Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 091 Issued at 2200Z on 31 Mar 2012
IA. Analysis of Solar Active Regions and Activity from 30/2100Z
to 31/2100Z: Solar activity was low. A single C1/Sf flare was
observed from Region 1451 (N17E53) at 30/2112Z. New Region 1451 was
a simple Cro type group with a beta magnetic configuration. New
Region 1450 (N15E38) was also numbered and also a Cro type group
with beta magnetic characteristics. The remaining regions were
quiet and magnetically simple.
IB. Solar Activity Forecast: Solar activity is expected to be at
very low to low levels. An isolated C-class flare is likely with a
slight chance for an M-class event.
IIA. Geophysical Activity Summary 30/2100Z to 31/2100Z:
The geomagnetic field was at quiet levels. Solar wind speed measured at the ACE spacecraft ranged from around 450 km/s at the beginning of the period to 350 km/s at the end of the period. Bz was generally neutral. ACE data suggested a solar sector boundary crossing from negative to positive sector around 31/14Z.
IIB. Geophysical Activity Forecast: The geomagentic field is
expected to be predominantly quiet for the next three days (01-03