Status Report

NOAA SEC Report of Solar-Geophysical Activity 23 Feb 2002

By SpaceRef Editor
February 23, 2002
Filed under , ,

:Product: Report of Solar-Geophysical Activity
:Issued: 2002 Feb 23 2210 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 054 Issued at 2200Z on 23 Feb 2002
IA. Analysis of Solar Active Regions and Activity from 22/2100Z
to 23/2100Z: Solar activity was low. The largest event of the period
was a C4/Sf at 23/0630Z from developing Region 9841 (S20W33). Region
9830 (S19W49) continues to be the largest and the most active region on
the visible disk, and produced several minor C-class flares. This
region has been in slow decay over the past few days; however, new
flux emergence was noted today and a weak delta configuration still
exists. Minor C-class activity was also observed in Region 9839
(S18W20). New Regions 9844 (N22E33), and 9845 (N15E71) were numbered
IB. Solar Activity Forecast: Solar activity is expected to be low
to moderate. Region 9830 is capable of producing isolated M-class
flares with the slight chance of a major flare.
IIA. Geophysical Activity Summary 22/2100Z to 23/2100Z:
The geomagnetic field was mostly quiet with isolated unsettled
periods early in the period.
IIB. Geophysical Activity Forecast: The geomagnetic field is
expected to continue at quiet to unsettled levels. The minor
geomagnetic disturbance expected today following the 20 Feb CME, has
not yet materialized. It is unlikely that we will see any impact
from this CME.
III. Event Probabilities 24 Feb-26 Feb
Class M 60/55/50
Class X 10/10/05
Proton 10/10/05
PCAF yellow
IV. Penticton 10.7 cm Flux
Observed 23 Feb 188
Predicted 24 Feb-26 Feb 190/185/185
90 Day Mean 23 Feb 223
V. Geomagnetic A Indices
Observed Afr/Ap 22 Feb 006/005
Estimated Afr/Ap 23 Feb 008/010
Predicted Afr/Ap 24 Feb-26 Feb 010/015-007/008-007/008
VI. Geomagnetic Activity Probabilities 24 Feb-26 Feb
A. Middle Latitudes
Active 30/15/15
Minor storm 15/10/10
Major-severe storm 10/05/05
B. High Latitudes
Active 35/20/20
Minor storm 20/10/10
Major-severe storm 10/05/05

SpaceRef staff editor.