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Solar activity report
Report of Solar-Geophysical Activity 2025 Mar 18 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 77 Issued at 2200Z on 18 Mar 2025IA. Analysis of Solar Active Regions and Activity from 17-2100Z to 18-2100Z Solar activity has been at low levels for the past 24 hours.
There are currently 13 numbered sunspot regions on the disk.
IB. Solar Activity Forecast
Solar activity is expected to be low with
a chance for M-class flares and a slight chance for an X-class flare on
days one, two, and three (19 Mar, 20 Mar, 21 Mar).
IIA. Geophysical Activity Summary 17-2100Z to 18-2100Z
The geomagnetic
field has been at quiet to unsettled levels for the past 24 hours. Solar
wind speed reached a peak of 480 km/s at 18/1810Z. Total IMF reached 10
nT at 18/2057Z. The maximum southward component of Bz reached -7 nT at
18/1223Z. Electrons greater than 2 MeV at geosynchronous orbit reached
a peak level of 3091 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to active levels on days one and two (19 Mar, 20 Mar) and
quiet to unsettled levels on day three (21 Mar).
III. Event Probabilities 19 Mar to 21 Mar
| Class M | 50% | 50% | 50% |
| Class X | 10% | 10% | 10% |
| Proton | 05% | 05% | 05% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 18 Mar 184 Predicted 19 Mar-21 Mar 185/185/190 90 Day Mean 18 Mar 189
V. Geomagnetic A Indices
Observed Afr/Ap 17 Mar 014/014 Estimated Afr/Ap 18 Mar 012/015 Predicted Afr/Ap 19 Mar-21 Mar 010/012-011/012-007/008
VI. Geomagnetic Activity Probabilities 19 Mar to 21 Mar
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 30% | 30% | 20% |
| Minor storm | 10% | 10% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 30% | 30% | 30% |
| Major-severe storm | 40% | 40% | 30% |
All times in UTC
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Space weather facts
| Last X-flare | 2025/03/28 | X1.1 |
| Last M-flare | 2025/03/28 | M1.0 |
| Last geomagnetic storm | 2025/03/27 | Kp5 (G1) |
| Spotless days | |
|---|---|
| Last spotless day | 2022/06/08 |
| Monthly mean Sunspot Number | |
|---|---|
| February 2025 | 154.6 +17.6 |
| March 2025 | 130 -24.6 |
| Last 30 days | 130 -22.2 |