Joint USAF/NOAA Report of Solar and Geophysical Activity 09 Apr 2009
Product: Report of Solar-Geophysical Activity
Issued: 2009 Apr 09 2200 UTC
Prepared jointly by the U.S. Dept. of Commerce, NOAA,
Space Weather Prediction Center and the U.S. Air Force.
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 099 Issued at 2200Z on 09 Apr 2009
IA. 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-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-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