Viewing archive of Monday, 18 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 18 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 49 Issued at 2200Z on 18 Feb 2013IA. Analysis of Solar Active Regions and Activity from 17-2100Z to 18-2100Z 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
18/0241Z from Region 1675 (N13E04). There are currently 6 numbered
sunspot regions on the disk.
IB. Solar Activity Forecast
Solar activity is expected to be at low
levels on days one, two, and three (19 Feb, 20 Feb, 21 Feb) with a
chance for an M-class flare.
IIA. Geophysical Activity Summary 17-2100Z to 18-2100Z
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 373 km/s at
17/2215Z. Total IMF reached 7.7 nT at 18/1639Z. The maximum southward
component of Bz reached -6.8 nT at 18/2014Z.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to unsettled levels for the next three days (19 Feb, 20
Feb, 21 Feb) with a chance for active levels and a slight chance for
minor storm levels on days 2 - 3 (20 - 21 Feb).
III. Event Probabilities 19 Feb to 21 Feb
| Class M | 25% | 25% | 25% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 18 Feb 105 Predicted 19 Feb-21 Feb 105/100/100 90 Day Mean 18 Feb 116
V. Geomagnetic A Indices
Observed Afr/Ap 17 Feb 007/010 Estimated Afr/Ap 18 Feb 002/003 Predicted Afr/Ap 19 Feb-21 Feb 007/008-011/012-012/010
VI. Geomagnetic Activity Probabilities 19 Feb to 21 Feb
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 20% | 30% | 30% |
| Minor storm | 05% | 10% | 10% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 25% | 20% | 30% |
| Major-severe storm | 30% | 15% | 40% |
All times in UTC
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