:Product: Weekly Highlights and Forecasts
:Issued: 1999 Jun 23 2112 UT
HIGHLIGHTS OF SOLAR AND GEOMAGNETIC ACTIVITY
14 - 20 JUNE 1999

SOLAR ACTIVITY RANGED FROM LOW TO MODERATE LEVELS DURING THE WEEK.
ACTIVITY WAS LOW THROUGH 16 JUNE WITH ISOLATED C-CLASS SUBFLARES AND
A WEAK, OPTICALLY UNCORRELATED TYPE II RADIO SWEEP AT 16/0328UT.
ACTIVITY INCREASED TO MODERATE LEVELS ON 17 JUNE DUE TO AN M3 X-RAY
FLARE AT 17/1730UT WITH AN ASSOCIATED WEAK TYPE II RADIO SWEEP.
SPACE-BASED SENSORS INDICATED THAT REGION 8569 (N19, L = 189,
CLASS/AREA EKI/370 ON 14 JUN) PRODUCED THIS FLARE AS IT WAS CROSSING
THE WEST LIMB. ACTIVITY DROPPED BACK TO LOW LEVELS DURING 18 - 19
JUNE ALTHOUGH THE FREQUENCY OF C-CLASS FLARES INCREASED. SPACE-BASED
IMAGES SHOWED THAT MOST OF THESE ORIGINATED FROM BEYOND THE WEST
LIMB INCLUDING A C5 AT 18/1657UT WITH AN ASSOCIATED TYPE II RADIO
SWEEP. ACTIVITY AGAIN INCREASED TO MODERATE LEVELS ON THE LAST DAY
OF THE PERIOD BY VIRTUE OF AN M2/SB FLARE AT 20/1535UT FROM REGION
8592 (N23, L=346, CLASS/AREA FAO/200 ON 20 JUNE) WITH MINOR RADIO
EMISSION. REGION 8592 ALSO PRODUCED A LONG-DURATION C5/SF FLARE AT
20/2007UT. THIS APPEARED TO HERALD THE RETURN OF OLD REGION 8552
(N19, L=346) WHICH PRODUCED A PROTON EVENT DURING ITS PREVIOUS
ROTATION.

REAL-TIME SOLAR WIND DATA WERE AVAILABLE FROM THE ADVANCED
COMPOSITION EXPLORER (ACE) SPACECRAFT FOR MOST OF THE PERIOD. PHI
DATA INDICATED A SHIFT TO AN AWAY (POSITIVE POLARITY) SECTOR ON 15
JUNE ACCOMPANIED BY INCREASED IMF BZ VARIABILITY (MAXIMUM SOUTHERLY
DEFLECTIONS TO MINUS 08 NT (GSM)), ENHANCED DENSITIES, AND A SLIGHT
INCREASE IN VELOCITIES.

THERE WERE NO PROTON ENHANCEMENTS AT GEO-SYNCHRONOUS ORBIT DURING THE
PERIOD.

THE GREATER THAN 2 MEV ELECTRON FLUX AT GEO-SYNCHRONOUS ALTITUDE WAS
AT NORMAL LEVELS DURING MOST OF THE PERIOD.

THE GEOMAGNETIC FIELD WAS AT QUIET LEVELS DURING MOST OF THE PERIOD.

FORECAST OF SOLAR AND GEOMAGNETIC ACTIVITY
23 JUNE - 19 JULY 1999

SOLAR ACTIVITY IS EXPECTED TO RANGE FROM LOW TO MODERATE LEVELS.
ISOLATED M-CLASS FLARES MAY OCCUR AT ANY TIME DURING THE PERIOD.
THERE WILL ALSO BE A SLIGHT CHANCE FOR A MAJOR FLARE SOMETIME DURING
THE PERIOD.

THERE WILL BE A SLIGHT CHANCE FOR A PROTON EVENT AT GEO-SYNCHRONOUS
ALTITUDE.

THE GREATER THAN 2 MEV ELECTRON FLUX AT GEO-SYNCHRONOUS ALTITUDE IS
EXPECTED TO BE AT  NORMAL LEVELS DURING MOST OF THE PERIOD.

GEOMAGNETIC FIELD ACTIVITY IS EXPECTED TO BE QUIET TO UNSETTLED,
BARRING ANY EARTH-DIRECTED CME OCCURRENCES.


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