Viewing archive of Saturday, 28 September 2024
Solar activity report
Report of Solar-Geophysical Activity 2024 Sep 28 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 272 Issued at 2200Z on 28 Sep 2024IA. Analysis of Solar Active Regions and Activity from 27-2100Z to 28-2100Z Solar activity has been at low levels for the past 24 hours.
The largest solar event of the period was a C3 event observed at
28/0611Z from Region 3835 (S22W15). There are currently 9 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
(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 404 km/s at 27/2118Z. Total IMF reached 9
nT at 28/1026Z. The maximum southward component of Bz reached -7 nT at
28/0839Z. Electrons greater than 2 MeV at geosynchronous orbit reached
a peak level of 467 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to active levels on day one (29 Sep), quiet to unsettled
levels on day two (30 Sep) and quiet levels on day three (01 Oct).
III. Event Probabilities 29 Sep to 01 Oct
| Class M | 55% | 55% | 55% |
| Class X | 10% | 10% | 10% |
| Proton | 05% | 05% | 05% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 28 Sep 195 Predicted 29 Sep-01 Oct 195/195/195 90 Day Mean 28 Sep 214
V. Geomagnetic A Indices
Observed Afr/Ap 27 Sep 005/008 Estimated Afr/Ap 28 Sep 004/004 Predicted Afr/Ap 29 Sep-01 Oct 009/010-008/008-005/005
VI. Geomagnetic Activity Probabilities 29 Sep to 01 Oct
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 30% | 20% | 10% |
| Minor storm | 10% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 30% | 25% | 15% |
| Major-severe storm | 40% | 25% | 15% |
All times in UTC
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Space weather facts
| Last X-flare | 2024/12/08 | X2.2 |
| Last M-flare | 2024/12/22 | M1.0 |
| Last geomagnetic storm | 2024/12/17 | Kp5+ (G1) |
| Spotless days | |
|---|---|
| Last spotless day | 2022/06/08 |
| Monthly mean Sunspot Number | |
|---|---|
| November 2024 | 152.5 -13.9 |
| December 2024 | 103.3 -49.2 |
| Last 30 days | 115.4 -40.8 |