Viewing archive of Tuesday, 21 October 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 Oct 21 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 294 Issued at 2200Z on 21 Oct 2014IA. Analysis of Solar Active Regions and Activity from 20-2100Z to 21-2100Z 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
20/2255Z from Region 2192 (S13E30). There are currently 4 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
(22 Oct, 23 Oct, 24 Oct).
IIA. Geophysical Activity Summary 20-2100Z to 21-2100Z
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
697 km/s at 21/1308Z. Total IMF reached 9 nT at 21/0126Z. The maximum
southward component of Bz reached -8 nT at 20/2116Z. Electrons greater
than 2 MeV at geosynchronous orbit reached a peak level of 2238 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to active levels on days one and two (22 Oct, 23 Oct) and
unsettled levels on day three (24 Oct). Protons have a slight chance of
crossing threshold on days one, two, and three (22 Oct, 23 Oct, 24 Oct).
III. Event Probabilities 22 Oct to 24 Oct
| Class M | 65% | 65% | 65% |
| Class X | 20% | 20% | 20% |
| Proton | 10% | 10% | 10% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 21 Oct 199 Predicted 22 Oct-24 Oct 205/210/210 90 Day Mean 21 Oct 135
V. Geomagnetic A Indices
Observed Afr/Ap 20 Oct 017/026 Estimated Afr/Ap 21 Oct 012/015 Predicted Afr/Ap 22 Oct-24 Oct 013/015-014/015-013/015
VI. Geomagnetic Activity Probabilities 22 Oct to 24 Oct
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 25% | 25% | 30% |
| Minor storm | 10% | 10% | 10% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 30% | 30% | 35% |
| Major-severe storm | 40% | 40% | 40% |
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