Viewing archive of Thursday, 25 April 2013
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 2013 Apr 25 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 115 Issued at 2200Z on 25 Apr 2013IA. Analysis of Solar Active Regions and Activity from 24-2100Z to 25-2100Z 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
25/1940Z. There are currently 6 numbered sunspot regions on the disk.
IB. Solar Activity Forecast
Solar activity is expected to be low with
a chance for M-class flares on days one, two, and three (26 Apr, 27 Apr,
28 Apr).
IIA. Geophysical Activity Summary 24-2100Z to 25-2100Z
The geomagnetic
field has been at quiet to unsettled levels for the past 24 hours. Solar
wind speed at ACE reached a peak of 619 km/s at 25/2014Z. Total IMF
reached 10 nT at 24/2135Z. The maximum southward component of Bz reached
-6 nT at 24/2109Z. Electrons greater than 2 MeV at geosynchronous orbit
reached a peak flux of 157 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to active levels on day one (26 Apr) and quiet levels on
days two and three (27 Apr, 28 Apr). Protons have a slight chance of
crossing threshold on days one through three (26-28 Apr).
III. Event Probabilities 26 Apr to 28 Apr
| Class M | 40% | 40% | 30% |
| Class X | 15% | 15% | 10% |
| Proton | 15% | 15% | 10% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 25 Apr 119 Predicted 26 Apr-28 Apr 120/120/120 90 Day Mean 25 Apr 112
V. Geomagnetic A Indices
Observed Afr/Ap 24 Apr 015/024 Estimated Afr/Ap 25 Apr 011/011 Predicted Afr/Ap 26 Apr-28 Apr 011/012-006/005-005/005
VI. Geomagnetic Activity Probabilities 26 Apr to 28 Apr
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 15% | 10% | 10% |
| Minor storm | 05% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 25% | 15% | 15% |
| Major-severe storm | 25% | 10% | 10% |
All times in UTC
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