Viewing archive of Monday, 26 July 2021
Solar activity report
Report of Solar-Geophysical Activity 2021 Jul 26 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 207 Issued at 2200Z on 26 Jul 2021IA. Analysis of Solar Active Regions and Activity from 25-2100Z to 26-2100Z Solar activity has been at very low levels for the past 24
hours. There are currently 2 numbered sunspot regions on the disk.
IB. Solar Activity Forecast
Solar activity is expected to be very low
with a slight chance for a C-class flare on days one, two, and three (27
Jul, 28 Jul, 29 Jul).
IIA. Geophysical Activity Summary 25-2100Z to 26-2100Z
The geomagnetic
field has been at quiet levels for the past 24 hours. Solar wind speed
reached a peak of 396 km/s at 26/0710Z. Electrons greater than 2 MeV at
geosynchronous orbit reached a peak level of 484 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to unsettled levels on days one and three (27 Jul, 29
Jul) and quiet to active levels on day two (28 Jul).
III. Event Probabilities 27 Jul to 29 Jul
| Class M | 01% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 26 Jul 081 Predicted 27 Jul-29 Jul 082/082/080 90 Day Mean 26 Jul 079
V. Geomagnetic A Indices
Observed Afr/Ap 25 Jul 005/003 Estimated Afr/Ap 26 Jul 004/004 Predicted Afr/Ap 27 Jul-29 Jul 007/008-009/012-008/010
VI. Geomagnetic Activity Probabilities 27 Jul to 29 Jul
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 10% | 30% | 25% |
| Minor storm | 01% | 10% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 25% | 30% | 30% |
| Major-severe storm | 20% | 40% | 30% |
All times in UTC
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