Viewing archive of Wednesday, 28 August 2024
Solar activity report
Report of Solar-Geophysical Activity 2024 Aug 28 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 241 Issued at 2200Z on 28 Aug 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 C7 event observed at
28/2038Z from Region 3801 (N07W17). There are currently 11 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 Aug, 30 Aug, 31 Aug).
IIA. Geophysical Activity Summary 27-2100Z to 28-2100Z
The geomagnetic
field has been at quiet to major storm levels for the past 24 hours.
Solar wind speed reached a peak of 452 km/s at 28/0736Z. Total IMF
reached 17 nT at 28/2100Z. The maximum southward component of Bz reached
-15 nT at 28/0541Z.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to minor storm levels on day one (29 Aug), quiet to
unsettled levels on day two (30 Aug) and quiet levels on day three (31
Aug). Protons have a slight chance of crossing threshold on days one,
two, and three (29 Aug, 30 Aug, 31 Aug).
III. Event Probabilities 29 Aug to 31 Aug
| Class M | 55% | 60% | 60% |
| Class X | 10% | 10% | 10% |
| Proton | 10% | 10% | 10% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 28 Aug 212 Predicted 29 Aug-31 Aug 220/215/215 90 Day Mean 28 Aug 209
V. Geomagnetic A Indices
Observed Afr/Ap 27 Aug 011/009 Estimated Afr/Ap 28 Aug 022/028 Predicted Afr/Ap 29 Aug-31 Aug 013/015-008/008-005/005
VI. Geomagnetic Activity Probabilities 29 Aug to 31 Aug
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 35% | 20% | 10% |
| Minor storm | 25% | 05% | 01% |
| Major-severe storm | 05% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 10% | 15% | 15% |
| Minor storm | 25% | 30% | 20% |
| Major-severe storm | 60% | 25% | 15% |
All times in UTC
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Space weather facts
| Last X-flare | 2024/09/14 | X4.54 |
| Last M-flare | 2024/09/14 | M3.0 |
| 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 | 154.3 -61.2 |
| Last 30 days | 161.6 -51.3 |