:Product: Weekly Highlights and Forecasts
:Issued: 1999 Jul 13 2112 UT
HIGHLIGHTS OF SOLAR AND GEOMAGNETIC ACTIVITY
05 - 11 JULY 1999

SOLAR ACTIVITY WAS AT LOW LEVELS DURING THE WEEK, WITH THE EXCEPTION
OF A SINGLE M-CLASS EVENT THAT OCCURRED ON 05 JULY. REGION 8611
(S26,L=256, CLASS/AREA FAI/380 ON 05 JULY) PRODUCED AN M1/1F FLARE
AT 05/1848UT. NUMEROUS C-CLASS EVENTS WERE PRODUCED BY SEVERAL
DIFFERENT REGIONS, NONE OF WHICH APPEARED SIGNIFICANTLY COMPLEX.

REAL-TIME SOLAR WIND DATA WERE AVAILABLE FROM THE ADVANCED
COMPOSITION EXPLORER (ACE) SPACECRAFT FOR MOST OF THE PERIOD. A WEAK
INTERPLANETARY SHOCK FRONT PASSED THE SPACECRAFT AT APPROXIMATELY
06/1417UT. THE FOLLOWING CHANGES WERE OBSERVED WITH THE PASSAGE: A
VELOCITY INCREASE FROM 340 TO 420 KM/SEC FOLLOWED BY GRADUALLY
INCREASED VELOCITIES THAT PEAKED AT 550 KM/SEC AT 06/2100UT, A MINOR
DENSITY INCREASE, AND INCREASED NORTHWARD IMF BZ. THE SHOCK MAY HAVE
BEEN ASSOCIATED WITH A PARTIAL-HALO CME OBSERVED LATE ON 03 JULY.

NO PROTON EVENTS WERE DETECTED AT GEO-SYNCHRONOUS ORBIT DURING THE
PERIOD.

THE GREATER THAN 2 MEV ELECTRON FLUX AT GEO-SYNCHRONOUS ORBIT WAS AT
NORMAL TO MODERATE LEVELS.

THE GEOMAGNETIC FIELD WAS QUIET TO UNSETTLED DURING THE WEEK. A
SUDDEN IMPULSE WAS OBSERVED OF 5 NT WAS OBSERVED ON 06/1508UT. THERE
WAS NO SIGNIFICANT CORRESPONDING GEOMAGNETIC ACTIVITY FOLLOWING THE
EVENT. THE SUDDEN IMPULSE MAY HAVE BEEN THE RESULT OF A PARTIAL-HALO
CME OBSERVED ON 03 JULY.

FORECAST OF SOLAR AND GEOMAGNETIC ACTIVITY
14 JULY - 09 AUGUST 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 TO MODERATE LEVELS DURING MOST OF THE
PERIOD.

GEOMAGNETIC FIELD ACTIVITY IS EXPECTED TO BE AT QUIET TO UNSETTLED
LEVELS DURING MOST OF THE PERIOD, BARRING ANY EARTH-DIRECTED CMES.

.