Viewing archive of Thursday, 18 May 2000
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 2000 May 18 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 139 Issued at 2200Z on 18 MAY 2000IA. Analysis of Solar Active Regions and Activity from 17-2100Z to 18-2100Z SOLAR ACTIVITY INCREASED TO MODERATE LEVELS. REGION
9002 (N18E31) PRODUCED AN IMPULSIVE M2/2B FLARE AT 18/1557Z ALONG
WITH OCCASIONAL C-CLASS SUBFLARES. THIS REGION SHOWED LITTLE CHANGE
DURING THE PERIOD AND REMAINED A LARGE REGION WITH A MIXED-POLARITY
STRUCTURE. REGION 8998 (S13E04), A MODERATE-SIZED MIXED-POLARITY
GROUP, PRODUCED ISOLATED C-CLASS SUBFLARES AND SHOWED GRADUAL
DEVELOPMENT. REGION 8996 (S21W09) REMAINED THE LARGEST GROUP ON THE
DISK WITH AN AREA EXCEEDING 1200 MILLIONTHS AND RETAINED A
MIXED-POLARITY STRUCTURE. IT PRODUCED OCCASIONAL C-CLASS SUBFLARES.
NEW REGIONS 9009 (S15E68) AND 9010 (N16E74) WERE NUMBERED TODAY.
IB. Solar Activity Forecast
ACTIVITY IS EXPECTED TO REMAIN AT
MODERATE LEVELS. ISOLATED M-CLASS FLARES ARE LIKELY. THERE IS ALSO A
SLIGHT CHANCE FOR A MAJOR FLARE SOMETIME DURING THE PERIOD.
IIA. Geophysical Activity Summary 17-2100Z to 18-2100Z
GEOMAGNETIC FIELD ACTIVITY WAS AT QUIET TO UNSETTLED LEVELS.
IIB. Geophysical Activity Forecast
GEOMAGNETIC FIELD ACTIVITY IS
EXPECTED TO REMAIN AT QUIET TO UNSETTLED LEVELS DURING THE FIRST
DAY. ACTIVITY IS EXPECTED TO INCREASE DURING THE LAST TWO DAYS OF
THE PERIOD WITH UNSETTLED TO ACTIVE PERIODS POSSIBLE DUE TO CORONAL
HOLE EFFECTS.
III. Event Probabilities 19 MAY to 21 MAY
| Class M | 80% | 80% | 80% |
| Class X | 15% | 15% | 15% |
| Proton | 10% | 10% | 10% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 18 MAY 253 Predicted 19 MAY-21 MAY 260/265/265 90 Day Mean 18 MAY 193
V. Geomagnetic A Indices
OBSERVED AFR/AP 17 MAY 020/022 ESTIMATED AFR/AP 18 MAY 010/010 PREDICTED AFR/AP 19 MAY-21 MAY 012/012-015/015-015/015
VI. Geomagnetic Activity Probabilities 19 MAY to 21 MAY
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 25% | 30% | 30% |
| Minor storm | 10% | 15% | 15% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 30% | 35% | 35% |
| Minor storm | 15% | 20% | 20% |
| Major-severe storm | 01% | 01% | 01% |
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