Viewing archive of Monday, 24 May 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 May 24 2200 UTC
Prepared by the NOAA © SWPC and processed by SpaceWeatherLive.com

Joint USAF/NOAA Report of Solar and Geophysical Activity

SDF Number 144 Issued at 2200Z on 24 MAY 1999

IA. Analysis of Solar Active Regions and Activity from 23-2100Z to 24-2100Z

SOLAR ACTIVITY WAS LOW. THE PERIOD WAS CHARACTERIZED BY A NUMBER OF SMALL C-CLASS X-RAY FLARES. THE LARGEST WAS A C3.3 FROM NEWLY ASSIGNED REGION 8552 (N20E68). REPEATING THE TREND OF YESTERDAY, REGIONS 8550 (S14E17), 8551 (N32E25) AND 8552 WERE THE MOST ACTIVE. REGION 8550 CONTINUES TO DISPLAY A COMPLICATED INVERSION LINE WITH A POSSIBLE MAGNETIC DELTA CONFIGURATION.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO REMAIN LOW WITH A CHANCE FOR AN ISOLATED M-CLASS X-RAY EVENT.
IIA. Geophysical Activity Summary 23-2100Z to 24-2100Z
THE GEOMAGNETIC FIELD RANGED FROM QUIET TO UNSETTLED WITH ONE 3 HOUR PERIOD OF ACTIVE CONDITIONS.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS EXPECTED TO BE QUIET TO UNSETTLED.
III. Event Probabilities 25 MAY to 27 MAY
Class M30%30%30%
Class X01%01%01%
Proton01%01%01%
PCAFGREEN
IV. Penticton 10.7 cm Flux
  Observed       24 MAY 137
  Predicted   25 MAY-27 MAY  140/145/145
  90 Day Mean        24 MAY 128
V. Geomagnetic A Indices
OBSERVED AFR/AP 23 MAY  008/010
ESTIMATED AFR/AP 24 MAY  008/012
PREDICTED AFR/AP 25 MAY-27 MAY  008/012-008/012-008/010
VI. Geomagnetic Activity Probabilities 25 MAY to 27 MAY
A. Middle Latitudes
Active20%20%20%
Minor storm05%05%05%
Major-severe storm01%01%01%
B. High Latitudes
Active25%25%20%
Minor storm05%05%05%
Major-severe storm01%01%01%

All times in UTC

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