Viewing archive of Monday, 13 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 13 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 225 Issued at 2200Z on 13 Aug 2001IA. Analysis of Solar Active Regions and Activity from 12-2100Z to 13-2100Z Solar activity has been low. Most flare activity was
optically uncorrelated, including the largest event, a C4.6 flare at
13/1405 UTC. Region 9574 (S05W38) produced the only optically
correlated event for the period, a C1/Sf at 13/1921 UTC. This
region has exhibited a moderate increase in magnetic complexity, and
is currently the largest active region on the disk, now in an
Eki/beta-gamma configuration with 20 spots and 370 millionths areal
coverage.
IB. Solar Activity Forecast
Solar activity is expected to be low
to moderate. Region 9574 is a potential source of isolated
moderate-level flare activity.
IIA. Geophysical Activity Summary 12-2100Z to 13-2100Z
The geomagnetic field has been at unsettled to minor storm levels,
due to the ongoing influence of yesterday's shock passage from the
CME activity of 09 August. Some additional influence from a weak
high speed stream appears to have also developed over the past 12
hours, with mainly unsettled conditions occurring over that period.
IIB. Geophysical Activity Forecast
Geomagnetic field activity is
expected to be unsettled to active for the next 24 hours, then
tapering off to quiet to unsettled conditions thereafter, as the
combined influence of CME passage and weak high speed stream effects
wane during the course of the period.
III. Event Probabilities 14 Aug to 16 Aug
| Class M | 30% | 30% | 30% |
| Class X | 05% | 05% | 05% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 13 Aug 152 Predicted 14 Aug-16 Aug 150/145/140 90 Day Mean 13 Aug 151
V. Geomagnetic A Indices
Observed Afr/Ap 12 Aug 011/014 Estimated Afr/Ap 13 Aug 020/020 Predicted Afr/Ap 14 Aug-16 Aug 015/015-012/010-010/010
VI. Geomagnetic Activity Probabilities 14 Aug to 16 Aug
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 25% | 20% | 15% |
| Minor storm | 15% | 10% | 05% |
| Major-severe storm | 05% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 30% | 25% | 15% |
| Minor storm | 15% | 10% | 05% |
| Major-severe storm | 05% | 01% | 01% |
All times in UTC
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