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Solar activity report
Report of Solar-Geophysical Activity 2026 Mar 28 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 87 Issued at 2200Z on 28 Mar 2026IA. Analysis of Solar Active Regions and Activity from 27-2100Z to 28-2100Z Solar activity has been at moderate levels for the past 24
hours. There are currently 8 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 (29 Mar, 30 Mar, 31 Mar).
IIA. Geophysical Activity Summary 27-2100Z to 28-2100Z
The geomagnetic
field has been at quiet to unsettled levels for the past 24 hours. Solar
wind speed reached a peak of 434 km/s at 27/2114Z. Total IMF reached 7
nT at 28/2057Z. The maximum southward component of Bz reached -7 nT at
28/2057Z. Electrons greater than 2 MeV at geosynchronous orbit reached
a peak level of 1596 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to unsettled levels on day one (29 Mar), quiet to minor
storm levels on day two (30 Mar) and quiet to active levels on day three
(31 Mar).
III. Event Probabilities 29 Mar to 31 Mar
| Class M | 50% | 50% | 50% |
| Class X | 10% | 10% | 10% |
| Proton | 05% | 05% | 05% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 28 Mar 162 Predicted 29 Mar-31 Mar 160/158/155 90 Day Mean 28 Mar 140
V. Geomagnetic A Indices
Observed Afr/Ap 27 Mar 006/007 Estimated Afr/Ap 28 Mar 009/009 Predicted Afr/Ap 29 Mar-31 Mar 007/008-013/018-010/012
VI. Geomagnetic Activity Probabilities 29 Mar to 31 Mar
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 20% | 40% | 30% |
| Minor storm | 05% | 25% | 10% |
| Major-severe storm | 01% | 05% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 10% | 15% |
| Minor storm | 25% | 25% | 25% |
| Major-severe storm | 25% | 60% | 40% |
All times in UTC
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Space weather facts
| Last X-flare | 2026/04/24 | X2.5 |
| Last M-flare | 2026/05/22 | M2.3 |
| Last geomagnetic storm | 2026/05/16 | Kp6- (G2) |
| Spotless days | |
|---|---|
| Last 365 days | 3 days |
| 2026 | 3 days (2%) |
| Last spotless day | 2026/02/24 |
| Monthly mean Sunspot Number | |
|---|---|
| April 2026 | 79.3 -6.6 |
| May 2026 | 94.2 +14.9 |
| Last 30 days | 97.1 +4.3 |
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