Viewing archive of Sunday, 26 September 1999

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 1999 Sep 26 2200 UTC
Prepared by the NOAA © SWPC and processed by SpaceWeatherLive.com

Joint USAF/NOAA Report of Solar and Geophysical Activity

SDF Number 269 Issued at 2200Z on 26 SEP 1999

IA. Analysis of Solar Active Regions and Activity from 25-2100Z to 26-2100Z

SOLAR ACTIVITY WAS LOW DUE TO A SINGLE C-CLASS EVENT, AN UNCORRELATED C1 X-RAY FLARE AT 26/0033UT. ACTIVITY FOR THE REST OF THE PERIOD WAS VERY LOW.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE VERY LOW TO LOW.
IIA. Geophysical Activity Summary 25-2100Z to 26-2100Z
THE GEOMAGNETIC FIELD WAS MOSTLY QUIET TO UNSETTLED WITH A PERIOD OF MINOR STORMING FROM 26/15-1800UT.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS EXPECTED TO BE QUIET TO ACTIVE FOR THE FIRST DAY OF THE FORECAST PERIOD AND QUIET TO UNSETTLED FOR THE REMAINDER OF THE PERIOD.
III. Event Probabilities 27 SEP to 29 SEP
Class M01%01%01%
Class X01%01%01%
Proton01%01%01%
PCAFGREEN
IV. Penticton 10.7 cm Flux
  Observed       26 SEP 123
  Predicted   27 SEP-29 SEP  120/120/115
  90 Day Mean        26 SEP 160
V. Geomagnetic A Indices
OBSERVED AFR/AP 25 SEP  001/004
ESTIMATED AFR/AP 26 SEP  010/010
PREDICTED AFR/AP 27 SEP-29 SEP  015/020-010/012-010/008
VI. Geomagnetic Activity Probabilities 27 SEP to 29 SEP
A. Middle Latitudes
Active20%15%15%
Minor storm10%05%05%
Major-severe storm01%01%01%
B. High Latitudes
Active25%15%15%
Minor storm15%10%10%
Major-severe storm01%01%01%

All times in UTC

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