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Solar activity report
Report of Solar-Geophysical Activity 2026 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 2026IA. 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 11 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 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 445 km/s at 26/2100Z. Total IMF reached 7
nT at 26/2122Z. The maximum southward component of Bz reached -7 nT at
26/2124Z. Electrons greater than 2 MeV at geosynchronous orbit reached
a peak level of 403 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to active levels on day one (28 May), quiet to unsettled
levels on day two (29 May) and quiet levels on day three (30 May).
III. Event Probabilities 28 May to 30 May
| Class M | 40% | 40% | 40% |
| Class X | 05% | 05% | 05% |
| Proton | 05% | 05% | 05% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 27 May 142 Predicted 28 May-30 May 145/142/145 90 Day Mean 27 May 125
V. Geomagnetic A Indices
Observed Afr/Ap 26 May 007/008 Estimated Afr/Ap 27 May 009/011 Predicted Afr/Ap 28 May-30 May 010/012-009/010-006/006
VI. Geomagnetic Activity Probabilities 28 May to 30 May
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 30% | 20% | 15% |
| Minor storm | 10% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 20% | 20% | 20% |
| Minor storm | 35% | 25% | 30% |
| Major-severe storm | 35% | 25% | 20% |
All times in UTC
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Latest forum messages
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Space weather facts
| Last X-flare | 2026/04/24 | X2.5 |
| Last M-flare | 2026/05/29 | M1.1 |
| Last geomagnetic storm | 2026/05/16 | Kp6- (G2) |
| Spotless days | |
|---|---|
| Last 365 days | 3 days |
| 2026 | 3 days (2%) |
| Last spotless day | 2026/02/24 |
| Monthly mean Sunspot Number | |
|---|---|
| April 2026 | 79.3 -6.6 |
| May 2026 | 99.1 +19.8 |
| Last 30 days | 99.1 +7.5 |
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