Viewing archive of Friday, 20 September 2024
Solar activity report
Report of Solar-Geophysical Activity 2024 Sep 20 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 264 Issued at 2200Z on 20 Sep 2024IA. Analysis of Solar Active Regions and Activity from 19-2100Z to 20-2100Z 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
20/1457Z from Region 3831 (N12W09). 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 (21 Sep, 22 Sep,
23 Sep).
IIA. Geophysical Activity Summary 19-2100Z to 20-2100Z
The geomagnetic
field has been at quiet levels for the past 24 hours. Solar wind speed
reached a peak of 485 km/s at 20/0519Z. Total IMF reached 8 nT at
19/2100Z. The maximum southward component of Bz reached -4 nT at
20/2055Z. Electrons greater than 2 MeV at geosynchronous orbit reached
a peak level of 1240 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to unsettled levels on day one (21 Sep) and quiet levels
on days two and three (22 Sep, 23 Sep).
III. Event Probabilities 21 Sep to 23 Sep
| Class M | 30% | 30% | 30% |
| Class X | 05% | 05% | 05% |
| Proton | 05% | 05% | 05% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 20 Sep 154 Predicted 21 Sep-23 Sep 155/150/150 90 Day Mean 20 Sep 215
V. Geomagnetic A Indices
Observed Afr/Ap 19 Sep 015/021 Estimated Afr/Ap 20 Sep 005/005 Predicted Afr/Ap 21 Sep-23 Sep 009/010-007/008-005/005
VI. Geomagnetic Activity Probabilities 21 Sep to 23 Sep
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 20% | 20% | 10% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 25% | 20% | 15% |
| Major-severe storm | 30% | 25% | 15% |
All times in UTC
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Space weather facts
| Last X-flare | 2024/09/14 | X4.54 |
| Last M-flare | 2024/09/22 | M3.7 |
| Last geomagnetic storm | 2024/09/17 | Kp8- (G4) |
| Spotless days | |
|---|---|
| Last spotless day | 2022/06/08 |
| Monthly mean Sunspot Number | |
|---|---|
| August 2024 | 215.5 +19 |
| September 2024 | 144.6 -70.9 |
| Last 30 days | 150.5 -61.8 |