Viewing archive of Monday, 21 January 2013
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 2013 Jan 21 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 21 Issued at 2200Z on 21 Jan 2013IA. Analysis of Solar Active Regions and Activity from 20-2100Z to 21-2100Z Solar activity has been at very low levels for the past 24
hours. There are currently 3 numbered sunspot regions on the disk.
Region 1658 (S12W46) produced the largest flare of the period, a B4
flare, at 21/0930Z. Region 1654 (N09W88) produced two B3 flares while
Region 1660 (N12W15) was fairly quiet, yet was the most magnetically
complex region on the disk. It has continued to show growth in the
trailer spots and extended its length from five degrees to just over
seven. This region currently appears to be a Dai/Beta-Gamma region and
will be the area of interest for the next few days.
IB. Solar Activity Forecast
Solar activity is expected to be at low
levels on days one, two, and three (22 Jan, 23 Jan, 24 Jan).
IIA. Geophysical Activity Summary 20-2100Z to 21-2100Z
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 409 km/s at
21/0029Z. Total IMF reached 16.2 nT at 21/1513Z. The maximum southward
component of Bz reached -5.2 nT at 21/1513Z. Electrons greater than 2
MeV at geosynchronous orbit reached a peak level of 268 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet levels for the next three days (22 Jan, 23 Jan, 24 Jan).
III. Event Probabilities 22 Jan to 24 Jan
| Class M | 10% | 10% | 10% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 21 Jan 108 Predicted 22 Jan-24 Jan 105/100/095 90 Day Mean 21 Jan 121
V. Geomagnetic A Indices
Observed Afr/Ap 20 Jan 008/008 Estimated Afr/Ap 21 Jan 004/004 Predicted Afr/Ap 22 Jan-24 Jan 006/005-006/005-006/005
VI. Geomagnetic Activity Probabilities 22 Jan to 24 Jan
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 10% | 10% | 10% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 15% | 15% | 15% |
| Major-severe storm | 15% | 15% | 15% |
All times in UTC
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