Status Report

Joint USAF/NOAA Report of Solar and Geophysical Activity 31 Oct 2005

By SpaceRef Editor

October 31, 2005

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

Joint USAF/NOAA Report of Solar and Geophysical Activity 31 Oct 2005 — http://images.spaceref.com/news/sun.5.jpg

Prepared jointly by the U.S. Dept. of Commerce, NOAA,
Space Environment Center and the U.S. Air Force. Updated 2005 Oct 31 2204 UTC

Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 304 Issued at 2200Z on 31 Oct 2005

IA. Analysis of Solar Active Regions and Activity from 30/2100Z to 31/2100Z: Solar activity continued at very low levels. A B8 flare was observed at 31/1643Z from near S03 on the east limb. This area of bright emission on the southeast limb is likely the return of old Region 814 (S08, L=228). A new bipolar sunspot group was numbered today as Region 819 (S09E26). This spot group emerged in close proximity to Region 818 (S08E32), which is also a small beta group in a slow growth phase.

IB. Solar Activity Forecast: Solar activity is expected to be very low to low. Isolated C-class flares are possible from the tightly grouped Regions 818 and 819. A C-class flare is also possible from old active Region 814, which is rotating into view on the southeast limb.

IIA. Geophysical Activity Summary 30/2100Z to 31/2100Z: The geomagnetic field was quiet to active. The most disturbed conditions were associated with a period of sustained southward IMF Bz that began at around 31/0900Z and persisted through the remainder of the period.

IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be quiet to unsettled with isolated active periods. A recurrent coronal hole high speed stream is expected to rotate into a geoeffective position on 03 November.

III. Event Probabilities 01 Nov-03 Nov