Joint USAF/NOAA Report of Solar and Geophysical Activity 19 Aug 2002
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 231 Issued at 2200Z on 19 Aug 2002
IA. Analysis of Solar Active Regions and Activity from 18/2100Z
to 19/2100Z: Solar activity was at moderate levels. Region 69
(S08W30) produced an M2/Sf at 19/1034 UTC. Region 69 remains
relatively unchanged with multiple magnetic delta configurations.
Further developments of the M2.2/1b at 18/2125 UTC mentioned in
yesterday's forecast indicates a partial halo CME, Type II (860
km/s) and Type IV radio sweeps. Region 79 (S22W08) continues to
show gradual growth. New Region 85 (S11E69) was numbered today.
IB. Solar Activity Forecast: Solar activity is expected to be
moderate to high. Region 69 has the potential for major flare
activity.
IIA. Geophysical Activity Summary 18/2100Z to 19/2100Z:
The geomagnetic field was at unsettled to minor storming levels.
Minor storming occurred early in the summary period. A sustained
northern Bz began at around 19/0800 UTC bringing unsettled to active
conditions.
IIB. Geophysical Activity Forecast: The geomagnetic field is
expected to be quiet to unsettled.
III. Event Probabilities 20 Aug-22 Aug
Class M 75/75/75
Class X 20/20/20
Proton 15/15/15
PCAF yellow
IV. Penticton 10.7 cm Flux
Observed 19 Aug 237
Predicted 20 Aug-22 Aug 245/240/230
90 Day Mean 19 Aug 168
V. Geomagnetic A Indices
Observed Afr/Ap 18 Aug 015/018
Estimated Afr/Ap 19 Aug 021/025
Predicted Afr/Ap 20 Aug-22 Aug 012/012-010/010-012/012
VI. Geomagnetic Activity Probabilities 20 Aug-22 Aug
A. Middle Latitudes
Active 30/20/25
Minor storm 15/05/10
Major-severe storm 05/01/01
B. High Latitudes
Active 30/25/30
Minor storm 15/10/15
Major-severe storm 10/01/05