Viewing archive of Thursday, 25 September 2014
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 2014 Sep 25 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 268 Issued at 2200Z on 25 Sep 2014IA. Analysis of Solar Active Regions and Activity from 24-2100Z to 25-2100Z
Solar activity has been at low levels for the past 24 hours.
The largest solar event of the period was a C4 event observed at
24/2342Z. There are currently 7 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, two, and three (26 Sep, 27 Sep, 28 Sep).
IIA. Geophysical Activity Summary 24-2100Z to 25-2100Z
The geomagnetic
field has been at quiet to active levels for the past 24 hours. Solar
wind speed, as measured by the ACE spacecraft, reached a peak speed of
513 km/s at 25/0342Z. Total IMF reached 8 nT at 25/0233Z. The maximum
southward component of Bz reached -6 nT at 25/0245Z. Electrons greater
than 2 MeV at geosynchronous orbit reached a peak level of 758 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to active levels on days one, two, and three (26 Sep, 27
Sep, 28 Sep).
III. Event Probabilities 26 Sep to 28 Sep
| Class M | 45% | 45% | 45% |
| Class X | 10% | 10% | 10% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 25 Sep 158 Predicted 26 Sep-28 Sep 165/165/165 90 Day Mean 25 Sep 134
V. Geomagnetic A Indices
Observed Afr/Ap 24 Sep 019/025 Estimated Afr/Ap 25 Sep 013/015 Predicted Afr/Ap 26 Sep-28 Sep 010/012-011/015-011/015
VI. Geomagnetic Activity Probabilities 26 Sep to 28 Sep
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 35% | 35% | 35% |
| Minor storm | 15% | 15% | 15% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 10% | 10% | 10% |
| Minor storm | 30% | 30% | 30% |
| Major-severe storm | 50% | 50% | 50% |
All times in UTC
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