Viewing archive of Wednesday, 1 May 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 May 01 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 121 Issued at 2200Z on 01 May 2002IA. Analysis of Solar Active Regions and Activity from 30-2100Z to 01-2100Z Solar activity was low. Several C-class subflares
occurred with most of them originating in new Region 9932 (S28E56).
So far this area appears to be a fairly small bipolar group just to
the northeast of Region 9927 (S30E43). Region 9926 (N14W29) has
grown since yesterday and has developed some mixed sunspot
polarities. It is just to the east of decaying Region 9919 (N13W40).
Newly numbered sunspot groups include 9930 (N12W17), 9931 (N15E19),
9932 (S28E56), 9933 (N16E64), and 9934 (S18E73). None appear to be
particularly large or complex.
IB. Solar Activity Forecast
Solar activity is expected to be low
to moderate. C-class and low-level M-class flares are possible from
a number of regions, including 9919, 9926, 9927, 9928, 9932, 9933,
and 9934.
IIA. Geophysical Activity Summary 30-2100Z to 01-2100Z
The geomagnetic field was quiet to unsettled. The greater than 10 MeV
proton flux was slightly enhanced (but remaining below the 10 pfu
event threshold) early on 01 May. The enhancement is believed to be
associated with a backside CME visible in LASCO observations.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be quiet to unsettled. The proton flux enhancement from
the backside CME is expected to slowly diminish to background
levels. Geomagnetic activity from this CME is not expected.
III. Event Probabilities 02 May to 04 May
| Class M | 30% | 40% | 50% |
| Class X | 01% | 01% | 05% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 01 May 162 Predicted 02 May-04 May 170/180/185 90 Day Mean 01 May 191
V. Geomagnetic A Indices
Observed Afr/Ap 30 Apr 005/008 Estimated Afr/Ap 01 May 005/006 Predicted Afr/Ap 02 May-04 May 008/012-008/012-008/012
VI. Geomagnetic Activity Probabilities 02 May to 04 May
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 25% | 25% | 25% |
| Minor storm | 10% | 10% | 10% |
| Major-severe storm | 05% | 05% | 05% |
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