Viewing archive of Sunday, 23 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 23 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 143 Issued at 2200Z on 23 MAY 1999IA. Analysis of Solar Active Regions and Activity from 22-2100Z to 23-2100Z SOLAR ACTIVITY WAS LOW. THERE WERE EIGHT LOW-LEVEL
C-CLASS EVENTS DURING THE PAST 24 HOURS. OF THE REGIONS ON THE DISK,
8545 (N36W37), 8550 (S14E30), AND 8551 (N33E37) WERE THE MOST
ACTIVE. BOTH REGION 8545 AND 8551 HAVE COMPLICATED INVERSION LINES
BUT RELATIVELY WEAK MAGNETIC STRENGTHS NEAR THE APPARENT SHEAR
POINTS. REGION 8550 IS GROWING SLOWLY AND APPEARED TO BE FORMING A
MODERATE STRENGTH DELTA CONFIGURATION. NEW REGION 8552 (N21E80)
BEGAN TO ROTATE INTO VIEW TODAY WITH THE APPEARANCE OF A LEADER SPOT
WITH MATURE PENUMBRA.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE
MOSTLY LOW, BUT THERE IS A FAIR CHANCE FOR AN ISOLATED M-CLASS EVENT
SOMETIME DURING THE NEXT THREE DAYS.
IIA. Geophysical Activity Summary 22-2100Z to 23-2100Z
THE GEOMAGNETIC FIELD RANGED FROM QUIET TO ACTIVE LEVELS. THE GREATER
THAN 2 MEV ELECTRONS ATTAINED HIGH LEVELS DURING THE PAST 24 HOURS
BUT APPEARED TO BE DECREASING TOWARDS NORMAL BACKGROUND LEVELS NEAR
THE END OF THE REPORTING PERIOD.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE MOSTLY UNSETTLED FOR THE NEXT THREE DAYS. THERE IS AN
ENHANCED POSSIBILITY FOR SOME ACTIVE PERIODS ON THE THIRD DAY DUE TO
RECURRENCE EFFECTS.
III. Event Probabilities 24 MAY to 26 MAY
| Class M | 30% | 30% | 30% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 23 MAY 141 Predicted 24 MAY-26 MAY 143/145/145 90 Day Mean 23 MAY 128
V. Geomagnetic A Indices
OBSERVED AFR/AP 22 MAY 003/005 ESTIMATED AFR/AP 23 MAY 010/008 PREDICTED AFR/AP 24 MAY-26 MAY 010/012-010/012-015/012
VI. Geomagnetic Activity Probabilities 24 MAY to 26 MAY
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 25% |
| Minor storm | 05% | 05% | 10% |
| Major-severe storm | 01% | 01% | 05% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 30% |
| Minor storm | 10% | 10% | 15% |
| Major-severe storm | 05% | 05% | 10% |
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