Viewing archive of Thursday, 21 February 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 Feb 21 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 52 Issued at 2200Z on 21 Feb 2013IA. Analysis of Solar Active Regions and Activity from 20-2100Z to 21-2100Z Solar activity has been at low levels for the past 24 hours.
The largest solar event of the period was a C2 event observed at
21/0505Z from Region 1678 (N10W66). There are currently 5 numbered
sunspot regions on the disk.
IB. Solar Activity Forecast
Solar activity is expected to be low with
a chance for M-class flares and a slight chance for an X-class flare on
days one and two (22 Feb, 23 Feb) and expected to be very low with a
chance for a C-class flares and a slight chance for an M-class flare on
day three (24 Feb).
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 454 km/s at
21/0100Z. Total IMF reached 9 nT at 21/0432Z. The maximum southward
component of Bz reached -7 nT at 21/0026Z.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to unsettled levels on days one and two (22 Feb, 23 Feb)
and quiet levels on day three (24 Feb). Protons greater than 10 Mev have
a slight chance of crossing threshold on days one and two (22 Feb, 23
Feb).
III. Event Probabilities 22 Feb to 24 Feb
| Class M | 40% | 40% | 10% |
| Class X | 10% | 10% | 01% |
| Proton | 10% | 10% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 21 Feb 109 Predicted 22 Feb-24 Feb 105/105/100 90 Day Mean 21 Feb 115
V. Geomagnetic A Indices
Observed Afr/Ap 20 Feb 006/006 Estimated Afr/Ap 21 Feb 005/006 Predicted Afr/Ap 22 Feb-24 Feb 007/008-010/010-007/008
VI. Geomagnetic Activity Probabilities 22 Feb to 24 Feb
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 15% | 20% | 15% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 20% | 15% |
| Minor storm | 25% | 30% | 20% |
| Major-severe storm | 25% | 25% | 20% |
All times in UTC
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