Viewing archive of Saturday, 4 August 2001
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 2001 Aug 04 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 216 Issued at 2200Z on 04 Aug 2001IA. Analysis of Solar Active Regions and Activity from 03-2100Z to 04-2100Z Solar activity was low. The largest event of the period
was a C9 flare and CME on the SE limb. The associated active region
is just now rotating into view. Region 9563 (N23E05) continues to
grow and produced an impulsive C7/Sf at 04/0949Z. The most
impressive development of the period was the growth in Region 9557
(S21W37). This region developed from an area of approximately 50
millionths of white light area yesterday to nearly 500 millionths
today. The extensive development of the penumbral field appears to
almost encompass the 20+ sunspots. Small C-class activity was also
observed in Region 9566 (N17E22).
IB. Solar Activity Forecast
Solar activity is expected to be low
to moderate. The chance for M-class activity has certainly increased
with the development in Region 9557 and the activity on the SE limb.
Region 9563, which produced an impulsive M1/Sn flare early on 3
July, still has good potential for a low M-class flare.
IIA. Geophysical Activity Summary 03-2100Z to 04-2100Z
The geomagnetic field was quiet to unsettled.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to continue at quiet to unsettled levels. Isolated active
periods are possible at higher latitudes.
III. Event Probabilities 05 Aug to 07 Aug
| Class M | 50% | 50% | 50% |
| Class X | 10% | 10% | 10% |
| Proton | 10% | 10% | 10% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 04 Aug 148 Predicted 05 Aug-07 Aug 155/160/160 90 Day Mean 04 Aug 148
V. Geomagnetic A Indices
Observed Afr/Ap 03 Aug 011/014 Estimated Afr/Ap 04 Aug 008/009 Predicted Afr/Ap 05 Aug-07 Aug 010/018-010/015-010/010
VI. Geomagnetic Activity Probabilities 05 Aug to 07 Aug
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 25% | 25% | 25% |
| Minor storm | 15% | 15% | 15% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 35% | 30% | 30% |
| Minor storm | 20% | 15% | 15% |
| Major-severe storm | 05% | 01% | 01% |
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