Viewing archive of Thursday, 30 September 2021
Solar activity report
Report of Solar-Geophysical Activity 2021 Sep 30 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 273 Issued at 2200Z on 30 Sep 2021IA. Analysis of Solar Active Regions and Activity from 29-2100Z to 30-2100Z 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
29/2156Z from Region 2877 (S16W40). There are currently 2 numbered
sunspot regions on the disk.
IB. Solar Activity Forecast
Solar activity is expected to be very low
with a chance for a C-class flares and a slight chance for an M-class
flare on days one, two, and three (01 Oct, 02 Oct, 03 Oct).
IIA. Geophysical Activity Summary 29-2100Z to 30-2100Z
The geomagnetic
field has been at quiet levels for the past 24 hours. Solar wind speed
reached a peak of 504 km/s at 30/2050Z. Total IMF reached 14 nT at
30/1818Z. The maximum southward component of Bz reached -9 nT at
30/1811Z. Electrons greater than 2 MeV at geosynchronous orbit reached
a peak level of 616 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to minor storm levels on day one (01 Oct), quiet to
active levels on day two (02 Oct) and quiet to unsettled levels on day
three (03 Oct).
III. Event Probabilities 01 Oct to 03 Oct
| Class M | 10% | 10% | 10% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 30 Sep 095 Predicted 01 Oct-03 Oct 095/095/095 90 Day Mean 30 Sep 082
V. Geomagnetic A Indices
Observed Afr/Ap 29 Sep 004/004 Estimated Afr/Ap 30 Sep 009/011 Predicted Afr/Ap 01 Oct-03 Oct 018/024-008/010-008/008
VI. Geomagnetic Activity Probabilities 01 Oct to 03 Oct
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 45% | 40% | 25% |
| Minor storm | 30% | 20% | 05% |
| Major-severe storm | 05% | 05% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 05% | 10% | 15% |
| Minor storm | 20% | 30% | 25% |
| Major-severe storm | 70% | 60% | 30% |
All times in UTC
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