Viewing archive of Saturday, 11 April 2015
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 2015 Apr 11 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 101 Issued at 2200Z on 11 Apr 2015IA. Analysis of Solar Active Regions and Activity from 10-2100Z to 11-2100Z Solar activity has been at low levels for the past 24 hours.
The largest solar event of the period was a C4 event observed at
11/0241Z from Region 2321 (N12E68). There are currently 5 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
days one, two, and three (12 Apr, 13 Apr, 14 Apr).
IIA. Geophysical Activity Summary 10-2100Z to 11-2100Z
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
408 km/s at 11/1450Z. Total IMF reached 15 nT at 10/2100Z. The maximum
southward component of Bz reached -11 nT at 10/2332Z.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to unsettled levels on day one (12 Apr) and quiet levels
on days two and three (13 Apr, 14 Apr).
III. Event Probabilities 12 Apr to 14 Apr
| Class M | 40% | 40% | 40% |
| Class X | 15% | 15% | 15% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 11 Apr 123 Predicted 12 Apr-14 Apr 130/130/130 90 Day Mean 11 Apr 129
V. Geomagnetic A Indices
Observed Afr/Ap 10 Apr 021/026 Estimated Afr/Ap 11 Apr 017/021 Predicted Afr/Ap 12 Apr-14 Apr 006/008-005/005-005/005
VI. Geomagnetic Activity Probabilities 12 Apr to 14 Apr
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 15% | 05% | 05% |
| Minor storm | 01% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 20% | 15% | 15% |
| Minor storm | 25% | 20% | 20% |
| Major-severe storm | 20% | 10% | 10% |
All times in UTC
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