Viewing archive of Thursday, 4 February 2021
Solar activity report
Report of Solar-Geophysical Activity 2021 Feb 04 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 35 Issued at 2200Z on 04 Feb 2021IA. Analysis of Solar Active Regions and Activity from 03-2100Z to 04-2100Z 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 (05 Feb, 06 Feb, 07 Feb).
IIA. Geophysical Activity Summary 03-2100Z to 04-2100Z
The geomagnetic
field has been at quiet to unsettled levels for the past 24 hours. Solar
wind speed reached a peak of 551 km/s at 04/0505Z. Total IMF reached 7
nT at 03/2355Z. The maximum southward component of Bz reached -6 nT at
04/0039Z. Electrons greater than 2 MeV at geosynchronous orbit reached
a peak level of 342 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet levels on day one (05 Feb), quiet to unsettled levels on
day two (06 Feb) and quiet to active levels on day three (07 Feb).
III. Event Probabilities 05 Feb to 07 Feb
| Class M | 01% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 04 Feb 074 Predicted 05 Feb-07 Feb 074/074/074 90 Day Mean 04 Feb 084
V. Geomagnetic A Indices
Observed Afr/Ap 03 Feb 010/011 Estimated Afr/Ap 04 Feb 008/007 Predicted Afr/Ap 05 Feb-07 Feb 005/005-007/008-014/016
VI. Geomagnetic Activity Probabilities 05 Feb to 07 Feb
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 10% | 20% | 30% |
| Minor storm | 01% | 05% | 10% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 20% | 15% | 15% |
| Minor storm | 20% | 25% | 30% |
| Major-severe storm | 10% | 25% | 40% |
All times in UTC
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Space weather facts
| Last X-flare | 2026/03/30 | X1.5 |
| Last M-flare | 2026/04/04 | M1.0 |
| Last geomagnetic storm | 2026/04/03 | Kp7- (G3) |
| Spotless days | |
|---|---|
| Last 365 days | 3 days |
| 2026 | 3 days (3%) |
| Last spotless day | 2026/02/24 |
| Monthly mean Sunspot Number | |
|---|---|
| March 2026 | 85.9 +7.7 |
| April 2026 | 128.3 +42.3 |
| Last 30 days | 97.5 +35.7 |
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