 |
| Last M-flare | 2025/12/06 | M8.1 |
| Last geomagnetic storm | 2025/12/04 | Kp5 (G1) |
| Spotless days | |
|---|---|
| Last spotless day | 2022/06/08 |
| Monthly mean Sunspot Number | |
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| November 2025 | 91.8 -22.8 |
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| Last 30 days | 107.1 +13.7 |