Status Report

Joint USAF/NOAA Report of Solar and Geophysical Activity 09 Aug 2004

By SpaceRef Editor
August 9, 2004
Filed under , ,

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

Updated 2004 Aug 09 2210 UTC

Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 222 Issued at 2200Z on 09 Aug 2004

IA. Analysis of Solar Active Regions and Activity from 08/2100Z
to 09/2100Z: Solar activity was low. Today’s activity consisted of
numerous C-class flares from Region 656 (S12E31). This region grew
rapidly during the past 24 hours and has formed into a compact
configuration that includes a magnetic delta configuration and also
is exhibiting magnetic shear along part of the inversion line. The
other two numbered regions on the disk were quiet and stable.

IB. Solar Activity Forecast: Solar activity is expected to be low
to moderate. Additional C-class flares are expected from Region 656.
There is a good chance for an isolated M-class flare from this
region over the next three days. There is a slight chance for a
major flare from this region as well, especially if the current
growth trend continues.

IIA. Geophysical Activity Summary 08/2100Z to 09/2100Z:
The geomagnetic field was mostly quiet to unsettled during the past
24 hours, with the exception of an active period from 0600-0900 UTC.
The enhanced activity corresponded to a solar sector boundary
crossing observed in the solar wind data.

IIB. Geophysical Activity Forecast: The geomagnetic field is
expected to be predominantly unsettled for the next three days
(10-12 August), with a slight chance for isolated active periods.

III. Event Probabilities 10 Aug-12 Aug

  • Class M 40/40/40
  • Class X 10/10/10
  • Proton 05/05/05
  • PCAF green

IV. Penticton 10.7 cm Flux

  • Observed 09 Aug 114
  • Predicted 10 Aug-12 Aug 115/120/125
  • 90 Day Mean 09 Aug 106

V. Geomagnetic A Indices

  • Observed Afr/Ap 08 Aug 002/005
  • Estimated Afr/Ap 09 Aug 010/012
  • Predicted Afr/Ap 10 Aug-12 Aug 010/010-010/010-008/010

VI. Geomagnetic Activity Probabilities 10 Aug-12 Aug

A. Middle Latitudes

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

B. High Latitudes

  • Active 35/35/30
  • Minor storm 15/15/15
  • Major-severe storm 05/05/05

SpaceRef staff editor.