Viewing archive of Saturday, 13 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 13 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 256 Issued at 2200Z on 13 Sep 2014IA. Analysis of Solar Active Regions and Activity from 12-2100Z to 13-2100Z 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
13/1254Z from Region 2157 (S14W51). There are currently 8 numbered
sunspot regions on the disk.
IB. Solar Activity Forecast
Solar activity is likely to be moderate
with a chance for X-class flares on days one, two, and three (14 Sep, 15
Sep, 16 Sep).
IIA. Geophysical Activity Summary 12-2100Z to 13-2100Z
The geomagnetic
field has been at quiet to severe storm levels for the past 24 hours.
Solar wind speed, as measured by the ACE spacecraft, reached a peak
speed of 791 km/s at 12/2233Z. Total IMF reached 30 nT at 12/2251Z. The
maximum southward component of Bz reached -17 nT at 12/2202Z. Protons
greater than 10 MeV at geosynchronous orbit reached a peak level of 20
pfu at 12/2100Z.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to minor storm levels on day one (14 Sep), quiet to
unsettled levels on day two (15 Sep) and quiet to active levels on day
three (16 Sep). Protons have a chance of crossing threshold on days one,
two, and three (14 Sep, 15 Sep, 16 Sep).
III. Event Probabilities 14 Sep to 16 Sep
| Class M | 65% | 65% | 65% |
| Class X | 25% | 25% | 25% |
| Proton | 25% | 25% | 25% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 13 Sep 145 Predicted 14 Sep-16 Sep 145/140/135 90 Day Mean 13 Sep 130
V. Geomagnetic A Indices
Observed Afr/Ap 12 Sep 035/038 Estimated Afr/Ap 13 Sep 014/017 Predicted Afr/Ap 14 Sep-16 Sep 012/022-008/008-008/010
VI. Geomagnetic Activity Probabilities 14 Sep to 16 Sep
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 35% | 15% | 30% |
| Minor storm | 20% | 05% | 10% |
| Major-severe storm | 05% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 10% | 15% | 15% |
| Minor storm | 25% | 25% | 30% |
| Major-severe storm | 50% | 25% | 40% |
All times in UTC
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