Viewing archive of Saturday, 11 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 11 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 131 Issued at 2200Z on 11 May 2013IA. Analysis of Solar Active Regions and Activity from 10-2100Z to 11-2100Z Solar activity has been at low levels for the past 24 hours.
The largest solar event of the period was a C8 event observed at
11/1948Z from Region 1746 (S27E63). There are currently 10 numbered
sunspot regions on the disk.
IB. Solar Activity Forecast
Solar activity is expected to be low with
a chance for M-class flares on days one, two, and three (12 May, 13 May,
14 May).
IIA. Geophysical Activity Summary 10-2100Z to 11-2100Z
The geomagnetic
field has been at quiet levels for the past 24 hours. Solar wind speed,
as measured by the ACE spacecraft, reached a peak speed of 439 km/s at
10/2122Z. Electrons greater than 2 MeV at geosynchronous orbit reached a
peak level of 551 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to unsettled levels on days one and two (12 May, 13 May)
and quiet levels on day three (14 May).
III. Event Probabilities 12 May to 14 May
| Class M | 45% | 45% | 45% |
| Class X | 05% | 05% | 05% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 11 May 137 Predicted 12 May-14 May 130/125/125 90 Day Mean 11 May 117
V. Geomagnetic A Indices
Observed Afr/Ap 10 May 004/004 Estimated Afr/Ap 11 May 004/005 Predicted Afr/Ap 12 May-14 May 005/008-007/008-003/005
VI. Geomagnetic Activity Probabilities 12 May to 14 May
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 10% |
| Minor storm | 05% | 05% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 25% | 25% | 15% |
| Major-severe storm | 25% | 25% | 10% |
All times in UTC
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