Viewing archive of Saturday, 4 May 2019
Solar activity report
Any mentioned solar flare in this report has a scaling factor applied by the Space Weather Prediction Center (SWPC). Because of the SWPC scaling factor, solar flares are reported as 42% smaller than for the science quality data. The scaling factor has been removed from our archived solar flare data to reflect the true physical units.
Report of Solar-Geophysical Activity 2019 May 04 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 124 Issued at 2200Z on 04 May 2019IA. Analysis of Solar Active Regions and Activity from 03-2100Z to 04-2100Z Solar activity has been at low levels for the past 24 hours.
The largest solar event of the period was a C1 event observed at
03/2331Z from Region 2740 (N12E80). There is currently 1 numbered
sunspot region on the disk.
IB. Solar Activity Forecast
Solar activity is expected to be very low
with a slight chance for a C-class flare on days one, two, and three (05
May, 06 May, 07 May).
IIA. Geophysical Activity Summary 03-2100Z to 04-2100Z
The geomagnetic
field has been at quiet to unsettled levels for the past 24 hours. Solar
wind speed reached a peak of 526 km/s at 04/1709Z. Total IMF reached 11
nT at 04/0048Z. The maximum southward component of Bz reached -6 nT at
04/0508Z. Electrons greater than 2 MeV at geosynchronous orbit reached a
peak level of 4753 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to unsettled levels on day one (05 May) and quiet to
active levels on days two and three (06 May, 07 May).
III. Event Probabilities 05 May to 07 May
| Class M | 01% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 04 May 072 Predicted 05 May-07 May 072/074/076 90 Day Mean 04 May 072
V. Geomagnetic A Indices
Observed Afr/Ap 03 May 008/007 Estimated Afr/Ap 04 May 011/012 Predicted Afr/Ap 05 May-07 May 007/008-010/012-012/014
VI. Geomagnetic Activity Probabilities 05 May to 07 May
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 20% | 30% | 30% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 20% | 15% | 15% |
| Minor storm | 30% | 35% | 35% |
| Major-severe storm | 25% | 30% | 30% |
All times in UTC
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