Viewing archive of Thursday, 31 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 31 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 31 Issued at 2200Z on 31 Jan 2013IA. Analysis of Solar Active Regions and Activity from 30-2100Z to 31-2100Z Solar activity has been at low levels for the past 24 hours.
The largest solar event of the period was a C1 event observed at
31/0434Z from Region 1663 (S09W24). There are currently 4 numbered
sunspot regions on the disk.
IB. Solar Activity Forecast
Solar activity is expected to be very low
with a chance for C-class flares on days one, two, and three (01 Feb, 02
Feb, 03 Feb).
IIA. Geophysical Activity Summary 30-2100Z to 31-2100Z
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 344 km/s at
31/2011Z. Total IMF reached 6.5 nT at 31/2045Z. The maximum southward
component of Bz reached -4.4 nT at 31/2023Z. Electrons greater than 2
MeV at geosynchronous orbit reached a peak level of 367 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to active levels on day one (01 Feb) increasing to
unsettled to active levels on days two and three (02 Feb, 03 Feb) as a
coronal hole high speed stream becomes geoeffective and is, followed by
a glancing blow from an earth-directed CME.
III. Event Probabilities 01 Feb to 03 Feb
| Class M | 01% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 31 Jan 103 Predicted 01 Feb-03 Feb 100/105/105 90 Day Mean 31 Jan 119
V. Geomagnetic A Indices
Observed Afr/Ap 30 Jan 002/001 Estimated Afr/Ap 31 Jan 002/002 Predicted Afr/Ap 01 Feb-03 Feb 005/005-007/012-012/018
VI. Geomagnetic Activity Probabilities 01 Feb to 03 Feb
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 10% | 10% | 25% |
| Minor storm | 01% | 01% | 10% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 15% | 20% | 25% |
| Major-severe storm | 10% | 10% | 35% |
All times in UTC
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