Viewing archive of Friday, 19 May 2017
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 2017 May 19 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 19 May 2017IA. Analysis of Solar Active Regions and Activity from 18-2100Z to 19-2100Z Solar activity has been at very low levels for the past 24
hours. There are currently 2 numbered sunspot regions 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 (20
May, 21 May, 22 May).
IIA. Geophysical Activity Summary 18-2100Z to 19-2100Z
The geomagnetic
field has been at quiet to unsettled levels for the past 24 hours. Solar
wind speed reached a peak of 603 km/s at 19/2100Z. Total IMF reached 13
nT at 19/0336Z. The maximum southward component of Bz reached -7 nT at
19/1814Z. Electrons greater than 2 MeV at geosynchronous orbit reached a
peak level of 329 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at unsettled to minor storm levels on day one (20 May) and quiet
to active levels on days two and three (21 May, 22 May).
III. Event Probabilities 20 May to 22 May
| Class M | 01% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 19 May 072 Predicted 20 May-22 May 072/072/074 90 Day Mean 19 May 077
V. Geomagnetic A Indices
Observed Afr/Ap 18 May 015/013 Estimated Afr/Ap 19 May 015/022 Predicted Afr/Ap 20 May-22 May 024/030-016/020-011/012
VI. Geomagnetic Activity Probabilities 20 May to 22 May
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 40% | 20% | 20% |
| Minor storm | 20% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 20% | 15% | 15% |
| Major-severe storm | 15% | 10% | 05% |
All times in UTC
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