Viewing archive of Sunday, 28 June 2026
Solar activity report
Report of Solar-Geophysical Activity 2026 Jun 28 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 179 Issued at 2200Z on 28 Jun 2026IA. Analysis of Solar Active Regions and Activity from 27-2100Z to 28-2100Z 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 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 Jun, 30 Jun, 01 Jul).
IIA. Geophysical Activity Summary 27-2100Z to 28-2100Z
The geomagnetic
field has been at quiet levels for the past 24 hours. Solar wind speed
reached a peak of 544 km/s at 28/0138Z. Electrons greater than 2 MeV at
geosynchronous orbit reached a peak level of 2637 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to minor storm levels on days one and two (29 Jun, 30
Jun) and quiet to active levels on day three (01 Jul).
III. Event Probabilities 29 Jun to 01 Jul
| Class M | 50% | 50% | 50% |
| Class X | 10% | 10% | 10% |
| Proton | 05% | 05% | 05% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 28 Jun 186 Predicted 29 Jun-01 Jul 175/180/175 90 Day Mean 28 Jun 127
V. Geomagnetic A Indices
Observed Afr/Ap 27 Jun 008/007 Estimated Afr/Ap 28 Jun 009/010 Predicted Afr/Ap 29 Jun-01 Jul 008/010-018/025-011/012
VI. Geomagnetic Activity Probabilities 29 Jun to 01 Jul
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 30% | 45% | 35% |
| Minor storm | 25% | 30% | 20% |
| Major-severe storm | 05% | 05% | 05% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 10% | 05% | 10% |
| Minor storm | 20% | 30% | 25% |
| Major-severe storm | 55% | 65% | 55% |
All times in UTC
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Space weather facts
| Last X-flare | 2026/06/03 | X1.0 |
| Last M-flare | 2026/06/21 | M6.9 |
| Last geomagnetic storm | 2026/06/25 | Kp5 (G1) |
| Spotless days | |
|---|---|
| Last 365 days | 3 days |
| 2026 | 3 days (2%) |
| Last spotless day | 2026/02/24 |
| Monthly mean Sunspot Number | |
|---|---|
| May 2026 | 101.4 +22.1 |
| June 2026 | 101.2 -0.2 |
| Last 30 days | 102.6 +3.6 |
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