:Product: 19990429RSGA.txt
:Issued: 1999 Apr 29 2200 UTC
# 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 119 ISSUED AT 2200Z ON 29 APR 1999
IA.  ANALYSIS OF SOLAR ACTIVE REGIONS AND ACTIVITY FROM  28/2100Z
TO 29/2100Z:  SOLAR ACTIVITY WAS MODERATE. REGION 8524 (N22W15)
PRODUCED AN M1/1B FLARE AT 29/1954UT. THIS REGION ALSO PRODUCED A
FEW C-CLASS SUBFLARES, THE LARGEST BEING A C3/SF AT 29/1741UT.
DEVELOPMENT IN THE 8524 AREA HAS MADE IDENTIFICATION OF THE SMALL
SUNSPOT GROUP JUST TO THE SOUTH, REGION 8522 (N17W14), DIFFICULT IF
NOT IMPOSSIBLE. THESE REGIONS WILL MOST LIKELY NEED TO BE COMBINED.
NEW REGION 8525 (N15E68) ROTATED AROUND THE EAST LIMB AND HAS
ALREADY PRODUCED C-CLASS ACTIVITY, A C2/SF AT 29/0829UT. THE AREA IS
STILL COMING INTO VIEW BUT DOES NOT YET APPEAR TO BE SIGNIFICANTLY
COMPLEX. NEW REGION 8526 (N22E35) WAS ALSO NUMBERED.
IB.  SOLAR ACTIVITY FORECAST:  SOLAR ACTIVITY IS EXPECTED TO BE LOW
TO MODERATE. C-CLASS ACTIVITY IS EXPECTED IN REGIONS 8524 AND 8525.
AN ADDITIONAL M-CLASS FLARE IS POSSIBLE IN REGION 8524.
IIA.  GEOPHYSICAL ACTIVITY SUMMARY FROM 28/2100Z TO 29/2100Z:
THE GEOMAGNETIC FIELD RANGED FROM QUIET TO ACTIVE.
IIB.  GEOPHYSICAL ACTIVITY FORECAST:  THE GEOMAGNETIC FIELD IS
EXPECTED TO BE UNSETTLED TO ACTIVE. EFFECTS FROM A HIGH-SPEED STREAM
ASSOCIATED WITH A FAVORABLY POSITIONED CORONAL HOLE ARE EXPECTED TO
BEGIN WITHIN THE FORECAST PERIOD. ISOLATED MINOR STORM CONDITIONS
ARE POSSIBLE IF THIS OCCURS.
III.  EVENT PROBABILITIES 30 APR-02 MAY
CLASS M    15/15/15
CLASS X    01/01/01
PROTON     01/01/01
PCAF       GREEN
IV.  PENTICTON 10.7 CM FLUX
OBSERVED           29 APR 122
PREDICTED   30 APR-02 MAY  125/130/135
90 DAY MEAN        29 APR 128
V.  GEOMAGNETIC A INDICES
OBSERVED AFR/AP 28 APR  014/019
ESTIMATED AFR/AP 29 APR  015/025
PREDICTED AFR/AP 30 APR-02 MAY  015/025-015/030-015/030
VI.  GEOMAGNETIC ACTIVITY PROBABILITIES 30 APR-02 MAY
A.  MIDDLE LATITUDES
ACTIVE                15/15/15
MINOR STORM           10/10/10
MAJOR-SEVERE STORM    05/05/05
B.  HIGH LATITUDES
ACTIVE                15/15/15
MINOR STORM           10/10/10
MAJOR-SEVERE STORM    05/05/05