Viewing archive of Thursday, 19 September 2024
Solar activity report
Report of Solar-Geophysical Activity 2024 Sep 19 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 263 Issued at 2200Z on 19 Sep 2024IA. Analysis of Solar Active Regions and Activity from 18-2100Z to 19-2100Z Solar activity has been at low levels for the past 24 hours.
The largest solar event of the period was a C2 event observed at
19/1527Z from Region 3825 (S16W21). There are currently 6 numbered
sunspot regions on the disk.
IB. Solar Activity Forecast
Solar activity is expected to be low with
a chance for M-class flares and a slight chance for an X-class flare on
days one, two, and three (20 Sep, 21 Sep, 22 Sep).
IIA. Geophysical Activity Summary 18-2100Z to 19-2100Z
The geomagnetic
field has been at quiet to minor storm levels for the past 24 hours.
Solar wind speed reached a peak of 529 km/s at 19/0836Z. Total IMF
reached 9 nT at 19/0716Z. The maximum southward component of Bz reached
-8 nT at 19/1056Z. Electrons greater than 2 MeV at geosynchronous orbit
reached a peak level of 1227 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet levels on days one and three (20 Sep, 22 Sep) and quiet
to unsettled levels on day two (21 Sep). Protons have a slight chance of
crossing threshold on days one, two, and three (20 Sep, 21 Sep, 22 Sep).
III. Event Probabilities 20 Sep to 22 Sep
| Class M | 45% | 45% | 45% |
| Class X | 10% | 10% | 10% |
| Proton | 10% | 10% | 10% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 19 Sep 161 Predicted 20 Sep-22 Sep 160/155/150 90 Day Mean 19 Sep 216
V. Geomagnetic A Indices
Observed Afr/Ap 18 Sep 010/009 Estimated Afr/Ap 19 Sep 015/021 Predicted Afr/Ap 20 Sep-22 Sep 005/005-009/010-007/008
VI. Geomagnetic Activity Probabilities 20 Sep to 22 Sep
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 10% | 20% | 20% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 15% | 25% | 20% |
| Major-severe storm | 15% | 30% | 25% |
All times in UTC
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Space weather facts
| Last X-flare | 2024/12/08 | X2.2 |
| Last M-flare | 2024/12/21 | M1.9 |
| Last geomagnetic storm | 2024/12/17 | Kp5+ (G1) |
| Spotless days | |
|---|---|
| Last spotless day | 2022/06/08 |
| Monthly mean Sunspot Number | |
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| November 2024 | 152.5 -13.9 |
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| Last 30 days | 114.1 -42.1 |