Viewing archive of Friday, 28 May 2021
Solar activity report
Report of Solar-Geophysical Activity 2021 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 2021IA. 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.
The largest solar event of the period was a C7 event observed at
27/2315Z from Region 2824 (N20W55). There are currently 2 numbered
sunspot regions on the disk.
IB. Solar Activity Forecast
Solar activity is likely to be low with a
slight chance for an M-class flare on day one (29 May) and expected to
be very low with a chance for a C-class flares on day two (30 May) and
expected to be very low with a slight chance for a C-class flare on day
three (31 May).
IIA. Geophysical Activity Summary 27-2100Z to 28-2100Z
The geomagnetic
field has been at quiet levels for the past 24 hours. Solar wind speed
reached a peak of 455 km/s at 28/0257Z. Total IMF reached 8 nT at
28/0255Z. The maximum southward component of Bz reached -2 nT at
28/1611Z. Electrons greater than 2 MeV at geosynchronous orbit reached
a peak level of 178 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet levels on days one and three (29 May, 31 May) and quiet
to unsettled levels on day two (30 May).
III. Event Probabilities 29 May to 31 May
| Class M | 10% | 05% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 28 May 077 Predicted 29 May-31 May 075/074/072 90 Day Mean 28 May 076
V. Geomagnetic A Indices
Observed Afr/Ap 27 May 015/014 Estimated Afr/Ap 28 May 004/005 Predicted Afr/Ap 29 May-31 May 005/005-008/008-006/005
VI. Geomagnetic Activity Probabilities 29 May to 31 May
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 10% | 15% | 10% |
| Minor storm | 01% | 05% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 20% | 25% | 20% |
| Major-severe storm | 10% | 25% | 10% |
All times in UTC
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