Viewing archive of Sunday, 7 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 07 2200 UTC
Prepared by the NOAA © SWPC and processed by SpaceWeatherLive.comJoint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 281 Issued at 2200Z on 07 Oct 2012
IA. Analysis of Solar Active Regions and Activity from 06-2100Z to 07-2100Z
Solar activity was at low levels. At 07/2046Z, a C1
x-ray event was observed from an area of enhanced emission beyond
the NE limb. A few B-class flares were observed during the past 24
hours from Region 1585 (S21W01). New Region 1586 (S12E66) rotated
onto the disk as an H-type spot group. A 30 degree long filament,
centered near S65W15, erupted during the period. SDO imagery first
observed movement along the filament channel at approximately
06/2000Z with ejecta visible off the SW limb at about 07/0700Z.
LASCO C2 imagery observed a partial-halo CME lifting off the SW limb
first visible at 07/0812Z. Subsequent WSA-Enlil model output
indicated a possible weak, Earth-directed component of this CME. No
other Earth-directed CMEs were observed during the period.
IB. Solar Activity Forecast
Solar activity is expected to be at
very low levels with a chance for C-class activity all three days of
the forecast period (08 - 10 October).
IIA. Geophysical Activity Summary 06-2100Z to 07-2100Z
The geomagnetic field was at quiet levels. ACE satellite
measurements observed wind speeds varied between about 290 to 350
km/s while the Bz component of the interplanetary magnetic field did
not vary much beyond +/- 6 nT. Low energy particles, measured at
ACE, indicated a steady rise through the period likely associated
with the approaching 05 October CME.
IIB. Geophysical Activity Forecast
Geomagnetic field activity is
expected to be at predominately quiet to unsettled levels through
most of day one (08 October). Late on 08 October, active levels
with a chance for minor storm periods are expected due to the
arrival of the Earth-directed CME observed on 05 October. On day
two (09 October), continued minor storm conditions are expected
early in the day, decreasing to mostly quiet to unsettled levels
with a chance for isolated active periods as effects from the CME
wane. Quiet to unsettled conditions with a chance for isolated
active periods are expected on day three (10 October) due to effects
from a recurrent coronal hole high speed stream coupled with a
possible glancing blow from the 07 October CME.
III. Event Probabilities 08 Oct to 10 Oct
Class M | 05% | 05% | 01% |
Class X | 01% | 01% | 01% |
Proton | 01% | 01% | 01% |
PCAF | green
|
IV. Penticton 10.7 cm Flux
Observed 07 Oct 098
Predicted 08 Oct-10 Oct 095/095/090
90 Day Mean 07 Oct 120
V. Geomagnetic A Indices
Observed Afr/Ap 06 Oct 005/007
Estimated Afr/Ap 07 Oct 005/005
Predicted Afr/Ap 08 Oct-10 Oct 015/018-017/020-011/012
VI. Geomagnetic Activity Probabilities 08 Oct to 10 Oct
A. Middle Latitudes |
Active | 30% | 35% | 20% |
Minor storm | 15% | 20% | 10% |
Major-severe storm | 05% | 05% | 01% |
B. High Latitudes |
Active | 15% | 20% | 15% |
Minor storm | 20% | 25% | 20% |
Major-severe storm | 20% | 35% | 25% |
All times in UTC
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