Viewing archive of Thursday, 29 July 2021
Solar activity report
Report of Solar-Geophysical Activity 2021 Jul 29 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 210 Issued at 2200Z on 29 Jul 2021IA. Analysis of Solar Active Regions and Activity from 28-2100Z to 29-2100Z 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 (30 Jul, 31 Jul, 01 Aug).
IIA. Geophysical Activity Summary 28-2100Z to 29-2100Z
The geomagnetic
field has been at quiet to unsettled levels for the past 24 hours. Solar
wind speed reached a peak of 574 km/s at 29/0345Z. Total IMF reached 6
nT at 29/1901Z. The maximum southward component of Bz reached -4 nT at
29/0753Z. Electrons greater than 2 MeV at geosynchronous orbit reached
a peak level of 383 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to unsettled levels on days one and two (30 Jul, 31 Jul)
and quiet to active levels on day three (01 Aug).
III. Event Probabilities 30 Jul to 01 Aug
| Class M | 01% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 29 Jul 076 Predicted 30 Jul-01 Aug 076/076/074 90 Day Mean 29 Jul 079
V. Geomagnetic A Indices
Observed Afr/Ap 28 Jul 013/013 Estimated Afr/Ap 29 Jul 008/008 Predicted Afr/Ap 30 Jul-01 Aug 008/008-008/010-010/012
VI. Geomagnetic Activity Probabilities 30 Jul to 01 Aug
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 25% | 25% | 30% |
| Minor storm | 05% | 10% | 10% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 30% | 30% | 30% |
| Major-severe storm | 30% | 40% | 40% |
All times in UTC
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