Viewing archive of Thursday, 17 August 2023
Solar activity report
Report of Solar-Geophysical Activity 2023 Aug 17 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 229 Issued at 2200Z on 17 Aug 2023IA. Analysis of Solar Active Regions and Activity from 16-2100Z to 17-2100Z Solar activity has been at low levels for the past 24 hours.
The largest solar event of the period was a C5 event observed at
17/1240Z from Region 3397 (N17W83). There are currently 9 numbered
sunspot regions on the disk.
IB. Solar Activity Forecast
Solar activity is expected to be low with
a slight chance for an M-class flare on days one, two, and three (18
Aug, 19 Aug, 20 Aug).
IIA. Geophysical Activity Summary 16-2100Z to 17-2100Z
The geomagnetic
field has been at quiet to unsettled levels for the past 24 hours. Solar
wind speed reached a peak of 348 km/s at 17/1627Z. Total IMF reached 11
nT at 17/2030Z. The maximum southward component of Bz reached -6 nT at
17/1533Z.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to active levels on day one (18 Aug), quiet to unsettled
levels on day two (19 Aug) and quiet levels on day three (20 Aug).
III. Event Probabilities 18 Aug to 20 Aug
| Class M | 15% | 15% | 15% |
| Class X | 05% | 05% | 05% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 17 Aug 152 Predicted 18 Aug-20 Aug 150/155/157 90 Day Mean 17 Aug 167
V. Geomagnetic A Indices
Observed Afr/Ap 16 Aug 010/012 Estimated Afr/Ap 17 Aug 009/010 Predicted Afr/Ap 18 Aug-20 Aug 010/012-007/008-006/005
VI. Geomagnetic Activity Probabilities 18 Aug to 20 Aug
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 20% | 15% | 10% |
| Minor storm | 05% | 05% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 20% | 20% | 15% |
| Major-severe storm | 20% | 20% | 10% |
All times in UTC
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