Viewing archive of Friday, 25 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 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 2014IA. Analysis of Solar Active Regions and Activity from 24-2100Z to 25-2100Z Solar activity has been at high levels for the past 24 hours.
The largest solar event of the period was a X1 event observed at
25/0027Z from Region 2035, which rotated off of the solar disk on 23
April. There are currently 5 numbered sunspot regions on the disk.
IB. Solar Activity Forecast
Solar activity is likely to be low with a
slight chance for an M-class flare on day one (26 Apr) and expected to
be very low with a chance for a C-class flares and a slight chance for
an M-class flare on day two (27 Apr) and expected to be very low with a
chance for a C-class flares on day three (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, as measured by the ACE spacecraft, reached a peak speed of
540 km/s at 24/2300Z. Total IMF reached 5 nT at 24/2105Z. The maximum
southward component of Bz reached -5 nT at 24/2227Z. Electrons greater
than 2 MeV at geosynchronous orbit reached a peak level of 1075 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet levels on days one, two, and three (26 Apr, 27 Apr, 28
Apr).
III. Event Probabilities 26 Apr to 28 Apr
| Class M | 20% | 15% | 05% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 25 Apr 125 Predicted 26 Apr-28 Apr 120/118/115 90 Day Mean 25 Apr 156
V. Geomagnetic A Indices
Observed Afr/Ap 24 Apr 008/010 Estimated Afr/Ap 25 Apr 008/008 Predicted Afr/Ap 26 Apr-28 Apr 006/005-006/005-006/005
VI. Geomagnetic Activity Probabilities 26 Apr to 28 Apr
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 05% | 05% | 05% |
| Minor storm | 01% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 15% | 15% | 15% |
| Major-severe storm | 05% | 05% | 05% |
All times in UTC
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