Viewing archive of Wednesday, 28 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 28 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 333 Issued at 2200Z on 28 Nov 2012IA. Analysis of Solar Active Regions and Activity from 27-2100Z to 28-2100Z Solar activity has been at moderate levels for the past 24
hours. The largest solar event of the period was a M1 event observed at
27/2126Z from Region 1620 (S12W57). The region continued to grow in
areal coverage and maintained a beta-gamma-delta configuration. Region
1623 (N09E60) also grew significantly in areal coverage but the magnetic
complexity is difficult to determine with its proximity to the limb.
There are currently 4 numbered sunspot regions on the disk. No
Earth-directed CMEs were observed during the period.
IB. Solar Activity Forecast
Solar activity is expected to be at low to
moderate levels on days one, two, and three (29 Nov, 30 Nov, 01 Dec).
IIA. Geophysical Activity Summary 27-2100Z to 28-2100Z
The geomagnetic
field has been at quiet levels for the past 24 hours. Solar wind speed,
as measured by the ACE spacecraft, reached a peak speed of 448 km/s at
28/0119Z and has since decreased to nominal levels.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to remain quiet through the majority of 29 Nov. Quiet to unsettled
conditions with a chance for active periods are expected to begin late
on day one (around 29/1800Z) with the anticipated arrival of the 26 and
27 Nov CMEs. Activity is expected to return to mostly quiet levels by
the latter half of day two (30 Nov) as the effects from the CMEs
subside. Isolated unsettled periods are possible through day three (01
Dec) due to coronal hole high speed stream effects.
III. Event Probabilities 29 Nov to 01 Dec
| Class M | 35% | 35% | 35% |
| Class X | 05% | 05% | 05% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 28 Nov 114 Predicted 29 Nov-01 Dec 110/105/105 90 Day Mean 28 Nov 123
V. Geomagnetic A Indices
Observed Afr/Ap 27 Nov 003/004 Estimated Afr/Ap 28 Nov 002/002 Predicted Afr/Ap 29 Nov-01 Dec 009/011-012/015-007/008
VI. Geomagnetic Activity Probabilities 29 Nov to 01 Dec
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 20% | 40% | 10% |
| Minor storm | 10% | 20% | 05% |
| Major-severe storm | 01% | 05% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 10% | 15% |
| Minor storm | 25% | 25% | 15% |
| Major-severe storm | 30% | 55% | 15% |
All times in UTC
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