Viewing archive of Saturday, 17 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 17 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 322 Issued at 2200Z on 17 Nov 2012IA. Analysis of Solar Active Regions and Activity from 16-2100Z to 17-2100Z Solar activity was at low levels. The largest flare was a C2
event observed at 17/1810Z from Region 1615 (N08W21), a simple Bxo group
with beta magnetic characteristics. Region 1613 (S24W19) remained the
most magnetically complex (beta-gamma) of the nine spotted regions on
the visible disk, while Region 1614 (N15W07) remained the largest at 160
millionths. The general downward trend in active region complexity and
size continued today
IB. Solar Activity Forecast
Solar activity is expected to be at low
levels with a slight chance for moderate activity through the period
(18-20 Nov).
IIA. Geophysical Activity Summary 16-2100Z to 17-2100Z
The geomagnetic
field was at quiet to unsettled levels. Solar wind measured at the ACE
spacecraft began fluctuating between positive and negative sectors
around 17/0655Z, enventually settling into the positive sector after
17/1800Z. About an hour after the fluctuations began, wind speed began
rising from 390 km/s and reached a peak speed of 453 km/s at 17/1444Z.
Total IMF reached 6.2 nT at 17/0746Z. The maximum southward component of
Bz reached -4.7 nT at 17/0345Z. These observations were consistent with
the arrival of a weak positive coronal hole high speed stream. The
greater than 2 MeV electron flux at geosynchronous orbit reached 3160
pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at mostly quiet levels with isolated unsettled periods possible
for the next three days (18-20 Nov).
III. Event Probabilities 18 Nov to 20 Nov
| Class M | 20% | 20% | 20% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 17 Nov 135 Predicted 18 Nov-20 Nov 135/135/135 90 Day Mean 17 Nov 120
V. Geomagnetic A Indices
Observed Afr/Ap 16 Nov 005/005 Estimated Afr/Ap 17 Nov 006/008 Predicted Afr/Ap 18 Nov-20 Nov 007/008-006/005-006/005
VI. Geomagnetic Activity Probabilities 18 Nov to 20 Nov
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 10% | 05% | 05% |
| Minor storm | 05% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 20% | 10% | 10% |
| Major-severe storm | 20% | 05% | 05% |
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