Viewing archive of Saturday, 20 March 2021
Solar activity report
Report of Solar-Geophysical Activity 2021 Mar 20 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 79 Issued at 2200Z on 20 Mar 2021IA. Analysis of Solar Active Regions and Activity from 19-2100Z to 20-2100Z Solar activity has been at very low levels for the past 24
hours. There are currently 1 numbered sunspot regions on the disk.
IB. Solar Activity Forecast
Solar activity is expected to be very low
on days one, two, and three (21 Mar, 22 Mar, 23 Mar).
IIA. Geophysical Activity Summary 19-2100Z to 20-2100Z
The geomagnetic
field has been at quiet to major storm levels for the past 24 hours.
Solar wind speed reached a peak of 676 km/s at 20/1617Z. Total IMF
reached 23 nT at 20/0412Z. The maximum southward component of Bz reached
-19 nT at 20/0510Z. Electrons greater than 2 MeV at geosynchronous
orbit reached a peak level of 500 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at unsettled to minor storm levels on day one (21 Mar), quiet to
minor storm levels on day two (22 Mar) and unsettled to active levels on
day three (23 Mar).
III. Event Probabilities 21 Mar to 23 Mar
| Class M | 01% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 20 Mar 080 Predicted 21 Mar-23 Mar 078/078/078 90 Day Mean 20 Mar 077
V. Geomagnetic A Indices
Observed Afr/Ap 19 Mar 006/006 Estimated Afr/Ap 20 Mar 021/031 Predicted Afr/Ap 21 Mar-23 Mar 016/022-015/020-014/018
VI. Geomagnetic Activity Probabilities 21 Mar to 23 Mar
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 40% | 40% | 35% |
| Minor storm | 25% | 25% | 10% |
| Major-severe storm | 05% | 05% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 20% |
| Minor storm | 25% | 20% | 25% |
| Major-severe storm | 35% | 30% | 25% |
All times in UTC
Latest news
Monday, 11 November 2024
Coronal hole faces Earth
Friday, 1 November 2024
X2.0 solar flare
Wednesday, 9 October 2024
X1.8 solar flare, severe geomagnetic storm watch
Latest forum messages
Unspecified geomagnetic activity 1645Incoming & Unnumbered Active Regions 1210sun goes blank 76Space Weather Memes 571AR13883 2024/11/04 CME 45
More topicsSupport SpaceWeatherLive.com!
A lot of people come to SpaceWeatherLive to follow the Sun's activity or if there is aurora to be seen, but with more traffic comes higher server costs. Consider a donation if you enjoy SpaceWeatherLive so we can keep the website online!
Space weather facts
| Last X-flare | 2024/11/06 | X2.39 |
| Last M-flare | 2024/11/13 | M1.7 |
| Last geomagnetic storm | 2024/11/10 | Kp5+ (G1) |
| Spotless days | |
|---|---|
| Last spotless day | 2022/06/08 |
| Monthly mean Sunspot Number | |
|---|---|
| October 2024 | 166.4 +25 |
| November 2024 | 166 -0.4 |
| Last 30 days | 163.2 +18.4 |