Viewing archive of Sunday, 21 October 2012
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 2012 Oct 21 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 295 Issued at 2200Z on 21 Oct 2012IA. Analysis of Solar Active Regions and Activity from 20-2100Z to 21-2100Z Solar activity has been moderate for the past 24 hours.
An M1/Sf flare from Region 1598 (S12E70) occurred at 21/2003Z.
This region has shown some development as it has rotated further
onto the visible disk and remains the main area of interest. Region
1596 (N07E33) continues to be the most magnetically complex region
on the visible disk as an Eho/Beta-Gamma spot group, but has shown
slight decay in the trailer spots over the past 24 hours. All other
spots remain relatively stable. No Earth-directed CMEs were
observed over the past 24 hours.
IB. Solar Activity Forecast
Solar activity is expected to be low
for the next three days (22-24 October) with isolated M-class flares
likely.
IIA. Geophysical Activity Summary 20-2100Z to 21-2100Z
The geomagnetic field was quiet over the past 24 hours. Solar wind
speed, as measured by the ACE spacecraft, remained steady at
approximately 360 km/s while the Bz component of the interplanetary
magnetic field showed minor deviations of +/-4 nT. The greater than
2 MeV electron flux at geosynchronous orbit was at high levels
throughout the period.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be quiet to unsettled on days 1 and 2 (22-23 October)
due to the effects of a coronal hole high speed stream (CH HSS).
Conditions are expected to return to quiet levels by day 3 (24
October) as the effects from the CH HSS begin to wane.
III. Event Probabilities 22 Oct to 24 Oct
| Class M | 60% | 60% | 60% |
| Class X | 05% | 05% | 05% |
| Proton | 05% | 05% | 05% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 21 Oct 144 Predicted 22 Oct-24 Oct 145/140/140 90 Day Mean 21 Oct 120
V. Geomagnetic A Indices
Observed Afr/Ap 20 Oct 003/001 Estimated Afr/Ap 21 Oct 004/004 Predicted Afr/Ap 22 Oct-24 Oct 007/008-007/008-006/005
VI. Geomagnetic Activity Probabilities 22 Oct to 24 Oct
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 10% | 10% | 05% |
| Minor storm | 01% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 20% | 20% | 15% |
| Minor storm | 30% | 25% | 15% |
| Major-severe storm | 20% | 20% | 05% |
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