Report of Solar-Geophysical Activity
Issued: 2011 Feb 27 2200 UTC
Prepared jointly by the U.S. Dept. of Commerce, NOAA,
Space Weather Prediction Center and the U.S. Air Force.
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 058 Issued at 2200Z on 27 Feb 2011
IA. Analysis of Solar Active Regions and Activity from 26/2100Z
to 27/2100Z: Solar activity was low during the past 24 hours.
Region 1164 (N27E46) produced several C-class events, the largest of
which was a C4/Sf observed at 27/0355Z. A possible filament eruption
around N15E70 was visible on SDO/AIA imagery at approximately
27/0930Z. An associated CME was observed on LASCO C2 at 27/1048Z but
is not expected to be geoeffective.
IB. Solar Activity Forecast: Solar activity is expected to be low
for the next three days (28 February - 02 March). A chance for
M-class activity exists from Region 1164.
IIA. Geophysical Activity Summary 26/2100Z to 27/2100Z:
The geomagnetic field was quiet during the past 24 hours.
IIB. Geophysical Activity Forecast: The geomagnetic field is
expected to be quiet on day one (28 February). Quiet to unsettled
conditions are expected for days two and three (01-02 March) due to
the effects of a recurrent coronal hole high speed stream.
III. Event Probabilities 28 Feb-02 Mar
Class M 35/35/35
Class X 01/01/01
Proton 01/01/01
PCAF Green
IV. Penticton 10.7 cm Flux
Observed 27 Feb 090
Predicted 28 Feb-02 Mar 090/090/090
90 Day Mean 27 Feb 087
V. Geomagnetic A Indices
Observed Afr/Ap 26 Feb 002/004
Estimated Afr/Ap 27 Feb 002/005
Predicted Afr/Ap 28 Feb-02 Mar 005/005-008/010-008/010
VI. Geomagnetic Activity Probabilities 28 Feb-02 Mar
A. Middle Latitudes
Active 05/20/20
Minor storm 01/10/10
Major-severe storm 01/01/01
B. High Latitudes
Active 15/25/25
Minor storm 01/10/10
Major-severe storm 01/01/01
For current space weather conditions please refer to:
NOAA Space Weather Scale descriptions can be found at
www.sec.noaa.gov/NOAAscales
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