Viewing archive of Friday, 31 May 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 May 31 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 151 Issued at 2200Z on 31 May 2013IA. Analysis of Solar Active Regions and Activity from 30-2100Z to 31-2100Z Solar activity has been at moderate levels for the past 24
hours. The largest solar event of the period was an M1 event observed at
31/2000Z from Region 1760 (N12E38). There are currently 5 numbered
sunspot regions on the disk.
IB. Solar Activity Forecast
Solar activity is expected to be very low
with a chance for a C-class flares and a slight chance for an M-class
flare on days one, two, and three (01 Jun, 02 Jun, 03 Jun).
IIA. Geophysical Activity Summary 30-2100Z to 31-2100Z
The geomagnetic
field has been at quiet to unsettled levels for the past 24 hours. Solar
wind speed, as measured by the ACE spacecraft, reached a peak speed of
423 km/s at 31/1943Z. Total IMF reached 9 nT at 31/1852Z. The maximum
southward component of Bz reached -8 nT at 31/1710Z. Electrons greater
than 2 MeV at geosynchronous orbit reached a peak level of 32295 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to minor storm levels on day one (01 Jun), quiet to
active levels on day two (02 Jun) and quiet to unsettled levels on day
three (03 Jun).
III. Event Probabilities 01 Jun to 03 Jun
| Class M | 15% | 15% | 15% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 31 May 102 Predicted 01 Jun-03 Jun 100/100/110 90 Day Mean 31 May 123
V. Geomagnetic A Indices
Observed Afr/Ap 30 May 002/003 Estimated Afr/Ap 31 May 005/006 Predicted Afr/Ap 01 Jun-03 Jun 011/018-012/015-010/010
VI. Geomagnetic Activity Probabilities 01 Jun to 03 Jun
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 25% | 30% | 20% |
| Minor storm | 10% | 10% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 30% | 30% | 25% |
| Major-severe storm | 40% | 40% | 30% |
All times in UTC
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