Viewing archive of Tuesday, 13 April 2021
Solar activity report
Report of Solar-Geophysical Activity 2021 Apr 13 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 103 Issued at 2200Z on 13 Apr 2021IA. Analysis of Solar Active Regions and Activity from 12-2100Z to 13-2100Z 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
with a slight chance for a C-class flare on days one, two, and three (14
Apr, 15 Apr, 16 Apr).
IIA. Geophysical Activity Summary 12-2100Z to 13-2100Z
The geomagnetic
field has been at quiet levels for the past 24 hours. Solar wind speed
reached a peak of 383 km/s at 12/2137Z. Total IMF reached 7 nT at
13/1932Z. The maximum southward component of Bz reached -3 nT at
13/0854Z. Electrons greater than 2 MeV at geosynchronous orbit reached
a peak level of 126 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet levels on day one (14 Apr), quiet to unsettled levels on
day two (15 Apr) and quiet to active levels on day three (16 Apr).
III. Event Probabilities 14 Apr to 16 Apr
| Class M | 01% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 13 Apr 073 Predicted 14 Apr-16 Apr 074/074/072 90 Day Mean 13 Apr 076
V. Geomagnetic A Indices
Observed Afr/Ap 12 Apr 004/004 Estimated Afr/Ap 13 Apr 005/005 Predicted Afr/Ap 14 Apr-16 Apr 006/005-007/008-014/018
VI. Geomagnetic Activity Probabilities 14 Apr to 16 Apr
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 10% | 20% | 40% |
| Minor storm | 01% | 05% | 15% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 10% |
| Minor storm | 20% | 25% | 25% |
| Major-severe storm | 15% | 25% | 50% |
All times in UTC
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Space weather facts
| Last X-flare | 2026/03/30 | X1.5 |
| Last M-flare | 2026/04/09 | 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 | 101.7 +15.8 |
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