Viewing archive of Monday, 16 September 2024
Solar activity report
Report of Solar-Geophysical Activity 2024 Sep 16 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 260 Issued at 2200Z on 16 Sep 2024IA. Analysis of Solar Active Regions and Activity from 15-2100Z to 16-2100Z Solar activity has been at low levels for the past 24 hours.
The largest solar event of the period was a C5 event observed at
16/0125Z from Region 3824 (S04W40). There are currently 7 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 (17 Sep) and
expected to be low with a chance for M-class flares and a slight chance
for an X-class flare on days two and three (18 Sep, 19 Sep).
IIA. Geophysical Activity Summary 15-2100Z to 16-2100Z
The geomagnetic
field has been at quiet to active levels for the past 24 hours. Solar
wind speed reached a peak of 580 km/s at 16/0606Z. Total IMF reached 10
nT at 16/0947Z. The maximum southward component of Bz reached -9 nT at
16/0932Z. Protons greater than 10 MeV at geosynchronous orbit reached a
peak level of 4 pfu at 15/2150Z. Electrons greater than 2 MeV at
geosynchronous orbit reached a peak level of 2241 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to major storm levels on day one (17 Sep) and quiet to
unsettled levels on days two and three (18 Sep, 19 Sep). Protons have a
slight chance of crossing threshold on day one (17 Sep), have a slight
chance of crossing threshold on day two (18 Sep) and have a slight
chance of crossing threshold on day three (19 Sep).
III. Event Probabilities 17 Sep to 19 Sep
| Class M | 55% | 45% | 40% |
| Class X | 15% | 10% | 10% |
| Proton | 20% | 15% | 10% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 16 Sep 170 Predicted 17 Sep-19 Sep 170/170/170 90 Day Mean 16 Sep 217
V. Geomagnetic A Indices
Observed Afr/Ap 15 Sep 016/020 Estimated Afr/Ap 16 Sep 022/027 Predicted Afr/Ap 17 Sep-19 Sep 019/028-007/010-007/008
VI. Geomagnetic Activity Probabilities 17 Sep to 19 Sep
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 30% | 30% | 20% |
| Minor storm | 35% | 15% | 05% |
| Major-severe storm | 25% | 05% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 05% | 15% | 15% |
| Minor storm | 15% | 30% | 20% |
| Major-severe storm | 80% | 50% | 25% |
All times in UTC
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Space weather facts
| Last X-flare | 2024/12/08 | X2.2 |
| Last M-flare | 2024/12/22 | M1.0 |
| Last geomagnetic storm | 2024/12/17 | Kp5+ (G1) |
| Spotless days | |
|---|---|
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| Monthly mean Sunspot Number | |
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| November 2024 | 152.5 -13.9 |
| December 2024 | 103.3 -49.2 |
| Last 30 days | 115.4 -40.8 |