Status Report

Joint USAF/NOAA Report of Solar and Geophysical Activity 25 Aug 2005

By SpaceRef Editor

August 25, 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 Aug 25 2203 UTC

Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 237 Issued at 2200Z on 25 Aug 2005

IA. Analysis of Solar Active Regions and Activity from 24/2100Z
to 25/2100Z: Solar activity was high. Region 803 (N12E67) produced
an impulsive M6/1n flare at 0440 UTC. The event was associated with
a CME off the east limb. Region 800 (N17W35) is currently the
largest on the disk but was quiet and stable. New Region 804
(N11E12) emerged on the disk today.

IB. Solar Activity Forecast: Solar activity is expected to be low,
but there is a chance for an isolated M-class event from Region 800
or Region 803 during the next three days (26-28 August).

IIA. Geophysical Activity Summary 24/2100Z to 25/2100Z:
The geomagnetic field was predominantly at active to minor storm
levels. Today’s solar wind data was generally consistent with a
coronal hole stream: velocities were elevated and the magnetic field
indicated ongoing wave-like fluctuations. The speed gradually
declined from initial values around 730 km/s to day-end values
around 620 km/s. The greater than 10 MeV proton event that began at
22/2040 UTC ended today at 25/0040 UTC. The peak flux was 330 PFU at
23/1045 UTC. The greater than 2 MeV electron flux at geosynchronous
orbit reached high levels.

IIB. Geophysical Activity Forecast: The geomagnetic field is
expected to be predominantly unsettled with a chance for isolated
active periods for 26 August. Conditions should be generally
unsettled for 27-28 August.

III. Event Probabilities 26 Aug-28 Aug