Viewing archive of Thursday, 12 March 2026
Solar activity report
Report of Solar-Geophysical Activity 2026 Mar 12 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 71 Issued at 2200Z on 12 Mar 2026IA. Analysis of Solar Active Regions and Activity from 11-2100Z to 12-2100Z Solar activity has been at low levels for the past 24 hours.
There are currently 9 numbered sunspot regions on the disk.
IB. Solar Activity Forecast
Solar activity is expected to be low with
a slight chance for an M-class flare on days one, two, and three (13
Mar, 14 Mar, 15 Mar).
IIA. Geophysical Activity Summary 11-2100Z to 12-2100Z
The geomagnetic
field has been at quiet to unsettled levels for the past 24 hours. Solar
wind speed reached a peak of 486 km/s at 11/2245Z. Total IMF reached 6
nT at 12/0124Z. The maximum southward component of Bz reached -5 nT at
12/1258Z. Electrons greater than 2 MeV at geosynchronous orbit reached
a peak level of 2940 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to minor storm levels on days one and two (13 Mar, 14
Mar) and quiet to active levels on day three (15 Mar).
III. Event Probabilities 13 Mar to 15 Mar
| Class M | 20% | 20% | 20% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 12 Mar 121 Predicted 13 Mar-15 Mar 120/115/110 90 Day Mean 12 Mar 142
V. Geomagnetic A Indices
Observed Afr/Ap 11 Mar 007/009 Estimated Afr/Ap 12 Mar 007/008 Predicted Afr/Ap 13 Mar-15 Mar 015/020-017/020-012/012
VI. Geomagnetic Activity Probabilities 13 Mar to 15 Mar
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 45% | 45% | 35% |
| Minor storm | 25% | 25% | 15% |
| Major-severe storm | 05% | 05% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 05% | 05% | 10% |
| Minor storm | 20% | 20% | 25% |
| Major-severe storm | 65% | 65% | 45% |
All times in UTC
Latest news
Tuesday, 17 March 2026
M2.7 solar flare, CME arrival possible
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Complex sunspot region 4366
Monday, 19 January 2026
CME impact! S4 solar radiation storm
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Space weather facts
| Last X-flare | 2026/02/04 | X4.21 |
| Last M-flare | 2026/03/28 | M1.3 |
| Last geomagnetic storm | 2026/03/25 | Kp5+ (G1) |
| Spotless days | |
|---|---|
| Last 365 days | 3 days |
| 2026 | 3 days (3%) |
| Last spotless day | 2026/02/24 |
| Monthly mean Sunspot Number | |
|---|---|
| February 2026 | 78.2 -34.3 |
| March 2026 | 85.2 +7 |
| Last 30 days | 85.2 +8.6 |
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