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Solar activity report
Report of Solar-Geophysical Activity 2024 May 18 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 139 Issued at 2200Z on 18 May 2024IA. Analysis of Solar Active Regions and Activity from 17-2100Z to 18-2100Z 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
18/0538Z from Region 3679 (S08W07). There are currently 9 numbered
sunspot regions on the disk.
IB. Solar Activity Forecast
Solar activity is likely to be moderate
with a chance for X-class flares on days one, two, and three (19 May, 20
May, 21 May).
IIA. Geophysical Activity Summary 17-2100Z to 18-2100Z
The geomagnetic
field has been at quiet to minor storm levels for the past 24 hours.
Solar wind speed reached a peak of 517 km/s at 17/2145Z. Total IMF
reached 11 nT at 17/2213Z. The maximum southward component of Bz reached
-9 nT at 17/2203Z. Electrons greater than 2 MeV at geosynchronous orbit
reached a peak level of 222 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to active levels on day one (19 May), quiet to minor
storm levels on day two (20 May) and unsettled to active levels on day
three (21 May). Protons have a slight chance of crossing threshold on
days one, two, and three (19 May, 20 May, 21 May).
III. Event Probabilities 19 May to 21 May
| Class M | 55% | 55% | 55% |
| Class X | 25% | 25% | 25% |
| Proton | 10% | 10% | 10% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 18 May 194 Predicted 19 May-21 May 195/200/200 90 Day Mean 18 May 167
V. Geomagnetic A Indices
Observed Afr/Ap 17 May 016/028 Estimated Afr/Ap 18 May 010/012 Predicted Afr/Ap 19 May-21 May 013/018-016/024-014/016
VI. Geomagnetic Activity Probabilities 19 May to 21 May
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 35% | 40% | 30% |
| Minor storm | 15% | 25% | 10% |
| Major-severe storm | 01% | 05% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 10% | 05% | 15% |
| Minor storm | 25% | 20% | 25% |
| Major-severe storm | 50% | 65% | 40% |
All times in UTC
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Space weather facts
| Last X-flare | 2024/12/08 | X2.2 |
| Last M-flare | 2024/12/28 | M1.2 |
| Last geomagnetic storm | 2024/12/17 | Kp5+ (G1) |
| Spotless days | |
|---|---|
| Last spotless day | 2022/06/08 |
| Monthly mean Sunspot Number | |
|---|---|
| November 2024 | 152.5 -13.9 |
| December 2024 | 126.9 -25.6 |
| Last 30 days | 126 -23.4 |