Status Report

Joint USAF/NOAA Report of Solar and Geophysical Activity 06 May 2005

By SpaceRef Editor
May 7, 2005
Filed under , ,

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

Updated 2005 May 06 2210 UTC

Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 126 Issued at 2200Z on 06 May 2005

IA. Analysis of Solar Active Regions and Activity from 05/2100Z
to 06/2100Z: Solar activity was moderate. Region 756 (S08W79)
produced an M1 x-ray flare at 06/1128 UTC. This region continues to
slowly decay. Region 758 (S07E23) generated a more significant
flare, a C8/2f at 06/1705 UTC. Although smaller in x-ray output,
this flare was of long-duration and associated with a type II sweep
and an apparent Earth-directed CME. Both of these regions also
produced smaller flares over the past 24 hours.

IB. Solar Activity Forecast: Solar activity is expected to be low
to moderate. C-class activity is expected in Regions 756 and 758.
Another small M-class flare is possible.

IIA. Geophysical Activity Summary 05/2100Z to 06/2100Z:
The geomagnetic field was quiet to unsettled. A small Sudden Impulse
(8 nT) was observed by the Boulder magnetometer at 08/1306 UTC. The
greater than 2 MeV electron flux at geosynchronous orbit was high.

IIB. Geophysical Activity Forecast: The geomagnetic field is
expected to be quiet to unsettled for the next 24 hours. Increased
activity is possible on 08 and 09 May in response to the CME
discussed in Part IA. The field may also be affected by a coronal
hole high speed stream beginning on 09 May.

III. Event Probabilities 07 May-09 May

  • Class M 20/20/20
  • Class X 01/01/01
  • Proton 01/01/01
  • PCAF green

IV. Penticton 10.7 cm Flux

  • Observed 06 May 110
  • Predicted 07 May-09 May 105/095/090
  • 90 Day Mean 06 May 093

V. Geomagnetic A Indices

  • Observed Afr/Ap 05 May 003/006
  • Estimated Afr/Ap 06 May 005/006
  • Predicted Afr/Ap 07 May-09 May 010/012-020/025-020/025

VI. Geomagnetic Activity Probabilities 07 May-09 May

A. Middle Latitudes

  • Active 15/30/30
  • Minor storm 05/15/15
  • Major-severe storm 01/05/05

B. High Latitudes

  • Active 20/50/50
  • Minor storm 05/15/15
  • Major-severe storm 01/05/05

SpaceRef staff editor.