Viewing archive of Sunday, 1 September 2024
Solar activity report
Report of Solar-Geophysical Activity 2024 Sep 01 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 245 Issued at 2200Z on 01 Sep 2024IA. Analysis of Solar Active Regions and Activity from 31-2100Z to 01-2100Z
Solar activity has been at high levels for the past 24 hours.
The largest solar event of the period was a M5 event observed at
01/1322Z. There are currently 10 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
(02 Sep, 03 Sep, 04 Sep).
IIA. Geophysical Activity Summary 31-2100Z to 01-2100Z
The geomagnetic
field has been at quiet to active levels for the past 24 hours. Solar
wind speed reached a peak of 491 km/s at 01/0904Z. Total IMF reached 12
nT at 31/2101Z. The maximum southward component of Bz reached -8 nT at
31/2110Z. Electrons greater than 2 MeV at geosynchronous orbit reached
a peak level of 361 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to unsettled levels on day one (02 Sep) and quiet levels
on days two and three (03 Sep, 04 Sep). Protons have a slight chance of
crossing threshold on days one, two, and three (02 Sep, 03 Sep, 04 Sep).
III. Event Probabilities 02 Sep to 04 Sep
| Class M | 60% | 60% | 60% |
| Class X | 10% | 10% | 10% |
| Proton | 10% | 10% | 10% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 01 Sep 226 Predicted 02 Sep-04 Sep 230/240/245 90 Day Mean 01 Sep 211
V. Geomagnetic A Indices
Observed Afr/Ap 31 Aug 019/027 Estimated Afr/Ap 01 Sep 012/016 Predicted Afr/Ap 02 Sep-04 Sep 007/008-006/005-006/005
VI. Geomagnetic Activity Probabilities 02 Sep to 04 Sep
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 15% | 10% | 10% |
| Minor storm | 01% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 25% | 20% | 20% |
| Major-severe storm | 20% | 15% | 15% |
All times in UTC
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Space weather facts
| Last X-flare | 2025/03/28 | X1.1 |
| Last M-flare | 2025/04/22 | M1.3 |
| Last geomagnetic storm | 2025/04/21 | Kp5+ (G1) |
| Spotless days | |
|---|---|
| Last spotless day | 2022/06/08 |
| Monthly mean Sunspot Number | |
|---|---|
| March 2025 | 134.2 -20.4 |
| April 2025 | 120 -14.2 |
| Last 30 days | 112 -28.2 |