Viewing archive of Friday, 4 August 2023
Solar activity report
Report of Solar-Geophysical Activity 2023 Aug 04 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 216 Issued at 2200Z on 04 Aug 2023IA. Analysis of Solar Active Regions and Activity from 03-2100Z to 04-2100Z 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
04/0424Z from Region 3386 (N11W62). 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 day one (05 Aug) and
expected to be low with a chance for M-class flares on days two and
three (06 Aug, 07 Aug).
IIA. Geophysical Activity Summary 03-2100Z to 04-2100Z
The geomagnetic
field has been at quiet to active levels for the past 24 hours. Solar
wind speed reached a peak of 494 km/s at 04/0620Z. Total IMF reached 16
nT at 04/0824Z. The maximum southward component of Bz reached -12 nT at
04/1635Z.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at unsettled to minor storm levels on day one (05 Aug) and quiet
to active levels on days two and three (06 Aug, 07 Aug). Protons greater
than 10 Mev have a slight chance of crossing threshold on day one (05
Aug).
III. Event Probabilities 05 Aug to 07 Aug
| Class M | 55% | 35% | 35% |
| Class X | 10% | 05% | 05% |
| Proton | 10% | 05% | 05% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 04 Aug 171 Predicted 05 Aug-07 Aug 165/162/164 90 Day Mean 04 Aug 166
V. Geomagnetic A Indices
Observed Afr/Ap 03 Aug NA/008 Estimated Afr/Ap 04 Aug 010/015 Predicted Afr/Ap 05 Aug-07 Aug 020/028-013/015-009/012
VI. Geomagnetic Activity Probabilities 05 Aug to 07 Aug
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 35% | 35% | 20% |
| Minor storm | 30% | 15% | 05% |
| Major-severe storm | 10% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 20% | 15% |
| Minor storm | 25% | 30% | 20% |
| Major-severe storm | 50% | 30% | 20% |
All times in UTC
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Space weather facts
| Last X-flare | 2024/11/06 | X2.3 |
| Last M-flare | 2024/11/07 | M1.4 |
| Last geomagnetic storm | 2024/10/12 | Kp5 (G1) |
| Spotless days | |
|---|---|
| Last spotless day | 2022/06/08 |
| Monthly mean Sunspot Number | |
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| October 2024 | 166.4 +25 |
| November 2024 | 194.5 +28.1 |
| Last 30 days | 160.2 +7.5 |