Viewing archive of Sunday, 25 July 2021
Solar activity report
Report of Solar-Geophysical Activity 2021 Jul 25 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 206 Issued at 2200Z on 25 Jul 2021IA. Analysis of Solar Active Regions and Activity from 24-2100Z to 25-2100Z 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 (26
Jul, 27 Jul, 28 Jul).
IIA. Geophysical Activity Summary 24-2100Z to 25-2100Z
The geomagnetic
field has been at quiet levels for the past 24 hours. Solar wind speed
reached a peak of 471 km/s at 25/0559Z. Total IMF reached 5 nT at
24/2146Z. The maximum southward component of Bz reached -2 nT at
25/0250Z. Electrons greater than 2 MeV at geosynchronous orbit reached
a peak level of 310 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet levels on days one and two (26 Jul, 27 Jul) and quiet to
active levels on day three (28 Jul).
III. Event Probabilities 26 Jul to 28 Jul
| Class M | 01% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 25 Jul 082 Predicted 26 Jul-28 Jul 082/082/082 90 Day Mean 25 Jul 079
V. Geomagnetic A Indices
Observed Afr/Ap 24 Jul 005/004 Estimated Afr/Ap 25 Jul 004/005 Predicted Afr/Ap 26 Jul-28 Jul 005/005-005/005-009/012
VI. Geomagnetic Activity Probabilities 26 Jul to 28 Jul
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 10% | 10% | 30% |
| Minor storm | 01% | 01% | 10% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 20% | 20% | 30% |
| Major-severe storm | 15% | 15% | 40% |
All times in UTC
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