Viewing archive of Monday, 1 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 01 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 275 Issued at 2200Z on 01 Oct 2012IA. Analysis of Solar Active Regions and Activity from 30-2100Z to 01-2100Z Solar activity was low. Region 1575 (now around the
west limb) produced several C-class x-ray events during the period,
the greatest a C9 at 30/2339Z. No Earth-sided CMEs were observed
leaving the solar disk.
IB. Solar Activity Forecast
Solar activity is expected to be low
for day 1 (2 October). Activity is expected to be very low to low on
days 2 and 3 (3 and 4 October), as the complex or regions near the
western extent of the visible solar disk continue beyond the limb.
IIA. Geophysical Activity Summary 30-2100Z to 01-2100Z
The geomagnetic field began the period at active levels, as weak CME
effects from the previous period continued in progress. The first
period of 1 October saw an increase to severe storm levels, after a
second CME arrived at ACE around 30/2221Z with a subsequent Sudden
Impulse (SI) to Earths magnetic field (35nT measured at Boulder) at
30/2307Z. A single major storm period followed, before conditions
decreased to active and then again to quiet.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be quiet to unsettled on day 1 (2 October) as CME
effects wane. Days 2 and 3 (3 and 4 October) should see mostly quiet
conditions.
III. Event Probabilities 02 Oct to 04 Oct
| Class M | 05% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 01 Oct 128 Predicted 02 Oct-04 Oct 125/125/125 90 Day Mean 01 Oct 124
V. Geomagnetic A Indices
Observed Afr/Ap 30 Sep 009/013 Estimated Afr/Ap 01 Oct 017/031 Predicted Afr/Ap 02 Oct-04 Oct 008/010-004/005-004/005
VI. Geomagnetic Activity Probabilities 02 Oct to 04 Oct
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 15% | 05% | 05% |
| Minor storm | 01% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 25% | 15% | 15% |
| Major-severe storm | 15% | 05% | 05% |
All times in UTC
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