FROM SPACE ENVIRONMENT SERVICES CENTER, BOULDER, COLORADO
SDF NUMBER 255
JOINT USAF/NOAA REPORT OF SOLAR AND GEOPHYSICAL ACTIVITY.
ISSUED 2200Z 11 SEP 1988
IA.  ANALYSIS OF SOLAR ACTIVE REGIONS AND ACTIVITY FROM 10/2100Z
TO 11/2100Z:  SOLAR ACTIVITY HAS BEEN LOW.  NEW REGION 5148
(S10E70) ROTATED AROUND THE EAST LIMB AS A D-TYPE SUNSPOT
GROUP.  THIS REGION MAY BE THE SOURCE OF THE CORONAL YELLOW
LINE EMISSION REPORTED IN SDF 252.
IB.  SOLAR ACTIVITY FORECAST:  SOLAR ACTIVITY IS EXPECTED TO BE
LOW.  THERE IS A VERY SLIGHT CHANCE OF M-CLASS ACTIVITY.
IIA.  GEOPHYSICAL ACTIVITY SUMMARY FROM 10/2100Z TO 11/2100Z:
THE GEOMAGNETIC FIELD HAS BEEN AT ACTIVE TO MAJOR STORM
LEVELS.  THIS ACTIVITY IS BELIEVED TO BE THE RESULT OF CORONAL
HOLE EFFECTS.
IIB.  GEOPHYSICAL ACTIVITY FORECAST:  THE GEOMAGNETIC FIELD IS
EXPECTED TO BE AT ACTIVE TO STORM LEVELS ON 12 SEPTEMBER AND
UNSETTLED TO ACTIVE THEREAFTER.
III.  EVENT PROBABILITIES 12 SEP-14 SEP
CLASS M    10/10/10
CLASS X    01/01/01
PROTON     01/01/01
PCAF       GREEN
IV.  OTTAWA 10.7 CM FLUX
OBSERVED           11 SEP  120
PREDICTED   12 SEP-14 SEP  124/128/128
90 DAY MEAN        11 SEP  150
V.  GEOMAGNETIC A INDICES
OBSERVED  AFR/AP 10 SEP  008/017
ESTIMATED AFR/AP 11 SEP  025/048
PREDICTED AFR/AP 12 SEP-14 SEP  018/035-010/025-007/020