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Solar activity report
Report of Solar-Geophysical Activity 2022 May 18 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 138 Issued at 2200Z on 18 May 2022IA. 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 C4 event observed at
18/1549Z from Region 3014 (N21E17). There are currently 7 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 (19 May, 20 May, 21 May).
IIA. Geophysical Activity Summary 17-2100Z to 18-2100Z
The geomagnetic
field has been at quiet to unsettled levels for the past 24 hours. Solar
wind speed reached a peak of 557 km/s at 17/2207Z. Total IMF reached 6
nT at 18/2045Z. The maximum southward component of Bz reached -3 nT at
17/2350Z. Electrons greater than 2 MeV at geosynchronous orbit reached
a peak level of 164 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to active levels on days one and two (19 May, 20 May) and
quiet to unsettled levels on day three (21 May).
III. Event Probabilities 19 May to 21 May
| Class M | 35% | 30% | 30% |
| Class X | 15% | 15% | 15% |
| Proton | 05% | 05% | 05% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 18 May 180 Predicted 19 May-21 May 180/180/178 90 Day Mean 18 May 122
V. Geomagnetic A Indices
Observed Afr/Ap 17 May 015/013 Estimated Afr/Ap 18 May 008/008 Predicted Afr/Ap 19 May-21 May 010/014-010/012-008/008
VI. Geomagnetic Activity Probabilities 19 May to 21 May
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 30% | 30% | 25% |
| Minor storm | 10% | 10% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 30% | 30% | 30% |
| Major-severe storm | 40% | 40% | 30% |
All times in UTC
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