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Solar activity report

Report of Solar-Geophysical Activity 2023 Sep 23 2200 UTC
Prepared by the NOAA © SWPC and processed by SpaceWeatherLive.com

Joint USAF/NOAA Report of Solar and Geophysical Activity

SDF Number 266 Issued at 2200Z on 23 Sep 2023

IA. Analysis of Solar Active Regions and Activity from 22-2100Z to 23-2100Z

Solar activity has been at moderate levels for the past 24 hours. The largest solar event of the period was a M1 event observed at 22/2300Z from Region 3443 (N28W40). There are currently 12 numbered sunspot regions on the disk.
IB. Solar Activity Forecast
Solar activity is likely to be moderate with a slight chance for an X-class flare on days one, two, and three (24 Sep, 25 Sep, 26 Sep).
IIA. Geophysical Activity Summary 22-2100Z to 23-2100Z
The geomagnetic field has been at quiet to unsettled levels for the past 24 hours. Solar wind speed reached a peak of 395 km/s at 23/0034Z. Total IMF reached 5 nT at 23/1008Z. The maximum southward component of Bz reached -5 nT at 23/1717Z. Electrons greater than 2 MeV at geosynchronous orbit reached a peak level of 2394 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected to be at quiet to minor storm levels on day one (24 Sep) and quiet to active levels on days two and three (25 Sep, 26 Sep). Protons have a slight chance of crossing threshold on days one, two, and three (24 Sep, 25 Sep, 26 Sep).
III. Event Probabilities 24 Sep to 26 Sep
Class M60%60%60%
Class X15%15%15%
Proton10%10%10%
PCAFgreen
IV. Penticton 10.7 cm Flux
  Observed       23 Sep 173
  Predicted   24 Sep-26 Sep 175/172/168
  90 Day Mean        23 Sep 162

V. Geomagnetic A Indices
  Observed Afr/Ap 22 Sep  007/010
  Estimated     Afr/Ap 23 Sep  010/010
  Predicted    Afr/Ap 24 Sep-26 Sep  018/022-013/015-009/012

VI. Geomagnetic Activity Probabilities 24 Sep to 26 Sep
A. Middle Latitudes
Active35%25%20%
Minor storm20%05%05%
Major-severe storm05%01%01%
B. High Latitudes
Active15%15%15%
Minor storm20%20%20%
Major-severe storm30%25%20%

All times in UTC

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