Viewing archive of Friday, 23 April 2010
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 2010 Apr 23 2201 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 113 Issued at 2200Z on 23 Apr 2010IA. Analysis of Solar Active Regions and Activity from 22-2100Z to 23-2100Z
Solar activity was very low. No flares were observed
and the visible disk remained spotless. A CME was visible in both
Stereo A and B coronagraphs leaving the sun around 22/00Z with
trajectories suggesting a potentially geoeffective event. SOHO
LASCO data gaps in C2 and C3 imagery prohibit confirmation of a halo at this time.
IB. Solar Activity Forecast
Solar activity is expected to remain
very low for the next 3 days (24-26 April).
IIA. Geophysical Activity Summary 22-2100Z to 23-2100Z
The geomagnetic field was mostly quiet to unsettled, with the
exception of a brief period of minor storming and active conditions
between 00-06Z. This activity was due to elevated solar wind speeds
from a coronal hole and a brief switch to negative polarity.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be quiet for the next 3 days (24-26 April).
III. Event Probabilities 24 Apr to 26 Apr
| Class M | 01% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | Green | ||
IV. Penticton 10.7 cm Flux
Observed 23 Apr 075 Predicted 24 Apr-26 Apr 075/075/080 90 Day Mean 23 Apr 081
V. Geomagnetic A Indices
Observed Afr/Ap 22 Apr 004/006 Estimated Afr/Ap 23 Apr 012/014 Predicted Afr/Ap 24 Apr-26 Apr 005/008-005/005-005/005
VI. Geomagnetic Activity Probabilities 24 Apr to 26 Apr
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 10% | 10% | 10% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 10% | 10% | 10% |
| Major-severe storm | 01% | 01% | 01% |
All times in UTC
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