Viewing archive of Thursday, 18 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 18 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 292 Issued at 2200Z on 18 Oct 2012IA. Analysis of Solar Active Regions and Activity from 17-2100Z to 18-2100Z Solar activity was very low. The x-ray background
remained steady at B4 for the duration of the period. Newly
numbered Region 1596 (N11E73) is a ~300 millionths E-type group and
is the most prominent region on the disk. New Region 1597 (S21W30)
emerged as a small bi-polar region. The other regions on the disk
were stable or decaying.
IB. Solar Activity Forecast
Solar activity is expected to be low
with a slight chance for an isolated M-class event during the next
three days (19 - 21 Oct).
IIA. Geophysical Activity Summary 17-2100Z to 18-2100Z
The geomagnetic field was quiet during the past 24 hours. The solar
wind speed measured at the ACE spacecraft gradually increased from
around 500 km/s to the end-of-day value around 600 km/s. These
signatures are consistent with a high speed stream from a negative
polarity coronal hole. 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 with a chance for an isolated unsettled period
for the next two days (19 - 20 Oct). The geomagnetic field is
expected to be mostly unsettled on 21 Oct due to a high speed stream
associated with a negative polarity coronal hole.
III. Event Probabilities 19 Oct to 21 Oct
| Class M | 10% | 10% | 10% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 18 Oct 138 Predicted 19 Oct-21 Oct 140/140/140 90 Day Mean 18 Oct 119
V. Geomagnetic A Indices
Observed Afr/Ap 17 Oct 006/006 Estimated Afr/Ap 18 Oct 004/005 Predicted Afr/Ap 19 Oct-21 Oct 006/006-006/005-007/008
VI. Geomagnetic Activity Probabilities 19 Oct to 21 Oct
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 05% | 05% | 05% |
| Minor storm | 01% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 10% | 10% | 15% |
| Major-severe storm | 05% | 05% | 05% |
All times in UTC
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