Viewing archive of Tuesday, 31 July 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 Jul 31 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 213 Issued at 2200Z on 31 Jul 2012IA. Analysis of Solar Active Regions and Activity from 30-2100Z to 31-2100Z Solar activity was low. The largest of the C-class
flares were an impulsive C6 at 31/0000Z from new Region 1538
(S23E68) and a long-duration C5 at 31/1130Z from Region 1535
(N18E51). Both flares had associated Type II (estimated speeds of
730 and 880 km/s, respectively) and Type IV radio sweeps along with
coronal mass ejections seen off the East limb in SOHO/LASCO C2
imagery. Another CME was observed in SOHO/LASCO C2 imagery off the
southwest limb associated with a filament eruption seen in SDO/AIA
171 imagery at 31/0846Z. None of the CMEs are expected to be
geoeffective. New Region 1537 (N12E76) rotated onto the northeast
limb and was numbered today.
IB. Solar Activity Forecast
Solar activity is expected to be low
with a chance for M-class flares.
IIA. Geophysical Activity Summary 30-2100Z to 31-2100Z
The geomagnetic field was quiet.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be mostly quiet on day 1 (01 August). On day 2 (02
August), geomagnetic activity is expected to be at quiet to
unsettled levels with possible isolated active periods due to
effects from the 28 July CME. Conditions are expected to be quiet
to unsettled on day 3 (03 August).
III. Event Probabilities 01 Aug to 03 Aug
| Class M | 35% | 35% | 35% |
| Class X | 05% | 05% | 05% |
| Proton | 05% | 05% | 05% |
| PCAF | Green | ||
IV. Penticton 10.7 cm Flux
Observed 31 Jul 140 Predicted 01 Aug-03 Aug 140/145/150 90 Day Mean 31 Jul 126
V. Geomagnetic A Indices
Observed Afr/Ap 30 Jul 011/015 Estimated Afr/Ap 31 Jul 006/006 Predicted Afr/Ap 01 Aug-03 Aug 006/005-008/010-007/008
VI. Geomagnetic Activity Probabilities 01 Aug to 03 Aug
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 05% | 20% | 15% |
| Minor storm | 01% | 10% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 15% | 25% | 20% |
| Major-severe storm | 05% | 30% | 20% |
All times in UTC
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