FROM SPACE ENVIRONMENT SERVICES CENTER, BOULDER, COLORADO
SDF NUMBER 159
JOINT USAF/NOAA REPORT OF SOLAR AND GEOPHYSICAL ACTIVITY.
ISSUED 2200Z 07 JUN 1988
IA.  ANALYSIS OF SOLAR ACTIVE REGIONS AND ACTIVITY FROM 06/2100Z
TO 07/2100Z:  SOLAR ACTIVITY HAS BEEN LOW. NUMEROUS SUBFLARES
WERE OBSERVED DURING THE PERIOD, NONE OF WHICH WERE IMPRESSIVE
IN OPTICAL OR RADIO ASPECTS. THE LARGEST OF THE SUBFLARES WAS
A C2/SF AT 07/0618Z ACCOMPANIED BY A MINOR DISCRETE FREQUENCY
BURST AT 2695 MHZ. REGION 5038 (S25W50) REMAINED IN A GROWTH
PHASE THROUGHOUT THE PERIOD DISPLAYING A STRONG ARCH-FILAMENT
SYSTEM. NEW REGION 5040 (N27W21) WAS NUMBERED TODAY. THIS
REGION WAS FORMERLY THE TRAILER PORTION OF REGION 5031 (N26W38).
NEWLY ASSIGNED REGION 5041 (N15E78) EMERGED AS AN H-TYPE SPOT
LATE IN THE PERIOD.
IB.  SOLAR ACTIVITY FORECAST:  SOLAR ACTIVITY IS EXPECTED TO BE
LOW. THERE IS A SLIGHT CHANCE OF MODERATE ACTIVITY FROM REGIONS
5036 (S17E45) AND 5038.
IIA.  GEOPHYSICAL ACTIVITY SUMMARY FROM 06/2100Z TO 07/2100Z:
THE GEOMAGNETIC FIELD HAS BEEN AT MOSTLY QUIET LEVELS
FOR THE PAST 24 HOURS AT MIDDLE LATITUDES. THE HIGH LATITUDE
FIELD WAS UNSETTLED TO OCCASIONALLY ACTIVE.
IIB.  GEOPHYSICAL ACTIVITY FORECAST:  THE MIDDLE LATITUDE
GEOMAGNETIC FIELD IS EXPECTED TO BE ACTIVE TOMORROW
BECOMING UNSETTLED ON THE SECOND DAY DECLINING
TO QUIET CONDITIONS ON THE FINAL DAY OF THE FORECAST
PERIOD. THE HIGH LATITUDE FIELD IS EXPECTED TO BE
ACTIVE ON DAY ONE FOLLOWED BY TWO DAYS OF UNSETTLED
CONDITIONS.
III.  EVENT PROBABILITIES 08 JUN-10 JUN
CLASS M    20/20/20
CLASS X    01/01/01
PROTON     01/01/01
PCAF       GREEN
IV.  OTTAWA 10.7 CM FLUX
OBSERVED           07 JUN  160
PREDICTED   08 JUN-10 JUN  160/160/160
90 DAY MEAN        07 JUN  122
V.  GEOMAGNETIC A INDICES
OBSERVED  AFR/AP 06 JUN  009/019
ESTIMATED AFR/AP 07 JUN  008/015
PREDICTED AFR/AP 08 JUN-10 JUN  018/020-014/015-007/015