Viewing archive of Friday, 27 October 2023
Solar activity report
Report of Solar-Geophysical Activity 2023 Oct 27 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 300 Issued at 2200Z on 27 Oct 2023IA. Analysis of Solar Active Regions and Activity from 26-2100Z to 27-2100Z 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
26/2324Z. There are currently 5 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 (28 Oct, 29 Oct, 30 Oct).
IIA. Geophysical Activity Summary 26-2100Z to 27-2100Z
The geomagnetic
field has been at quiet to minor storm levels for the past 24 hours.
Solar wind speed reached a peak of 556 km/s at 26/2100Z. Total IMF
reached 11 nT at 27/0430Z. The maximum southward component of Bz reached
-9 nT at 27/0406Z. Electrons greater than 2 MeV at geosynchronous orbit
reached a peak level of 307 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to unsettled levels on day one (28 Oct), quiet to active
levels on day two (29 Oct) and unsettled to minor storm levels on day
three (30 Oct).
III. Event Probabilities 28 Oct to 30 Oct
| Class M | 10% | 10% | 10% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 27 Oct 128 Predicted 28 Oct-30 Oct 128/130/130 90 Day Mean 27 Oct 151
V. Geomagnetic A Indices
Observed Afr/Ap 26 Oct 018/023 Estimated Afr/Ap 27 Oct 014/016 Predicted Afr/Ap 28 Oct-30 Oct 009/008-009/012-016/025
VI. Geomagnetic Activity Probabilities 28 Oct to 30 Oct
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 15% | 30% | 40% |
| Minor storm | 05% | 10% | 30% |
| Major-severe storm | 01% | 01% | 05% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 10% |
| Minor storm | 20% | 25% | 25% |
| Major-severe storm | 20% | 40% | 65% |
All times in UTC
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