Viewing archive of Tuesday, 27 May 2025
Solar activity report
Report of Solar-Geophysical Activity 2025 May 27 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 147 Issued at 2200Z on 27 May 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 8 numbered sunspot regions on the disk.
IB. Solar Activity Forecast
Solar activity is likely to be moderate
with a slight chance for an X-class flare on days one, two, and three
(28 May, 29 May, 30 May).
IIA. Geophysical Activity Summary 26-2100Z to 27-2100Z
The geomagnetic
field has been at quiet to active levels for the past 24 hours. Solar
wind speed reached a peak of 517 km/s at 27/2015Z. Total IMF reached 13
nT at 27/1919Z. The maximum southward component of Bz reached -8 nT at
27/2043Z. Electrons greater than 2 MeV at geosynchronous orbit reached
a peak level of 461 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to minor storm levels on day one (28 May) and quiet to
active levels on days two and three (29 May, 30 May). Protons have a
slight chance of crossing threshold on days one, two, and three (28 May,
29 May, 30 May).
III. Event Probabilities 28 May to 30 May
| Class M | 55% | 55% | 55% |
| Class X | 15% | 15% | 15% |
| Proton | 10% | 10% | 10% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 27 May 137 Predicted 28 May-30 May 133/130/130 90 Day Mean 27 May 154
V. Geomagnetic A Indices
Observed Afr/Ap 26 May 008/ 008 Estimated Afr/Ap 27 May 013/015 Predicted Afr/Ap 28 May-30 May 018/025-015/016-009/012
VI. Geomagnetic Activity Probabilities 28 May to 30 May
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 40% | 35% | 30% |
| Minor storm | 30% | 15% | 10% |
| Major-severe storm | 05% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 10% | 10% | 15% |
| Minor storm | 25% | 30% | 30% |
| Major-severe storm | 65% | 50% | 40% |
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 | M1.8 |
| 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 |