Viewing archive of Friday, 19 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 19 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 140 Issued at 2200Z on 19 MAY 2000IA. Analysis of Solar Active Regions and Activity from 18-2100Z to 19-2100Z
ACTIVITY REMAINED AT MODERATE LEVELS BY VIRTUE OF AN
OPTICALLY UNCORRELATED M1 AT 19/0058Z. REGIONS 8996 (S21W22), 8998
(S12W09), AND 9002 (N18E18) REMAINED LARGE REGIONS OF MODERATE
MAGNETIC COMPLEXITY, BUT SHOWED NO SIGNIFICANT CHANGES. EACH
PRODUCED OCCASIONAL C -CLASS SUBFLARES. THE REMAINING REGIONS WERE
STABLE. NEW REGION 9011 (N19E69), AN H-TYPE GROUP TRAILING REGION
9010 (N20E57), ROTATED INTO VIEW DURING THE PERIOD.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO REMAIN
AT MODERATE LEVELS. REGIONS 8996, 8998, AND 9002 EACH APPEAR CAPABLE
OF M-CLASS FLARE PRODUCTION. THERE IS ALSO A SLIGHT CHANCE FOR A
MAJOR FLARE SOMETIME DURING THE PERIOD.
IIA. Geophysical Activity Summary 18-2100Z to 19-2100Z
GEOMAGNETIC FIELD ACTIVITY REMAINED AT QUIET TO UNSETTLED LEVELS.
IIB. Geophysical Activity Forecast
GEOMAGNETIC FIELD ACTIVITY IS
EXPECTED TO RANGE FROM QUIET TO ACTIVE LEVELS. BRIEF ACTIVE LEVELS
ARE POSSIBLE DURING THE PERIOD DUE TO CORONAL HOLE EFFECTS.
III. Event Probabilities 20 MAY to 22 MAY
| Class M | 80% | 80% | 80% |
| Class X | 15% | 15% | 15% |
| Proton | 10% | 10% | 10% |
| PCAF | YELLOW | ||
IV. Penticton 10.7 cm Flux
Observed 19 MAY 254 Predicted 20 MAY-22 MAY 260/260/265 90 Day Mean 19 MAY 194
V. Geomagnetic A Indices
OBSERVED AFR/AP 18 MAY 008/010 ESTIMATED AFR/AP 19 MAY 012/008 PREDICTED AFR/AP 20 MAY-22 MAY 015/012-015/012-012/010
VI. Geomagnetic Activity Probabilities 20 MAY to 22 MAY
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 30% | 30% | 25% |
| Minor storm | 15% | 15% | 10% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 35% | 35% | 30% |
| Minor storm | 20% | 20% | 15% |
| Major-severe storm | 01% | 01% | 01% |
All times in UTC
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