Viewing archive of Saturday, 21 June 2025
Solar activity report
Report of Solar-Geophysical Activity 2025 Jun 21 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 172 Issued at 2200Z on 21 Jun 2025IA. Analysis of Solar Active Regions and Activity from 20-2100Z to 21-2100Z Solar activity has been at low levels for the past 24 hours.
There are currently 6 numbered sunspot regions on the disk.
IB. Solar Activity Forecast
Solar activity is likely to be moderate
with a slight chance for an X-class flare on days one, two, and three
(22 Jun, 23 Jun, 24 Jun).
IIA. Geophysical Activity Summary 20-2100Z to 21-2100Z
The geomagnetic
field has been at quiet to active levels for the past 24 hours. Solar
wind speed reached a peak of 600 km/s at 21/0732Z. Total IMF reached 9
nT at 21/1657Z. The maximum southward component of Bz reached -7 nT at
21/1525Z. Electrons greater than 2 MeV at geosynchronous orbit reached
a peak level of 1150 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to unsettled levels on day one (22 Jun) and quiet to
active levels on days two and three (23 Jun, 24 Jun). Protons have a
slight chance of crossing threshold on days one, two, and three (22 Jun,
23 Jun, 24 Jun).
III. Event Probabilities 22 Jun to 24 Jun
| Class M | 55% | 55% | 55% |
| Class X | 10% | 10% | 10% |
| Proton | 10% | 10% | 10% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 21 Jun 120 Predicted 22 Jun-24 Jun 120/115/115 90 Day Mean 21 Jun 147
V. Geomagnetic A Indices
Observed Afr/Ap 20 Jun 008/011 Estimated Afr/Ap 21 Jun 010/011 Predicted Afr/Ap 22 Jun-24 Jun 007/010-010/012-010/012
VI. Geomagnetic Activity Probabilities 22 Jun to 24 Jun
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 20% | 30% | 30% |
| Minor storm | 05% | 10% | 10% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 30% | 25% | 25% |
| Major-severe storm | 25% | 40% | 40% |
All times in UTC
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Space weather facts
| Last X-flare | 2026/03/30 | X1.5 |
| Last M-flare | 2026/04/04 | 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 | 125 +39.1 |
| Last 30 days | 98.7 +39 |
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