Viewing archive of Monday, 31 May 2021
Solar activity report
Report of Solar-Geophysical Activity 2021 May 31 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 151 Issued at 2200Z on 31 May 2021IA. Analysis of Solar Active Regions and Activity from 30-2100Z to 31-2100Z Solar activity has been at very low levels for the past 24
hours. There are currently 2 numbered sunspot regions on the disk.
IB. Solar Activity Forecast
Solar activity is expected to be very low
with a chance for a C-class flares on days one, two, and three (01 Jun,
02 Jun, 03 Jun).
IIA. Geophysical Activity Summary 30-2100Z to 31-2100Z
The geomagnetic
field has been at quiet to unsettled levels for the past 24 hours. Solar
wind speed reached a peak of 423 km/s at 30/2250Z. Electrons greater
than 2 MeV at geosynchronous orbit reached a peak level of 176 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to active levels on days one and two (01 Jun, 02 Jun) and
quiet to unsettled levels on day three (03 Jun).
III. Event Probabilities 01 Jun to 03 Jun
| Class M | 01% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 31 May 082 Predicted 01 Jun-03 Jun 082/082/082 90 Day Mean 31 May 077
V. Geomagnetic A Indices
Observed Afr/Ap 30 May 007/007 Estimated Afr/Ap 31 May 005/005 Predicted Afr/Ap 01 Jun-03 Jun 015/018-014/015-007/008
VI. Geomagnetic Activity Probabilities 01 Jun to 03 Jun
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 35% | 35% | 15% |
| Minor storm | 10% | 10% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 30% | 30% | 25% |
| Major-severe storm | 45% | 45% | 25% |
All times in UTC
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