Viewing archive of Friday, 12 April 2002
Solar activity report
Any mentioned solar flare in this report has a scaling factor applied by the Space Weather Prediction Center (SWPC). Because of the SWPC scaling factor, solar flares are reported as 42% smaller than for the science quality data. The scaling factor has been removed from our archived solar flare data to reflect the true physical units.
Report of Solar-Geophysical Activity 2002 Apr 12 2200 UTC
Prepared by the NOAA © SWPC and processed by SpaceWeatherLive.comJoint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 102 Issued at 2200Z on 12 Apr 2002
IA. Analysis of Solar Active Regions and Activity from 11-2100Z to 12-2100Z
Solar activity was at moderate levels. Region 9901
(N21W26) produced an M4/1F flare on 12/1802 UTC with an associated
Type IV Radio Sweep. Region 9893 (N20W39) has developed a delta
magnetic configuration in the trailing spot and has increased in
area and spot count. LASCO/EIT imagery indicates that Region 9893
is the most likely source of an optically uncorrelated M1.4 flare
that occurred on 12/1310 UTC. Region 9906 (S16E26) has shown rapid
growth in spot count, area, and now has a beta-gamma magnetic
configuration. This region also shows some indication of a
developing delta magnetic configuration. As Region 9907 (S05E61)
rotates onto the disk it has revealed a moderate size spot group and
a beta-gamma magnetic classification. One new region was numbered
today: Region 9908 (N05W25).
IB. Solar Activity Forecast
Solar activity is expected to be
moderate. Region 9893/9901 complex has been active and has two
delta configurations. The potential for M-class events is good.
Region 9906 and 9907 are developing and have a slight chance of
M-class events.
IIA. Geophysical Activity Summary 11-2100Z to 12-2100Z
The geomagnetic field was at quiet to unsettled levels with one 3
hour period of minor storm conditions. This isolated minor storm
condition coincided with a sector boundary crossing. At the time of
this issue the NASA/ACE EPAM data have shown a steady increase in
low energy protons possibly due to expected CME shock.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be quiet to active. A CME shock is expected midday on
day one of the forecast period. A second shock expected midday on
day two of the forecast period.
III. Event Probabilities 13 Apr to 15 Apr
Class M | 65% | 65% | 60% |
Class X | 10% | 10% | 10% |
Proton | 10% | 10% | 05% |
PCAF | yellow
|
IV. Penticton 10.7 cm Flux
Observed 12 Apr 212
Predicted 13 Apr-15 Apr 210/210/205
90 Day Mean 12 Apr 202
V. Geomagnetic A Indices
Observed Afr/Ap 11 Apr 010/013
Estimated Afr/Ap 12 Apr 014/015
Predicted Afr/Ap 13 Apr-15 Apr 015/015-015/020-010/015
VI. Geomagnetic Activity Probabilities 13 Apr to 15 Apr
A. Middle Latitudes |
Active | 25% | 30% | 30% |
Minor storm | 10% | 15% | 15% |
Major-severe storm | 05% | 05% | 05% |
B. High Latitudes |
Active | 25% | 30% | 30% |
Minor storm | 10% | 15% | 15% |
Major-severe storm | 05% | 05% | 05% |
All times in UTC
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