Viewing archive of Wednesday, 20 May 2026
Solar activity report
Report of Solar-Geophysical Activity 2026 May 20 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 140 Issued at 2200Z on 20 May 2026IA. Analysis of Solar Active Regions and Activity from 19-2100Z to 20-2100Z Solar activity has been at low levels for the past 24 hours.
There are currently 4 numbered sunspot regions on the disk.
IB. Solar Activity Forecast
Solar activity is expected to be low with
a slight chance for an M-class flare on day one (21 May) and expected to
be low with a chance for M-class flares on days two and three (22 May,
23 May).
IIA. Geophysical Activity Summary 19-2100Z to 20-2100Z
The geomagnetic
field has been at quiet to unsettled levels for the past 24 hours. Solar
wind speed reached a peak of 542 km/s at 20/0222Z. Total IMF reached 6
nT at 20/0158Z. The maximum southward component of Bz reached -5 nT at
19/2359Z. Electrons greater than 2 MeV at geosynchronous orbit reached
a peak level of 1716 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to unsettled levels on day one (21 May), quiet to active
levels on day two (22 May) and quiet levels on day three (23 May).
III. Event Probabilities 21 May to 23 May
| Class M | 20% | 25% | 25% |
| Class X | 05% | 05% | 05% |
| Proton | 05% | 05% | 05% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 20 May 114 Predicted 21 May-23 May 110/108/115 90 Day Mean 20 May 124
V. Geomagnetic A Indices
Observed Afr/Ap 19 May 018/019 Estimated Afr/Ap 20 May 008/008 Predicted Afr/Ap 21 May-23 May 007/012-007/009-007/008
VI. Geomagnetic Activity Probabilities 21 May to 23 May
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 20% | 30% | 20% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 20% | 20% | 20% |
| Minor storm | 35% | 35% | 35% |
| Major-severe storm | 25% | 30% | 25% |
All times in UTC
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Space weather facts
| Last X-flare | 2026/07/04 | X1.3 |
| Last M-flare | 2026/07/12 | M1.19 |
| Last geomagnetic storm | 2026/07/04 | Kp7+ (G3) |
| Spotless days | |
|---|---|
| Last 365 days | 3 days |
| 2026 | 3 days (2%) |
| Last spotless day | 2026/02/24 |
| Monthly mean Sunspot Number | |
|---|---|
| June 2026 | 94.4 -7.1 |
| July 2026 | 74.8 -19.6 |
| Last 30 days | 87 -20.2 |
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