Viewing archive of Saturday, 6 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 06 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 096 Issued at 2200Z on 06 Apr 2002IA. Analysis of Solar Active Regions and Activity from 05-2100Z to 06-2100Z Solar activity was at low levels. Region 9893 (N19E40)
produced the largest flare during the period, a C9/1F flare
occurring at 06/0619 UTC. This region has become slightly more
complex during the period and has also seen an increase in penumbral
coverage. Many minor C-class flares from the more ominous regions
were seen on the disk today as well. One worthy of mention, a C2/Sf
flare that materialized from an area void of spots (S17E48) also
produced a weak Type II sweep with an estimated shock velocity of
296 km/s. LASCO imagery doesn't depict any geoeffective potential
to this event. New Regions 9897 (S01W02), 9898 (S19E66), and 9899
(N18E72) were numbered today.
IB. Solar Activity Forecast
Solar activity is expected to be at
low to moderate levels. A chance for an isolated major flare exists
due to the magnetic complexity seen in several regions.
IIA. Geophysical Activity Summary 05-2100Z to 06-2100Z
The geomagnetic field activity was at quiet levels.
IIB. Geophysical Activity Forecast
Geomagnetic field activity is
expected to be quiet on day one of the forecast. A slight chance of
isolated active conditions exist for days two and three. The
greater than 2 MeV electron flux dropped below event levels at
05/2140 UTC (max flux 2140 pfu's at 05/1725 UTC) , although levels
remain elevated at the time of this writing.
III. Event Probabilities 07 Apr to 09 Apr
| Class M | 60% | 60% | 60% |
| Class X | 10% | 10% | 10% |
| Proton | 05% | 05% | 05% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 06 Apr 206 Predicted 07 Apr-09 Apr 205/200/190 90 Day Mean 06 Apr 203
V. Geomagnetic A Indices
Observed Afr/Ap 05 Apr 003/006 Estimated Afr/Ap 06 Apr 004/006 Predicted Afr/Ap 07 Apr-09 Apr 010/010-012/012-008/010
VI. Geomagnetic Activity Probabilities 07 Apr to 09 Apr
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 15% | 20% | 20% |
| Minor storm | 01% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 25% | 25% |
| Minor storm | 01% | 10% | 10% |
| Major-severe storm | 01% | 01% | 01% |
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