Viewing archive of Monday, 21 April 2014
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 2014 Apr 21 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 111 Issued at 2200Z on 21 Apr 2014IA. Analysis of Solar Active Regions and Activity from 20-2100Z to 21-2100Z
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
21/2002Z from Region 2038 (S10W20). There are currently 8 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
day one (22 Apr) and expected to be low with a chance for M-class flares
on days two and three (23 Apr, 24 Apr).
IIA. Geophysical Activity Summary 20-2100Z to 21-2100Z
The geomagnetic
field has been at quiet to active levels for the past 24 hours. Solar
wind speed, as measured by the ACE spacecraft, reached a peak speed of
711 km/s at 20/2206Z. Total IMF reached 12 nT at 20/2126Z. The maximum
southward component of Bz reached -7 nT at 21/0030Z.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to active levels on day one (22 Apr) and quiet to
unsettled levels on days two and three (23 Apr, 24 Apr). Protons greater
than 10 Mev have a slight chance of crossing threshold on day one (22
Apr).
III. Event Probabilities 22 Apr to 24 Apr
| Class M | 50% | 40% | 30% |
| Class X | 10% | 05% | 01% |
| Proton | 10% | 05% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 21 Apr 159 Predicted 22 Apr-24 Apr 160/150/150 90 Day Mean 21 Apr 156
V. Geomagnetic A Indices
Observed Afr/Ap 20 Apr 020/021 Estimated Afr/Ap 21 Apr 014/017 Predicted Afr/Ap 22 Apr-24 Apr 014/015-007/008-007/008
VI. Geomagnetic Activity Probabilities 22 Apr to 24 Apr
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 30% | 20% | 20% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 30% | 30% | 30% |
| Major-severe storm | 35% | 25% | 25% |
All times in UTC
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