Viewing archive of Sunday, 13 March 2011
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 2011 Mar 13 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 072 Issued at 2200Z on 13 Mar 2011IA. Analysis of Solar Active Regions and Activity from 12-2100Z to 13-2100Z Solar activity was low. Regions 1166 (N10W65) and 1169
(N20W34) have both produced C-class events. The daily consensus has
Region 1166 as decreased in both white light areal coverage and
sunspot count with a Ekc type spot group and a beta-gamma magnetic
classification. Region 1169 has maintained its area and spot count
and is a simple beta magnetic classification with a Cro type spot
group.
IB. Solar Activity Forecast
Solar activity is expected to be low
with a chance for an M-class event.
IIA. Geophysical Activity Summary 12-2100Z to 13-2100Z
The geomagnetic field was quiet to unsettled. The ACE spacecraft
observed solar wind speeds during the past 24 hours averaging around
550 km/s with the interplanetary magnetic field Bz fluctuating
between -4/+5 nT. Observations suggest that the earth is still
under the influence of the coronal hole high speed stream. The
greater than 2 MeV electron flux at geosynchronous orbit reached
high levels during the period.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be quiet to unsettled with a chance for isolated active
levels for day one (14 March). Days two and three (15-16 March) are
expected to be predominately quiet as the effects from the coronal
hole high speed stream subside.
III. Event Probabilities 14 Mar to 16 Mar
| Class M | 40% | 20% | 20% |
| Class X | 05% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 13 Mar 113 Predicted 14 Mar-16 Mar 110/110/110 90 Day Mean 13 Mar 093
V. Geomagnetic A Indices
Observed Afr/Ap 12 Mar 010/013 Estimated Afr/Ap 13 Mar 005/005 Predicted Afr/Ap 14 Mar-16 Mar 008/008-005/005-005/005
VI. Geomagnetic Activity Probabilities 14 Mar to 16 Mar
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 25% | 05% | 05% |
| Minor storm | 05% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 30% | 05% | 05% |
| Minor storm | 10% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
All times in UTC
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