Viewing archive of Friday, 20 October 2023
Solar activity report
Report of Solar-Geophysical Activity 2023 Oct 20 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 293 Issued at 2200Z on 20 Oct 2023IA. Analysis of Solar Active Regions and Activity from 19-2100Z to 20-2100Z 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
20/0500Z. There are currently 4 numbered sunspot regions on the disk.
IB. Solar Activity Forecast
Solar activity is likely to be low on days
one, two, and three (21 Oct, 22 Oct, 23 Oct).
IIA. Geophysical Activity Summary 19-2100Z to 20-2100Z
The geomagnetic
field has been at quiet levels for the past 24 hours. Solar wind speed
reached a peak of 378 km/s at 20/1208Z. Total IMF reached 10 nT at
20/1743Z. The maximum southward component of Bz reached -8 nT at
20/1847Z. Electrons greater than 2 MeV at geosynchronous orbit reached
a peak level of 183 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to active levels on day one (21 Oct) and quiet to
unsettled levels on days two and three (22 Oct, 23 Oct).
III. Event Probabilities 21 Oct to 23 Oct
| Class M | 05% | 05% | 05% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 20 Oct 126 Predicted 21 Oct-23 Oct 124/124/122 90 Day Mean 20 Oct 155
V. Geomagnetic A Indices
Observed Afr/Ap 19 Oct 008/010 Estimated Afr/Ap 20 Oct 009/014 Predicted Afr/Ap 21 Oct-23 Oct 010/012-010/012-008/010
VI. Geomagnetic Activity Probabilities 21 Oct to 23 Oct
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 30% | 25% | 20% |
| Minor storm | 10% | 10% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 25% | 25% | 25% |
| Major-severe storm | 40% | 35% | 25% |
All times in UTC
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