NOAA SEC Report of Solar-Geophysical Activity – 2 Oct 2001
:Product: Report of Solar-Geophysical Activity
:Issued: 2001 Oct 02 2220 UT
# Prepared jointly by the U.S. Dept. of Commerce, NOAA,
#Space Environment Center and the U.S. Air Force.
#
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 275 Issued at 2200Z on 02 Oct 2001
IA. Analysis of Solar Active Regions and Activity from 01/2100Z
to 02/2100Z: Solar activity was moderate with 3 M-class flares and
3 C-class flares. A M1.2/SF occurred in Region 9632 (S21W89) at
01/2340 UTC and a M1.0/SF in Region 9641 (S14E07) at 02/1123 UTC. A
M1.4 occurred with no optical correlation. Two new regions were
numbered today, Region 9647 (S16E31) and Region 9648 (S04E78).
IB. Solar Activity Forecast: Solar activity is expected to remain
at moderate to high levels. Region 9632(S21W89) has major flare
potential for the first day of the period. Region 9636 (N14W41)
remains a beta-Gamma configuration and has M-class flare potential.
Old Region 9608 is due to return on the first day of the period as
Region 9632 rotates beyond the west limb.
IIA. Geophysical Activity Summary 01/2100Z to 02/2100Z:
Geomagnetic activity reached minor storm level. The greater than 10
MeV proton flux peaked at 2360 PFU 02/0810 UTC. Flux levels
declined over the remainder of the period, but remained at event
levels.
IIB. Geophysical Activity Forecast: Geomagnetic activity is
expected to be quiet to unsettled with isolated active periods
possible. Analyst of the CME that occurred at 01/0530 UTC indicates
it was likely a backside event and will have limited impact. The
greater than 10 MeV proton event is expected to end early in the
period.
III. Event Probabilities 03 Oct-05 Oct
Class M 75/75/70
Class X 20/20/15
Proton 15/10/05
PCAF yellow
IV. Penticton 10.7 cm Flux
Observed 02 Oct 201
Predicted 03 Oct-05 Oct 205/195/190
90 Day Mean 02 Oct 178
V. Geomagnetic A Indices
Observed Afr/Ap 01 Oct 025/050
Estimated Afr/Ap 02 Oct 025/040
Predicted Afr/Ap 03 Oct-05 Oct 015/020-015/040-010/015
VI. Geomagnetic Activity Probabilities 03 Oct-05 Oct
A. Middle Latitudes
Active 50/40/15
Minor storm 30/20/05
Major-severe storm 15/05/01
B. High Latitudes
Active 60/40/25
Minor storm 30/25/15
Major-severe storm 10/10/05