Joint USAF/NOAA Report of Solar and Geophysical Activity 27 Apr 2009

Product: Report of Solar-Geophysical Activity
Issued: 2009 Apr 27 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 117 Issued at 2200Z on 27 Apr 2009

IA. Analysis of Solar Active Regions and Activity from 26/2100Z
to 27/2100Z: Solar activity was very low. No flares were observed.
The visible disk remained spotless.

IB. Solar Activity Forecast: Solar activity is expected to be very
low.

IIA. Geophysical Activity Summary 26/2100Z to 27/2100Z:
The geomagnetic field was at quiet levels.

IIB. Geophysical Activity Forecast: The geomagnetic field is
expected to be at quiet levels through the forecast period (28 – 30
April).

III. Event Probabilities 28 Apr-30 Apr
Class M 01/01/01
Class X 01/01/01
Proton 01/01/01
PCAF green

IV. Penticton 10.7 cm Flux
Observed 27 Apr 068
Predicted 28 Apr-30 Apr 070/070/070
90 Day Mean 27 Apr 070

V. Geomagnetic A Indices
Observed Afr/Ap 26 Apr 003/005
Estimated Afr/Ap 27 Apr 003/005
Predicted Afr/Ap 28 Apr-30 Apr 005/005-005/005-005/005

VI. Geomagnetic Activity Probabilities 28 Apr-30 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