Viewing archive of Wednesday, 11 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 11 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 254 Issued at 2200Z on 11 Sep 2013IA. Analysis of Solar Active Regions and Activity from 10-2100Z to 11-2100Z Solar activity has been at very low levels for the past 24
hours. There are currently 4 numbered sunspot regions on the disk.
IB. Solar Activity Forecast
Solar activity is expected to be very low
with a slight chance for a C-class flare on days one, two, and three (12
Sep, 13 Sep, 14 Sep).
IIA. Geophysical Activity Summary 10-2100Z to 11-2100Z
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 417 km/s at
11/1705Z. Total IMF reached 7 nT at 10/2355Z. The maximum southward
component of Bz reached -5 nT at 11/0021Z. Electrons greater than 2 MeV
at geosynchronous orbit reached a peak level of 162 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at unsettled to active levels on day one (12 Sep) and quiet to
active levels on day two (13 Sep) due to coronal hole high speed stream
(CH HSS) effects. Quiet to unsettled levels are expected on day three
(14 Sep) as CH HSS effects subside.
III. Event Probabilities 12 Sep to 14 Sep
| Class M | 01% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 11 Sep 093 Predicted 12 Sep-14 Sep 095/095/100 90 Day Mean 11 Sep 114
V. Geomagnetic A Indices
Observed Afr/Ap 10 Sep 006/006 Estimated Afr/Ap 11 Sep 008/010 Predicted Afr/Ap 12 Sep-14 Sep 016/020-013/015-008/008
VI. Geomagnetic Activity Probabilities 12 Sep to 14 Sep
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 40% | 30% | 10% |
| Minor storm | 15% | 15% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 10% | 15% | 15% |
| Minor storm | 30% | 30% | 25% |
| Major-severe storm | 50% | 45% | 20% |
All times in UTC
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