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 UTCPrepared 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 1998IA. 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 M | 50% | 50% | 50% |
| Class X | 10% | 10% | 10% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
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 | |||
|---|---|---|---|
| Active | 30% | 30% | 25% |
| Minor storm | 10% | 10% | 10% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 35% | 35% | 30% |
| Minor storm | 20% | 20% | 20% |
| Major-severe storm | 01% | 01% | 01% |
All times in UTC
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