Viewing archive of Sunday, 10 May 1998

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 1998 May 10 2200 UTC
Prepared by the NOAA © SWPC and processed by SpaceWeatherLive.com

Joint USAF/NOAA Report of Solar and Geophysical Activity

SDF Number 130 Issued at 2200Z on 10 MAY 1998

IA. Analysis of Solar Active Regions and Activity from 09-2100Z to 10-2100Z

SOLAR ACTIVITY DECREASED TO MODERATE LEVELS. AN OPTICALLY UNCORRELATED M1 X-RAY FLARE WAS DETECTED AT 10/0826UT. NEWLY NUMBERED REGION 8220 (S31E82) PRODUCED AN M3/SF FLARE AT 10/1320UT ACCOMPANIED BY A 300 SFU TENFLARE. A LOOP PROMINENCE SYSTEM WAS OBSERVED IN THE WAKE OF THE FLARE AS WELL. THE REGION'S LEADER SPOT BEGAN TO ROTATE INTO VIEW LATE IN THE PERIOD AND APPEARED AS A MATURE H-, PERHAPS K-TYPE (DETAILS WERE DIFFICULT TO DISCERN DUE TO LIMB PROXIMITY). SPACE-BASED EUV AND X-RAY IMAGES SHOWED A MODERATELY COMPLEX MAGNETIC STRUCTURE ASSOCIATED WITH THIS REGION. REGION 8214 (N26W84) WAS STABLE AS IT BEGAN TO CROSS THE WEST LIMB. REGION 8218 (S20E22) REMAINED A STABLE E-TYPE.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE MODERATE. REGION 8220 IS EXPECTED TO PRODUCE ADDITIONAL M-CLASS FLARES. THERE IS A SLIGHT CHANCE FOR A MAJOR FLARE FROM THIS REGION AS WELL.
IIA. Geophysical Activity Summary 09-2100Z to 10-2100Z
THE GEOMAGNETIC FIELD WAS QUIET TO UNSETTLED. THE GREATER THAN 10 MEV PROTON FLUX REMAINED ENHANCED FOLLOWING YESTERDAY'S MAJOR FLARE, BUT GRADUALLY DECLINED TOWARDS BACKGROUND LEVELS. THE GREATER THAN 2 MEV ELECTRON FLUX REMAINED AT MODERATE TO HIGH LEVELS.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS EXPECTED TO REMAIN AT QUIET TO UNSETTLED LEVELS THROUGH THE PERIOD. THE GREATER THAN 10 MEV PROTON ENHANCEMENT IS EXPECTED TO RETURN TO BACKGROUND LEVELS EARLY IN THE PERIOD.
III. Event Probabilities 11 MAY to 13 MAY
Class M50%50%50%
Class X10%10%10%
Proton01%01%01%
PCAFGREEN
IV. Penticton 10.7 cm Flux
  Observed       10 MAY 107
  Predicted   11 MAY-13 MAY  108/108/108
  90 Day Mean        10 MAY 108
V. Geomagnetic A Indices
OBSERVED AFR/AP 09 MAY  008/012
ESTIMATED AFR/AP 10 MAY  010/010
PREDICTED AFR/AP 11 MAY-13 MAY  012/010-012/010-010/010
VI. Geomagnetic Activity Probabilities 11 MAY to 13 MAY
A. Middle Latitudes
Active30%30%25%
Minor storm10%10%10%
Major-severe storm01%01%01%
B. High Latitudes
Active35%35%30%
Minor storm20%20%20%
Major-severe storm01%01%01%

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