Status Report

Joint USAF/NOAA Report of Solar and Geophysical Activity 01 Feb 2005

By SpaceRef Editor

February 1, 2005

Filed under Space Weather Prediction Center (NOAA), Space Weather Solar-Geophysical Activity, US

Prepared jointly by the U.S. Dept. of Commerce, NOAA,
Space Environment Center and the U.S. Air Force.

Updated 2005 Feb 01 2210 UTC

Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 032 Issued at 2200Z on 01 Feb 2005

IA. Analysis of Solar Active Regions and Activity from 31/2100Z
to 01/2100Z: Solar activity was very low. The two sunspot regions on
the visible disk, Regions 727 (S09W68) and 729 (S08E06), were quiet
and stable. A 9 degree filament erupted from near S15W16 at
01/0800Z, but there was no apparent CME on LASCO imagery. An
impressive backside full halo CME was observed on LASCO imagery at
01/1106Z. The likely source of this eruption was old Region 720
(N13, L=178), which is due to return to the visible disk on 05
February. A Type II radio sweep (660 km/s) and a 245 MHz burst of
9800 sfu were observed at 01/1032Z, and were likely associated with
this backside CME.

IB. Solar Activity Forecast: Solar activity is expected to be very
low. The activity level is expected to increase after 05 February
when old Region 720 returns to the visible disk.

IIA. Geophysical Activity Summary 31/2100Z to 01/2100Z:
The geomagnetic field was quiet to unsettled. Solar wind speed
remains elevated, but gradually declined from near 620 km/s to 530
km/s to end the period. The greater than 2 MeV electron flux at
geosynchronous orbit was at high levels today.

IIB. Geophysical Activity Forecast: The geomagnetic field is
expected to continue at quiet to unsettled levels.

III. Event Probabilities 02 Feb-04 Feb