Joint USAF/NOAA Report of Solar and Geophysical Activity 23 Apr 2009
Product: Report of Solar-Geophysical Activity
Issued: 2009 Apr 23 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 113 Issued at 2200Z on 23 Apr 2009
IA. Analysis of Solar Active Regions and Activity from 22/2100Z to 23/2100Z: Solar activity was very low. No flares were observed. The visible disk was spotless. A prominence disappeared from the northeast limb near N33 during the period. There was a CME associated with the disappearance, but it was not Earth-directed.
IB. Solar Activity Forecast: Solar activity is expected to be very low.
IIA. Geophysical Activity Summary 22/2100Z to 23/2100Z:
Geomagnetic field activity was at quiet levels.
IIB. Geophysical Activity Forecast: Geomagnetic field activity is expected to be at quiet levels during the period (24 – 26 April).
III. Event Probabilities 24 Apr-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 071
Predicted 24 Apr-26 Apr 070/070/070
90 Day Mean 23 Apr 070
V. Geomagnetic A Indices
Observed Afr/Ap 22 Apr 002/004
Estimated Afr/Ap 23 Apr 002/005
Predicted Afr/Ap 24 Apr-26 Apr 005/005-005/005-005/005
VI. Geomagnetic Activity Probabilities 24 Apr-26 Apr
A. Middle Latitudes
Active 05/05/05
Minor storm 01/01/01
Major-severe storm 01/01/01
B. High Latitudes
Active 10/10/05
Minor storm 01/01/01
Major-severe storm 01/01/01