Status Report

Joint USAF/NOAA Report of Solar and Geophysical Activity 23 Jan 2004

By SpaceRef Editor
January 23, 2004
Filed under , ,

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

Updated 2004 Jan 23 2210 UTC

Joint USAF/NOAA Report of Solar and Geophysical Activity

SDF Number 023 Issued at 2200Z on 23 Jan 2004

IA. Analysis of Solar Active Regions and Activity from 22/2100Z
to 23/2100Z: Solar activity was at very low levels again today.
Several low level B-class flares and minor discrete frequency radio
bursts highlighted today’s activity. All four active regions showed
decay during the period; Regions 540 (S14W61), 542 (N10W42), 543
(S16W47), and 544 (N08W30). All regions have lost their gamma
characteristics over the past two days. No new regions were
numbered this period.

IB. Solar Activity Forecast: Solar activity is expected to be at
very low to low levels. Region 544 remains capable of producing a
high level C-class flare.

IIA. Geophysical Activity Summary 22/2100Z to 23/2100Z:
The geomagnetic field ranged from unsettled to minor storm levels.
An apparent transient signature was observed to pass the ACE
spacecraft at approximately 23/1400Z which may be related to the
filament eruption and related CME from the southeastern solar
quadrant early on 19 Jan. The greater than 2 MeV electron flux at
geosynchronous orbit reached high levels again today.

IIB. Geophysical Activity Forecast: The geomagnetic field is
expected to be at predominantly unsettled to active levels through
the period. Isolated minor storm conditions may occur into 24 Jan
due to the recent transient activity.

III. Event Probabilities 24 Jan-26 Jan

  • Class M 20/15/15
  • Class X 05/05/05
  • Proton 01/01/01
  • PCAF green

IV. Penticton 10.7 cm Flux

  • Observed 23 Jan 115
  • Predicted 24 Jan-26 Jan 115/110/105
  • 90 Day Mean 23 Jan 135

V. Geomagnetic A Indices

  • Observed Afr/Ap 22 Jan 035/062
  • Estimated Afr/Ap 23 Jan 025/040
  • Predicted Afr/Ap 24 Jan-26 Jan 015/020-012/012-008/010

VI. Geomagnetic Activity Probabilities 24 Jan-26 Jan

A. Middle Latitudes

  • Active 30/25/15
  • Minor storm 15/10/05
  • Major-severe storm 05/05/01

B. High Latitudes

  • Active 35/25/20
  • Minor storm 20/15/10
  • Major-severe storm 10/05/01

SpaceRef staff editor.