Report of Solar-Geophysical Activity
Issued: 2009 Apr 02 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 092 Issued at 2200Z on 02 Apr 2009
IA. Analysis of Solar Active Regions and Activity from 01/2100Z
to 02/2100Z: Solar activity was very low. No flares occurred during
the past 24 hours and the solar disk was void of sunspots.
IB. Solar Activity Forecast: Solar activity is expected to be very
low for the next three days (3-5 April).
IIA. Geophysical Activity Summary 01/2100Z to 02/2100Z:
The geomagnetic field was quiet during the past 24 hours.
IIB. Geophysical Activity Forecast: The geomagnetic field is
expected to be quiet to unsettled for 3-4 April in anticipation of a
small increase in solar wind velocity. The increase is forecast
based on recurrence and based on observations of an increase at
Stereo-B on 31 March. The geomagnetic field is expected to be quiet
on the third day (5 April).
III. Event Probabilities 03 Apr-05 Apr
Class M 01/01/01
Class X 01/01/01
Proton 01/01/01
PCAF Green
IV. Penticton 10.7 cm Flux
Observed 02 Apr 071
Predicted 03 Apr-05 Apr 071/071/071
90 Day Mean 02 Apr 070
V. Geomagnetic A Indices
Observed Afr/Ap 01 Apr 003/004
Estimated Afr/Ap 02 Apr 003/005
Predicted Afr/Ap 03 Apr-05 Apr 007/008-007/008-005/005
VI. Geomagnetic Activity Probabilities 03 Apr-05 Apr
A. Middle Latitudes
Active 10/10/05
Minor storm 05/05/01
Major-severe storm 01/01/01
B. High Latitudes
Active 15/15/10
Minor storm 10/10/05
Major-severe storm 01/01/01
For current space weather conditions please refer to:
NOAA Space Weather Scale descriptions can be found at
www.sec.noaa.gov/NOAAscales
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