Status Report

Joint USAF/NOAA Report of Solar and Geophysical Activity 02 Sep 2005

By SpaceRef Editor
September 2, 2005
Filed under , ,

Prepared jointly by the U.S. Dept. of Commerce, NOAA,
Space Environment Center and the U.S. Air Force.
Updated 2005 Sep 02 2203 UTC

Joint USAF/NOAA Report of Solar and Geophysical Activity 02 Sep 2005
SDF Number 245 Issued at 2200Z on 02 Sep 2005

IA. Analysis of Solar Active Regions and Activity from 01/2100Z
to 02/2100Z: Solar activity was very low. Region 806 produced a
long duration B4 flare at 01/2321 UTC with an associated CME first
seen in LASCO imagery at 01/2354 UTC. This CME was a complex full
halo event, with the biggest contribution believed to have its
origin on the far side of the sun.

IB. Solar Activity Forecast: Solar activity is expected to be very
low to low. There is a chance for C-class activity from Region 805.

IIA. Geophysical Activity Summary 01/2100Z to 02/2100Z:
The geomagnetic field ranged from quiet to minor storm levels. Minor
storming occurred between 0600 – 0900 UTC and again between 1600 –
1800 UTC after the arrival of a transient shock at approximately
02/1340 UTC from the CME on 31 August. The greater than 2 MeV
electron flux at geosynchronous orbit reached high levels today.

IIB. Geophysical Activity Forecast: The geomagnetic field is
expected to be at active levels with a chance for isolated minor
storming on 02 September as the transient flow passes. The
geomagnetic field should be at unsettled levels on 03 September.
Unsettled to active conditions are expected on 04 September due to
the arrival of the CME associated with the long duration B4 flare.

III. Event Probabilities 03 Sep-05 Sep

  • Class M 05/05/05
  • Class X 01/01/01
  • Proton 01/01/01
  • PCAF green

IV. Penticton 10.7 cm Flux

  • Observed 02 Sep 077
  • Predicted 03 Sep-05 Sep 075/080/085
  • 90 Day Mean 02 Sep 093

V. Geomagnetic A Indices

  • Observed Afr/Ap 01 Sep 011/021
  • Estimated Afr/Ap 02 Sep 018/020
  • Predicted Afr/Ap 03 Sep-05 Sep 020/025-008/012-012/015

VI. Geomagnetic Activity Probabilities 03 Sep-05 Sep

A. Middle Latitudes

  • Active 35/15/20
  • Minor storm 20/10/15
  • Major-severe storm 10/05/05

B. High Latitudes

  • Active 40/20/25
  • Minor storm 30/15/20
  • Major-severe storm 20/05/05

SpaceRef staff editor.