Status Report

Joint USAF/NOAA Report of Solar and Geophysical Activity 30 Sep 2008

By SpaceRef Editor

September 30, 2008

Filed under exploration, Space Weather Prediction Center (NOAA), US

Product: Report of Solar-Geophysical Activity
Issued: 2008 Sep 30 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 274 Issued at 2200Z on 30 Sep 2008

IA. Analysis of Solar Active Regions and Activity from 29/2100Z to 30/2100Z: Solar activity was at very low levels.

IB. Solar Activity Forecast: Solar activity is expected to remain at very low levels.

IIA. Geophysical Activity Summary 29/2100Z to 30/2100Z: The geomagnetic field was at quiet levels. Solar wind speed values measured by the ACE spacecraft began the period at approximately 350 km/s. At around 1130Z on 30 September a Co-rotating Interaction Region (CIR) was observed at ACE. In association with the CIR wind speeds gradually increased to end the period at about 500 km/s with interplanetary magnetic field Bz values ranging between +/- 7 nT.

IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be at unsettled to minor storm levels with a chance for major storm periods at high latitudes for day one (01 October) of the forecast period. The increase in activity is due to a recurrent coronal hole high speed stream rotating into a geoeffective position. The coronal hole is expected to remain geoeffective days two and three (02 and 03 October) of the forecast period. However, activity should decrease to quiet to unsettled levels with a chance for isolated active levels at high latitudes.

III. Event Probabilities 01 Oct-03 Oct