Viewing archive of Wednesday, 13 April 2011
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 2011 Apr 13 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 103 Issued at 2200Z on 13 Apr 2011IA. Analysis of Solar Active Regions and Activity from 12-2100Z to 13-2100Z
Solar activity was low during the past 24 hours. The
majority of the C-class activity originated from Regions 1191
(N08E56) and 1193 (N17E71). Region 1190 (N12W00) continues to be the
most complex as an Eac-type group with a beta-gamma magnetic
configuration, but has not produced much activity. Region 1193 was
numbered today as it rotated onto the east limb and is a Dao-type
group with a beta magnetic configuration.
IB. Solar Activity Forecast
Solar activity is expected to be low
with the chance for M-class activity increasing during the next
three days (14-16 April) as new Region 1193 continues to rotate onto
the disk.
IIA. Geophysical Activity Summary 12-2100Z to 13-2100Z
The geomagnetic field was unsettled to active with major storm
periods observed at high latitudes during the past 24 hours. The
activity was the result of elevated wind speeds associated with a
coronal hole high speed stream (CH HSS).
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be quiet to unsettled with a chance for isolated active
periods on day one (14 April) due to residual effects from the CH
HSS. Mostly quiet conditions are expected for days two and three
(15-16 April) as the effects from the CH HSS wane.
III. Event Probabilities 14 Apr to 16 Apr
| Class M | 15% | 15% | 15% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | Green | ||
IV. Penticton 10.7 cm Flux
Observed 13 Apr 118 Predicted 14 Apr-16 Apr 120/120/120 90 Day Mean 13 Apr 102
V. Geomagnetic A Indices
Observed Afr/Ap 12 Apr 014/023 Estimated Afr/Ap 13 Apr 012/012 Predicted Afr/Ap 14 Apr-16 Apr 005/005-005/005-005/005
VI. Geomagnetic Activity Probabilities 14 Apr to 16 Apr
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 05% | 05% | 05% |
| Minor storm | 01% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 05% | 05% | 05% |
| Minor storm | 01% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
All times in UTC
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