Viewing archive of Sunday, 21 March 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 Mar 21 2200 UTC
Prepared by the NOAA © SWPC and processed by SpaceWeatherLive.com

Joint USAF/NOAA Report of Solar and Geophysical Activity

SDF Number 080 Issued at 2200Z on 21 MAR 1999

IA. Analysis of Solar Active Regions and Activity from 20-2100Z to 21-2100Z

SOLAR ACTIVITY WAS LOW. A C1 X-RAY FLARE OCCURRED AT 21/0642UT. NO OPTICAL FLARE REPORTS WERE RECEIVED DURING THE PAST DAY. ALL SUNSPOT REGIONS CURRENTLY ON THE DISK ARE RELATIVELY SMALL AND SIMPLE. REGIONS 8494 (S24W12) AND 8496 (S11W32) ARE GROWING SLOWLY.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE VERY LOW TO LOW. ISOLATED C-CLASS FLARES ARE POSSIBLE.
IIA. Geophysical Activity Summary 20-2100Z to 21-2100Z
THE GEOMAGNETIC FIELD WAS QUIET TO UNSETTLED.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS EXPECTED TO BE QUIET TO UNSETTLED.
III. Event Probabilities 22 MAR to 24 MAR
Class M01%01%01%
Class X01%01%01%
Proton01%01%01%
PCAFGREEN
IV. Penticton 10.7 cm Flux
  Observed       21 MAR 124
  Predicted   22 MAR-24 MAR  120/115/115
  90 Day Mean        21 MAR 142
V. Geomagnetic A Indices
OBSERVED AFR/AP 20 MAR  003/006
ESTIMATED AFR/AP 21 MAR  008/007
PREDICTED AFR/AP 22 MAR-24 MAR  010/005-005/007-005/009
VI. Geomagnetic Activity Probabilities 22 MAR to 24 MAR
A. Middle Latitudes
Active15%10%10%
Minor storm01%01%01%
Major-severe storm01%01%01%
B. High Latitudes
Active15%10%10%
Minor storm01%01%01%
Major-severe storm01%01%01%

All times in UTC

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