Viewing archive of Thursday, 26 June 2025
Solar activity report
Report of Solar-Geophysical Activity 2025 Jun 26 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 177 Issued at 2200Z on 26 Jun 2025IA. Analysis of Solar Active Regions and Activity from 25-2100Z to 26-2100Z Solar activity has been at low levels for the past 24 hours.
There are currently 5 numbered sunspot regions on the disk.
IB. Solar Activity Forecast
Solar activity is likely to be low with a
chance for M-class flares on day one (27 Jun) and expected to be low
with a chance for M-class flares on days two and three (28 Jun, 29 Jun).
IIA. Geophysical Activity Summary 25-2100Z to 26-2100Z
The geomagnetic
field has been at unsettled to active levels for the past 24 hours.
Solar wind speed reached a peak of 849 km/s at 26/0957Z. Total IMF
reached 16 nT at 25/2114Z. The maximum southward component of Bz reached
-11 nT at 25/2223Z. Electrons greater than 2 MeV at geosynchronous
orbit reached a peak level of 279 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to minor storm levels on day one (27 Jun), quiet to
active levels on day two (28 Jun) and quiet to unsettled levels on day
three (29 Jun).
III. Event Probabilities 27 Jun to 29 Jun
| Class M | 25% | 30% | 30% |
| Class X | 05% | 05% | 05% |
| Proton | 05% | 05% | 05% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 26 Jun 117 Predicted 27 Jun-29 Jun 125/130/135 90 Day Mean 26 Jun 145
V. Geomagnetic A Indices
Observed Afr/Ap 25 Jun 016/ NA Estimated Afr/Ap 26 Jun 017/024 Predicted Afr/Ap 27 Jun-29 Jun 017/020-011/014-007/008
VI. Geomagnetic Activity Probabilities 27 Jun to 29 Jun
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 35% | 30% | 20% |
| Minor storm | 20% | 10% | 05% |
| Major-severe storm | 05% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 10% | 15% | 15% |
| Minor storm | 25% | 25% | 25% |
| Major-severe storm | 55% | 40% | 25% |
All times in UTC
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Space weather facts
| Last X-flare | 2026/01/18 | X1.9 |
| Last M-flare | 2026/01/21 | M3.4 |
| Last geomagnetic storm | 2026/01/22 | Kp5+ (G1) |
| Spotless days | |
|---|---|
| Last spotless day | 2022/06/08 |
| Monthly mean Sunspot Number | |
|---|---|
| December 2025 | 124 +32.2 |
| January 2026 | 117.9 -6.1 |
| Last 30 days | 121.2 +12.1 |