Viewing archive of Monday, 28 June 2021
Solar activity report
Report of Solar-Geophysical Activity 2021 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 2021IA. 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.
The largest solar event of the period was a C2 event observed at
28/0935Z from Region 2836 (S28E21). There are currently 3 numbered
sunspot regions on the disk.
IB. Solar Activity Forecast
Solar activity is expected to be very low
with a chance for a C-class flares 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 384 km/s at 27/2340Z. Total IMF reached 5 nT at
28/0105Z. The maximum southward component of Bz reached -3 nT at
27/2231Z. Electrons greater than 2 MeV at geosynchronous orbit reached
a peak level of 343 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet levels on day one (29 Jun) and quiet to unsettled levels
on days two and three (30 Jun, 01 Jul).
III. Event Probabilities 29 Jun to 01 Jul
| Class M | 05% | 05% | 05% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 28 Jun 089 Predicted 29 Jun-01 Jul 090/090/090 90 Day Mean 28 Jun 077
V. Geomagnetic A Indices
Observed Afr/Ap 27 Jun 004/005 Estimated Afr/Ap 28 Jun 003/004 Predicted Afr/Ap 29 Jun-01 Jul 005/005-008/010-008/010
VI. Geomagnetic Activity Probabilities 29 Jun to 01 Jul
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 10% | 15% | 20% |
| Minor storm | 01% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 20% | 15% | 15% |
| Minor storm | 20% | 25% | 25% |
| Major-severe storm | 10% | 25% | 30% |
All times in UTC
Latest news
Monday, 19 January 2026
CME impact! S4 solar radiation storm
Sunday, 18 January 2026
X1.9 solar flare with earth-directed CME
Wednesday, 31 December 2025
Happy New Year! Celebrate with an M7.1 solar flare!
Latest forum messages
X1.9 CME 1227Space Weather Memes 775AR 4345 19AR 14342/14344 8sunspot capture samsung smartphone possible? 6
More topicsSupport SpaceWeatherLive.com!
A lot of people come to SpaceWeatherLive to follow the Solar activity or if there is a chance to see the aurora, but with more traffic comes higher costs to keep the servers online. If you like SpaceWeatherLive and want to support the project you can choose a subscription for an ad-free site or consider a donation. With your help we can keep SpaceWeatherLive online!
Space weather facts
| Last X-flare | 2026/01/18 | X1.9 |
| Last M-flare | 2026/01/21 | M1.1 |
| Last geomagnetic storm | 2026/01/20 | Kp8 (G4) |
| Spotless days | |
|---|---|
| Last spotless day | 2022/06/08 |
| Monthly mean Sunspot Number | |
|---|---|
| December 2025 | 124 +32.2 |
| January 2026 | 107.3 -16.8 |
| Last 30 days | 111.9 +4 |