Viewing archive of Thursday, 28 September 2023
Solar activity report
Report of Solar-Geophysical Activity 2023 Sep 28 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 271 Issued at 2200Z on 28 Sep 2023IA. Analysis of Solar Active Regions and Activity from 27-2100Z to 28-2100Z 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
28/0907Z from Region 3450 (S19E58). There are currently 7 numbered
sunspot regions on the disk.
IB. Solar Activity Forecast
Solar activity is expected to be low with
a chance for M-class flares on days one, two, and three (29 Sep, 30 Sep,
01 Oct).
IIA. Geophysical Activity Summary 27-2100Z to 28-2100Z
The geomagnetic
field has been at quiet to unsettled levels for the past 24 hours. Solar
wind speed reached a peak of 479 km/s at 28/0135Z. Total IMF reached 8
nT at 28/2054Z. The maximum southward component of Bz reached -4 nT at
28/0236Z. Electrons greater than 2 MeV at geosynchronous orbit reached
a peak level of 1186 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet levels on day one (29 Sep), quiet to active levels on day
two (30 Sep) and quiet to unsettled levels on day three (01 Oct).
III. Event Probabilities 29 Sep to 01 Oct
| Class M | 30% | 30% | 30% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 28 Sep 148 Predicted 29 Sep-01 Oct 148/148/145 90 Day Mean 28 Sep 162
V. Geomagnetic A Indices
Observed Afr/Ap 27 Sep 012/015 Estimated Afr/Ap 28 Sep 006/006 Predicted Afr/Ap 29 Sep-01 Oct 005/005-010/012-008/008
VI. Geomagnetic Activity Probabilities 29 Sep to 01 Oct
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 10% | 30% | 20% |
| Minor storm | 01% | 10% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 15% | 30% | 25% |
| Major-severe storm | 10% | 40% | 25% |
All times in UTC
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| Last M-flare | 2024/11/05 | M2.6 |
| Last geomagnetic storm | 2024/10/12 | Kp5 (G1) |
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| Monthly mean Sunspot Number | |
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