Viewing archive of Saturday, 27 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 27 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 270 Issued at 2200Z on 27 Sep 2014IA. Analysis of Solar Active Regions and Activity from 26-2100Z to 27-2100Z Solar activity has been at moderate levels for the past 24
hours. The largest solar event of the period was a M1 event observed at
27/0837Z. There are currently 6 numbered sunspot regions on the disk.
IB. Solar Activity Forecast
Solar activity is likely to be moderate
with a slight chance for an X-class flare on days one, two, and three
(28 Sep, 29 Sep, 30 Sep).
IIA. Geophysical Activity Summary 26-2100Z to 27-2100Z
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
481 km/s at 27/0306Z. Total IMF reached 7 nT at 27/2035Z. The maximum
southward component of Bz reached -6 nT at 27/0022Z. Electrons greater
than 2 MeV at geosynchronous orbit reached a peak level of 1167 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to active levels on day one (28 Sep) and quiet to
unsettled levels on days two and three (29 Sep, 30 Sep). Protons have a
slight chance of crossing threshold on days one, two, and three (28 Sep,
29 Sep, 30 Sep).
III. Event Probabilities 28 Sep to 30 Sep
| Class M | 65% | 65% | 65% |
| Class X | 10% | 10% | 10% |
| Proton | 10% | 10% | 10% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 27 Sep 181 Predicted 28 Sep-30 Sep 180/185/185 90 Day Mean 27 Sep 135
V. Geomagnetic A Indices
Observed Afr/Ap 26 Sep 012/013 Estimated Afr/Ap 27 Sep 014/016 Predicted Afr/Ap 28 Sep-30 Sep 011/015-011/012-007/010
VI. Geomagnetic Activity Probabilities 28 Sep to 30 Sep
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 35% | 35% | 25% |
| Minor storm | 15% | 15% | 10% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 10% | 10% | 15% |
| Minor storm | 30% | 30% | 25% |
| Major-severe storm | 50% | 50% | 35% |
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