Viewing archive of Tuesday, 26 May 2026
Solar activity report
Report of Solar-Geophysical Activity 2026 May 26 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 146 Issued at 2200Z on 26 May 2026IA. 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 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 (27 May, 28 May,
29 May).
IIA. Geophysical Activity Summary 25-2100Z to 26-2100Z
The geomagnetic
field has been at quiet to unsettled levels for the past 24 hours. Solar
wind speed reached a peak of 459 km/s at 26/1918Z. Total IMF reached 9
nT at 26/1838Z. The maximum southward component of Bz reached -7 nT at
26/2021Z. Protons greater than 10 MeV at geosynchronous orbit reached a
peak level of 23 pfu at 26/0110Z. Electrons greater than 2 MeV at
geosynchronous orbit reached a peak level of 455 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to active levels on days one and two (27 May, 28 May) and
quiet levels on day three (29 May). Protons greater than 10 Mev have a
slight chance of crossing threshold on day one (27 May).
III. Event Probabilities 27 May to 29 May
| Class M | 40% | 40% | 40% |
| Class X | 05% | 05% | 05% |
| Proton | 10% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 26 May 141 Predicted 27 May-29 May 145/150/145 90 Day Mean 26 May 125
V. Geomagnetic A Indices
Observed Afr/Ap 25 May 008/008 Estimated Afr/Ap 26 May 006/006 Predicted Afr/Ap 27 May-29 May 009/012-010/012-006/008
VI. Geomagnetic Activity Probabilities 27 May to 29 May
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 25% | 25% | 20% |
| Minor storm | 10% | 10% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 20% | 20% | 20% |
| Minor storm | 35% | 35% | 25% |
| Major-severe storm | 30% | 30% | 25% |
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 | 97.9 +18.6 |
| Last 30 days | 97.9 +5 |
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