Viewing archive of Monday, 11 September 2023

Solar activity report

Report of Solar-Geophysical Activity 2023 Sep 11 2200 UTC
Prepared by the NOAA © SWPC and processed by SpaceWeatherLive.com

Joint USAF/NOAA Report of Solar and Geophysical Activity

SDF Number 254 Issued at 2200Z on 11 Sep 2023

IA. Analysis of Solar Active Regions and Activity from 10-2100Z to 11-2100Z

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 11/0128Z from Region 3429 (N10E46). There are currently 10 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 (12 Sep, 13 Sep, 14 Sep).
IIA. Geophysical Activity Summary 10-2100Z to 11-2100Z
The geomagnetic field has been at quiet levels for the past 24 hours. Solar wind speed reached a peak of 429 km/s at 11/1902Z. Total IMF reached 8 nT at 11/0133Z. The maximum southward component of Bz reached -6 nT at 11/0038Z. Electrons greater than 2 MeV at geosynchronous orbit reached a peak level of 174 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected to be at quiet to active levels on days one and two (12 Sep, 13 Sep) and quiet to unsettled levels on day three (14 Sep). Protons greater than 10 Mev have a slight chance of crossing threshold on day three (14 Sep).
III. Event Probabilities 12 Sep to 14 Sep
Class M55%55%55%
Class X10%10%10%
Proton05%05%10%
PCAFgreen
IV. Penticton 10.7 cm Flux
  Observed       11 Sep 176
  Predicted   12 Sep-14 Sep 175/170/168
  90 Day Mean        11 Sep 163

V. Geomagnetic A Indices
  Observed Afr/Ap 10 Sep  006/003
  Estimated     Afr/Ap 11 Sep  007/007
  Predicted    Afr/Ap 12 Sep-14 Sep  011/015-011/012-009/010

VI. Geomagnetic Activity Probabilities 12 Sep to 14 Sep
A. Middle Latitudes
Active35%30%20%
Minor storm10%05%05%
Major-severe storm01%01%01%
B. High Latitudes
Active25%25%15%
Minor storm30%25%20%
Major-severe storm20%20%20%

All times in UTC

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