Viewing archive of Thursday, 21 January 2021
Solar activity report
Report of Solar-Geophysical Activity 2021 Jan 21 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 21 Issued at 2200Z on 21 Jan 2021IA. 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 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 (22 Jan,
23 Jan, 24 Jan).
IIA. Geophysical Activity Summary 20-2100Z to 21-2100Z
The geomagnetic
field has been at quiet levels for the past 24 hours. Solar wind speed
reached a peak of 345 km/s at 20/2258Z. Total IMF reached 5 nT at
20/2101Z. The maximum southward component of Bz reached -2 nT at
21/0948Z. Electrons greater than 2 MeV at geosynchronous orbit reached
a peak level of 207 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet levels on days one, two, and three (22 Jan, 23 Jan, 24
Jan).
III. Event Probabilities 22 Jan to 24 Jan
| Class M | 05% | 05% | 05% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 21 Jan 078 Predicted 22 Jan-24 Jan 078/078/078 90 Day Mean 21 Jan 085
V. Geomagnetic A Indices
Observed Afr/Ap 20 Jan 005/005 Estimated Afr/Ap 21 Jan 003/003 Predicted Afr/Ap 22 Jan-24 Jan 005/005-006/005-005/005
VI. Geomagnetic Activity Probabilities 22 Jan to 24 Jan
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 10% | 10% | 10% |
| Minor storm | 01% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 20% | 20% | 20% |
| Minor storm | 20% | 20% | 20% |
| Major-severe storm | 10% | 10% | 10% |
All times in UTC
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Space weather facts
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| Last geomagnetic storm | 2024/11/09 | Kp5 (G1) |
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| Monthly mean Sunspot Number | |
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