Viewing archive of Thursday, 9 April 2009
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 2009 Apr 09 2201 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 099 Issued at 2200Z on 09 Apr 2009IA. Analysis of Solar Active Regions and Activity from 08-2100Z to 09-2100Z Solar activity was very low. No flares were observed
during the past 24 hours. The solar disk remains spotless.
IB. Solar Activity Forecast
Solar activity is expected to be very
low.
IIA. Geophysical Activity Summary 08-2100Z to 09-2100Z
The geomagnetic field was at quiet to active conditions. The ACE
spacecraft observed a continued rise in solar wind velocity during
the last 24 hours reflecting the arrival of the coronal hole high
speed stream. Wind speeds averaged around 480 km/s with Bz
fluctuations +/- 5 nT.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be at quiet to unsettled levels for 10 April.
Predominantly quiet conditions should return for 11-12 April.
III. Event Probabilities 10 Apr to 12 Apr
| Class M | 01% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | Green | ||
IV. Penticton 10.7 cm Flux
Observed 09 Apr 070 Predicted 10 Apr-12 Apr 070/070/070 90 Day Mean 09 Apr 070
V. Geomagnetic A Indices
Observed Afr/Ap 08 Apr 004/005 Estimated Afr/Ap 09 Apr 009/013 Predicted Afr/Ap 10 Apr-12 Apr 007/008-005/005-005/005
VI. Geomagnetic Activity Probabilities 10 Apr to 12 Apr
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 30% | 05% | 05% |
| Minor storm | 05% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 35% | 10% | 10% |
| Minor storm | 10% | 01% | 01% |
| Major-severe storm | 05% | 01% | 01% |
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