Press Release

NOAA/USAF Report of Solar-Geophysical Activity 25 Apr 2000

By SpaceRef Editor
April 25, 2000
Filed under

:Product: Report of Solar-Geophysical Activity
:Issued: 2000 Apr 25 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 116 ISSUED AT 2200Z ON 25 APR 2000
IA. ANALYSIS OF SOLAR ACTIVE REGIONS AND ACTIVITY FROM 24/2100Z
TO 25/2100Z: SOLAR ACTIVITY CONTINUED LOW. MOST OF THE ACTIVITY
ORIGINATED IN REGION 8972 (N34W47). REGIONS 8970 (S15E18) AND 8971
(N18E16) REMAIN IMPRESSIVE IN WHITE LIGHT AND H-ALPHA, BUT AS YET
HAVE BEEN LARGELY UNPRODUCTIVE. LITTLE ELSE OF SIGNIFICANCE
OCCURRED.
IB. SOLAR ACTIVITY FORECAST: SOLAR ACTIVITY IS EXPECTED TO BE LOW
TO MODERATE. AN ISOLATED M-CLASS EVENT MAY ORIGINATE FROM EITHER
REGION 8970, 8971 OR 8972.
IIA. GEOPHYSICAL ACTIVITY SUMMARY FROM 24/2100Z TO 25/2100Z:
THE GEOMAGNETIC FIELD WAS QUIET TO UNSETTLED.
IIB. GEOPHYSICAL ACTIVITY FORECAST: THE GEOMAGNETIC FIELD IS
EXPECTED TO BE UNSETTLED THROUGHOUT THE PERIOD.
III. EVENT PROBABILITIES 26 APR-28 APR
CLASS M 30/30/30
CLASS X 01/01/01
PROTON 01/01/01
PCAF GREEN
IV. PENTICTON 10.7 CM FLUX
OBSERVED 25 APR 203
PREDICTED 26 APR-28 APR 205/205/200
90 DAY MEAN 25 APR 186
V. GEOMAGNETIC A INDICES
OBSERVED AFR/AP 24 APR 014/021
ESTIMATED AFR/AP 25 APR 005/009
PREDICTED AFR/AP 26 APR-28 APR 010/015-010/012-010/010
VI. GEOMAGNETIC ACTIVITY PROBABILITIES 26 APR-28 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

SpaceRef staff editor.