Viewing archive of Tuesday, 21 April 2020
Solar activity report
Report of Solar-Geophysical Activity 2020 Apr 21 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 112 Issued at 2200Z on 21 Apr 2020IA. Analysis of Solar Active Regions and Activity from 20-2100Z to 21-2100Z Solar activity has been at very low levels for the past 24
hours. There are currently 0 numbered sunspot regions on the disk.
IB. Solar Activity Forecast
Solar activity is expected to be very low
on days one, two, and three (22 Apr, 23 Apr, 24 Apr).
IIA. Geophysical Activity Summary 20-2100Z to 21-2100Z
The geomagnetic
field has been at quiet to active levels for the past 24 hours. Solar
wind speed reached a peak of 458 km/s at 21/2053Z. Total IMF reached 15
nT at 21/0240Z. The maximum southward component of Bz reached -9 nT at
21/1542Z. Electrons greater than 2 MeV at geosynchronous orbit reached
a peak level of 190 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to unsettled levels on days one and two (22 Apr, 23 Apr)
and quiet levels on day three (24 Apr).
III. Event Probabilities 22 Apr to 24 Apr
| Class M | 01% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 21 Apr 069 Predicted 22 Apr-24 Apr 069/069/069 90 Day Mean 21 Apr 071
V. Geomagnetic A Indices
Observed Afr/Ap 20 Apr 016/023 Estimated Afr/Ap 21 Apr 009/010 Predicted Afr/Ap 22 Apr-24 Apr 007/008-007/010-006/005
VI. Geomagnetic Activity Probabilities 22 Apr to 24 Apr
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 15% | 20% | 10% |
| Minor storm | 05% | 05% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 25% | 25% | 20% |
| Major-severe storm | 25% | 30% | 10% |
All times in UTC
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