:Product: Report of Solar-Geophysical Activity
:Issued: 2000 Apr 26 2200 UT
# Prepared jointly by the U.S. Dept. of Commerce, NOAA,
#Space Environment Center and the U.S. Air Force.
#
JOINT USAF/NOAA REPORT OF SOLAR AND GEOPHYSICAL ACTIVITY
SDF NUMBER 117 ISSUED AT 2200Z ON 26 APR 2000
IA.  ANALYSIS OF SOLAR ACTIVE REGIONS AND ACTIVITY FROM  25/2100Z
TO 26/2100Z:  SOLAR ACTIVITY CONTINUED AT THE LOW LEVEL. A C6/SF
FLARE FROM REGION 8970 (S15E04) AT 0923Z WAS THE DAY'S LARGEST
EVENT. THAT SPOT GROUP MEASURES OVER 1,000 MILLIONTHS IN WHITE LIGHT
AREA, BUT HAS A FAIRLY SIMPLE MAGNETIC STRUCTURE. NEARBY REGION 8971
(N18E16), STILL IMPOSING IN WHITE LIGHT,  WAS STABLE.
IB.  SOLAR ACTIVITY FORECAST:  SOLAR ACTIVITY IS EXPECTED TO BE LOW
TO MODERATE. AN ISOLATED LOW-LEVEL M-CLASS EVENT MAY OCCUR FROM
REGION 8970 OR 8971.
IIA.  GEOPHYSICAL ACTIVITY SUMMARY FROM 25/2100Z TO 26/2100Z:
THE GEOMAGNETIC FIELD WAS QUIET.
IIB.  GEOPHYSICAL ACTIVITY FORECAST:  THE GEOMAGNETIC FIELD IS
EXPECTED TO BE QUIET TO UNSETTLED THROUGHOUT THE PERIOD.
III.  EVENT PROBABILITIES 27 APR-29 APR
CLASS M    30/30/30
CLASS X    01/01/01
PROTON     01/01/01
PCAF       GREEN
IV.  PENTICTON 10.7 CM FLUX
OBSERVED           26 APR 190
PREDICTED   27 APR-29 APR  185/180/175
90 DAY MEAN        26 APR 187
V.  GEOMAGNETIC A INDICES
OBSERVED AFR/AP 25 APR  007/006
ESTIMATED AFR/AP 26 APR  003/007
PREDICTED AFR/AP 27 APR-29 APR  010/015-010/015-010/012
VI.  GEOMAGNETIC ACTIVITY PROBABILITIES 27 APR-29 APR
A.  MIDDLE LATITUDES
ACTIVE                20/20/20
MINOR STORM           05/05/05
MAJOR-SEVERE STORM    01/01/01
B.  HIGH LATITUDES
ACTIVE                30/30/30
MINOR STORM           05/05/05
MAJOR-SEVERE STORM    01/01/01