Viewing archive of Tuesday, 20 November 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 Nov 20 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 325 Issued at 2200Z on 20 Nov 2012IA. Analysis of Solar Active Regions and Activity from 19-2100Z to 20-2100Z Solar activity has been at moderate levels for the past 24
hours. The largest solar event of the period was a M1 event, with an
associated Earth-directed CME (estimated velocity of 664 km/s), observed
at 20/1241Z. There are currently 7 numbered sunspot regions on the disk.
Region 1618 (N08E14) has retained its beta-gamma magnetic complexity.
New Region 1620 (S08E59) was numbered.
IB. Solar Activity Forecast
Solar activity is expected to be at
moderate levels on days one, two, and three (21 Nov, 22 Nov, 23 Nov).
IIA. Geophysical Activity Summary 19-2100Z to 20-2100Z
The geomagnetic
field has been at quiet to active levels for the past 24 hours. Solar
wind speed, as measured by the ACE spacecraft, reached a peak speed of
461 km/s at 20/1958Z. Total IMF reached 7.8 nT at 19/2347Z. The maximum
southward component of Bz reached -7.2 nT at 20/1725Z. Electrons greater
than 2 MeV at geosynchronous orbit reached a peak level of 1277 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at mostly quiet levels for the next three days (21 Nov, 22 Nov, 23
Nov). Protons have a slight chance to cross alert threshold on days one,
two, and three (21 Nov, 22 Nov, 23 Nov) due to expected solar flare
activity from Region 1618. Further analysis is needed to determine the
geoeffectiveness of todays CME.
III. Event Probabilities 21 Nov to 23 Nov
| Class M | 70% | 70% | 70% |
| Class X | 15% | 15% | 15% |
| Proton | 15% | 15% | 15% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 20 Nov 141 Predicted 21 Nov-23 Nov 140/135/135 90 Day Mean 20 Nov 122
V. Geomagnetic A Indices
Observed Afr/Ap 19 Nov 003/005 Estimated Afr/Ap 20 Nov 009/012 Predicted Afr/Ap 21 Nov-23 Nov 006/005-006/005-007/009
VI. Geomagnetic Activity Probabilities 21 Nov to 23 Nov
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 05% | 05% | 10% |
| Minor storm | 01% | 01% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 10% | 10% | 20% |
| Major-severe storm | 05% | 05% | 20% |
All times in UTC
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