Viewing archive of Friday, 30 July 2021
Solar activity report
Report of Solar-Geophysical Activity 2021 Jul 30 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 211 Issued at 2200Z on 30 Jul 2021IA. Analysis of Solar Active Regions and Activity from 29-2100Z to 30-2100Z Solar activity has been at very low levels for the past 24
hours. There are currently 0 numbered sunspot regions on the disk.
IB. Solar Activity Forecast
Solar activity is expected to be very low
on days one, two, and three (31 Jul, 01 Aug, 02 Aug).
IIA. Geophysical Activity Summary 29-2100Z to 30-2100Z
The geomagnetic
field has been at quiet levels for the past 24 hours. Solar wind speed
reached a peak of 522 km/s at 30/1220Z. Total IMF reached 5 nT at
30/0355Z. The maximum southward component of Bz reached -3 nT at
30/0629Z. Electrons greater than 2 MeV at geosynchronous orbit reached
a peak level of 779 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to unsettled levels on days one and three (31 Jul, 02
Aug) and quiet to active levels on day two (01 Aug).
III. Event Probabilities 31 Jul to 02 Aug
| Class M | 01% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 30 Jul 076 Predicted 31 Jul-02 Aug 076/074/072 90 Day Mean 30 Jul 079
V. Geomagnetic A Indices
Observed Afr/Ap 29 Jul 012/009 Estimated Afr/Ap 30 Jul 007/008 Predicted Afr/Ap 31 Jul-02 Aug 008/010-010/012-007/008
VI. Geomagnetic Activity Probabilities 31 Jul to 02 Aug
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 25% | 30% | 20% |
| Minor storm | 10% | 10% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 30% | 30% | 25% |
| Major-severe storm | 40% | 40% | 25% |
All times in UTC
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