Viewing archive of Saturday, 21 September 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 Sep 21 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 264 Issued at 2200Z on 21 Sep 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 C3 event observed at
21/0924Z from Region 1850 (N08E52). There are currently 5 numbered
sunspot regions on the disk.
IB. Solar Activity Forecast
Solar activity is likely to be low on days
one, two, and three (22 Sep, 23 Sep, 24 Sep).
IIA. Geophysical Activity Summary 20-2100Z to 21-2100Z
The geomagnetic
field has been at quiet to unsettled levels for the past 24 hours. Solar
wind speed, as measured by the ACE spacecraft, reached a peak speed of
470 km/s at 20/2137Z. Total IMF reached 5 nT at 21/1732Z. The maximum
southward component of Bz reached -4 nT at 21/0722Z. Electrons greater
than 2 MeV at geosynchronous orbit reached a peak level of 2810 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet levels on day one (22 Sep) and quiet to unsettled levels
on days two and three (23 Sep, 24 Sep).
III. Event Probabilities 22 Sep to 24 Sep
| Class M | 05% | 05% | 05% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 21 Sep 110 Predicted 22 Sep-24 Sep 115/118/115 90 Day Mean 21 Sep 111
V. Geomagnetic A Indices
Observed Afr/Ap 20 Sep 005/006 Estimated Afr/Ap 21 Sep 008/007 Predicted Afr/Ap 22 Sep-24 Sep 005/005-008/008-008/008
VI. Geomagnetic Activity Probabilities 22 Sep to 24 Sep
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 05% | 10% | 10% |
| Minor storm | 01% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 15% | 25% | 25% |
| Major-severe storm | 05% | 10% | 10% |
All times in UTC
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