Joint USAF/NOAA Report of Solar and Geophysical Activity 31 Mar 2005
Prepared jointly by the U.S. Dept. of Commerce, NOAA,
Space Environment Center and the U.S. Air Force.
Updated 2005 Mar 31 2200 UTC
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 090 Issued at 2200Z on 31 Mar 2005
IA. Analysis of Solar Active Regions and Activity from 30/2100Z
to 31/2100Z: Solar activity remains at very low levels. Regions 747
(S07E23) and 748 (N09E59) are both HSX alpha spot groups that were
numbered today. Region 745 (N11W80) continues a slow decay and is
now spotless.
IB. Solar Activity Forecast: Solar activity is expected to continue
at very low levels.
IIA. Geophysical Activity Summary 30/2100Z to 31/2100Z:
The geomagnetic field was at quiet to unsettled levels. The greater
than 2 MeV electron flux at geosynchronous orbit reached high levels
today.
IIB. Geophysical Activity Forecast: The geomagnetic field is
expected to be at quiet to unsettled levels through 1 April.
Isolated minor storming conditions are expected late on 2 April due
to the onset of a recurrent coronal hole high speed stream and
should continue through 3 April.
III. Event Probabilities 01 Apr-03 Apr
- Class M 01/01/01
- Class X 01/01/01
- Proton 01/01/01
- PCAF green
IV. Penticton 10.7 cm Flux
- Observed 31 Mar 077
- Predicted 01 Apr-03 Apr 080/085/085
- 90 Day Mean 31 Mar 097
V. Geomagnetic A Indices
- Observed Afr/Ap 30 Mar 006/009
- Estimated Afr/Ap 31 Mar 005/008
- Predicted Afr/Ap 01 Apr-03 Apr 008/010-015/015-015/025
VI. Geomagnetic Activity Probabilities 01 Apr-03 Apr
A. Middle Latitudes
- Active 20/30/30
- Minor storm 05/10/10
- Major-severe storm 01/05/05
B. High Latitudes
- Active 20/30/40
- Minor storm 05/10/20
- Major-severe storm 01/05/10
