Viewing archive of Thursday, 18 December 2003

Solar activity report

Any mentioned solar flare in this report has a scaling factor applied by the Space Weather Prediction Center (SWPC). Because of the SWPC scaling factor, solar flares are reported as 42% smaller than for the science quality data. The scaling factor has been removed from our archived solar flare data to reflect the true physical units.
Report of Solar-Geophysical Activity 2003 Dec 18 2200 UTC
Prepared by the NOAA © SWPC and processed by

Joint USAF/NOAA Report of Solar and Geophysical Activity

SDF Number 352 Issued at 2200Z on 18 Dec 2003

IA. Analysis of Solar Active Regions and Activity from 17-2100Z to 18-2100Z

Solar activity has been low. Several C-class flares occurred over the period, including a C8.6/Sf at 18/0931Z from Region 525 (N09E44). New Region 528 (N08E71) was numbered today, and it produced several C-class flares including a C5.5 at 18/1209Z.
IB. Solar Activity Forecast
Solar activity is expected to be low to moderate, with possible isolated major flares from Regions 525 and 528.
IIA. Geophysical Activity Summary 17-2100Z to 18-2100Z
The geomagnetic field has been quiet to unsettled. The greater than 2 MeV electron flux at geosynchronous orbit remained at high levels today.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected to increase from quiet to active levels over the next three days. Isolated minor storming is possible due to the arrival of high speed solar wind from a coronal hole moving into geoeffective position beginning 19-20 December.
III. Event Probabilities 19 Dec to 21 Dec
Class M20%20%20%
Class X05%05%05%
IV. Penticton 10.7 cm Flux
  Observed       18 Dec 123
  Predicted   19 Dec-21 Dec  130/135/135
  90 Day Mean        18 Dec 137
V. Geomagnetic A Indices
  Observed Afr/Ap 17 Dec  004/010
  Estimated     Afr/Ap 18 Dec  008/010
  Predicted    Afr/Ap 19 Dec-21 Dec  015/015-015/020-010/015
VI. Geomagnetic Activity Probabilities 19 Dec to 21 Dec
A. Middle Latitudes
Minor storm20%20%10%
Major-severe storm05%05%01%
B. High Latitudes
Minor storm25%30%20%
Major-severe storm10%10%05%

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