Viewing archive of Saturday, 20 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 20 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 294 Issued at 2200Z on 20 Oct 2012IA. Analysis of Solar Active Regions and Activity from 19-2100Z to 20-2100Z Solar activity was high. An impulsive M9 flare
occurred at 20/1814Z from newly numbered Region 1598 (S15E82). This
region appeared to be responsible for several C-class flares as it
approached the visible disk and will continue to be the area of
interest for the next few days. An associated Type II radio sweep
was recorded with an estimated speed of 516 km/s. Region 1593
(N15E09) showed some shearing and spot loss over the past 24 hours,
while Region 1597 (S22W58) had some intermediate spot growth and
separation between leader and follower. The remaining regions
showed little to or no changes. No Earth-directed CMEs were
observed for the past 24 hours.
IB. Solar Activity Forecast
Solar activity is expected to be low
for the next three days (21-23 October) with a chance for isolated
M-class flares.
IIA. Geophysical Activity Summary 19-2100Z to 20-2100Z
The geomagnetic field was quiet over the past 24 hours. Solar wind
speed, as measured at the ACE spacecraft, steadily decreased from
approximately 440 km/s to near 380 km/s. The Bz component of the
interplanetary magnetic field continued to show minor deflections of
+/- 2 nT while total fields hovered near 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 on day 1 (21 October). An increase to quiet to
unsettled levels is expected for days 2 and 3 (22-23 October) due to
the effects of a weak coronal hole high speed stream.
III. Event Probabilities 21 Oct to 23 Oct
| Class M | 40% | 40% | 40% |
| Class X | 10% | 10% | 10% |
| Proton | 05% | 05% | 05% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 20 Oct 151 Predicted 21 Oct-23 Oct 150/150/145 90 Day Mean 20 Oct 120
V. Geomagnetic A Indices
Observed Afr/Ap 19 Oct 003/002 Estimated Afr/Ap 20 Oct 003/004 Predicted Afr/Ap 21 Oct-23 Oct 006/005-007/008-007/008
VI. Geomagnetic Activity Probabilities 21 Oct to 23 Oct
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 10% | 10% | 10% |
| Minor storm | 01% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 20% | 20% |
| Minor storm | 20% | 25% | 25% |
| Major-severe storm | 10% | 15% | 15% |
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