Viewing archive of Sunday, 27 July 2025
Solar activity report
Report of Solar-Geophysical Activity 2025 Jul 27 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 208 Issued at 2200Z on 27 Jul 2025IA. Analysis of Solar Active Regions and Activity from 26-2100Z to 27-2100Z Solar activity has been at low levels for the past 24 hours.
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 (28 Jul, 29 Jul,
30 Jul).
IIA. Geophysical Activity Summary 26-2100Z to 27-2100Z
The geomagnetic
field has been at quiet levels for the past 24 hours. Solar wind speed
reached a peak of 529 km/s at 27/0347Z. Total IMF reached 11 nT at
27/0033Z. The maximum southward component of Bz reached 0 nT at
27/1731Z. Electrons greater than 2 MeV at geosynchronous orbit reached
a peak level of 1686 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to unsettled levels on days one, two, and three (28 Jul,
29 Jul, 30 Jul).
III. Event Probabilities 28 Jul to 30 Jul
| Class M | 30% | 30% | 30% |
| Class X | 05% | 05% | 05% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 27 Jul 145 Predicted 28 Jul-30 Jul 145/145/140 90 Day Mean 27 Jul 135
V. Geomagnetic A Indices
Observed Afr/Ap 26 Jul 011/012 Estimated Afr/Ap 27 Jul 007/009 Predicted Afr/Ap 28 Jul-30 Jul 010/010-006/008-008/010
VI. Geomagnetic Activity Probabilities 28 Jul to 30 Jul
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 25% | 15% | 25% |
| Minor storm | 10% | 05% | 10% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 25% | 25% | 30% |
| Major-severe storm | 35% | 25% | 35% |
All times in UTC
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Space weather facts
| Last X-flare | 2025/12/08 | X1.1 |
| Last M-flare | 2025/12/08 | M2.0 |
| 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 | 162.7 +70.9 |
| Last 30 days | 108 +13.3 |