Viewing archive of Thursday, 28 May 2026
Solar activity report
Report of Solar-Geophysical Activity 2026 May 28 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 148 Issued at 2200Z on 28 May 2026IA. Analysis of Solar Active Regions and Activity from 27-2100Z to 28-2100Z 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 (29 May, 30 May,
31 May).
IIA. Geophysical Activity Summary 27-2100Z to 28-2100Z
The geomagnetic
field has been at quiet to active levels for the past 24 hours. Solar
wind speed reached a peak of 491 km/s at 28/2048Z. Total IMF reached 9
nT at 28/1024Z. The maximum southward component of Bz reached -8 nT at
28/0542Z. Electrons greater than 2 MeV at geosynchronous orbit reached
a peak level of 561 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to unsettled levels on days one and two (29 May, 30 May)
and quiet to active levels on day three (31 May).
III. Event Probabilities 29 May to 31 May
| Class M | 40% | 40% | 40% |
| Class X | 05% | 05% | 05% |
| Proton | 05% | 05% | 05% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 28 May 145 Predicted 29 May-31 May 142/145/142 90 Day Mean 28 May 125
V. Geomagnetic A Indices
Observed Afr/Ap 27 May 012/011 Estimated Afr/Ap 28 May 010/011 Predicted Afr/Ap 29 May-31 May 011/012-008/010-011/015
VI. Geomagnetic Activity Probabilities 29 May to 31 May
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 20% | 15% | 30% |
| Minor storm | 05% | 05% | 10% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 20% | 20% | 20% |
| Minor storm | 25% | 30% | 35% |
| Major-severe storm | 25% | 20% | 35% |
All times in UTC
Latest news
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Latest forum messages
Incoming & Unnumbered Active Regions 440Forum messages 18AR4455 24AR4446 (including AR4448/4449) 46Unspecified geomagnetic activity 283
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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 | 97.9 +18.6 |
| Last 30 days | 97.9 +5 |
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