:Product: 19981219SGAS.txt
:Issued: 1998 Dec 19 0245 UTC
# Prepared jointly by the U.S. Dept. of Commerce, NOAA,
# Space Environment Center and the U.S. Air Force.
#
JOINT USAF/NOAA SOLAR AND GEOPHYSICAL ACTIVITY SUMMARY
SGAS NUMBER 353 ISSUED AT 0245Z ON 19 DEC 1998
THIS REPORT IS COMPILED FROM DATA RECEIVED AT SWO ON 18 DEC
A.  ENERGETIC EVENTS
BEGIN  MAX  END  RGN   LOC   XRAY  OP 245MHZ 10CM   SWEEP
0514 0527 0530  8415 N18E69 C3.4  SF 790
0537 0537 0538                       240
1247 1252 1254  8409 S29W66 C2.9  SF 2200
1713 1722 1727  8415 N19E64 M8.0  2N        880    II
1729 1730 1737                       17     170
1814 1814 1823                       4600
1819 1819 1819                       1200
2247 2247 2248                       250
B.  PROTON EVENTS:  NONE
C.  GEOMAGNETIC ACTIVITY SUMMARY:  THE GEOMAGNETIC FIELD WAS QUIET.
D.  STRATWARM:  STRATWARM ALERT/FRIDAY/STRATWARM EXISTS.
MAJOR WARMING EXISTS.
THE STRONG ANTICYCLONE OVER THE CANADIAN ARCTIC MOVES
NORTHWARDS. VERY INTENSE WARMING OVER THE POLAR REGION
CONTINUES. TODAY, THE WARM AIR COVERS THE EUROPEAN ARCTIC
TOO, THEREFORE THE COLD REGION IS DISPLACED SOUTH OF 50 N
OVER NORTH ATLANTIC AND EUROPE. THE MAIN VORTEX EXISTS
OVER SOUTHERN URAL AREA AND A WEAKER SECOND VORTEX
EXISTS OVER NEWFOUNDLAND.
MEAN ZONAL WIND AT 60N IS FROM EAST AT 10 HPA AND
ABOVE IN THE UPPER STRATOSPHERE AND TEMPERATURE GRADIENT
REVERSED BETWEEN 60N AND THE POLE IN THE WHOLE STRATOSPHERE.
E.  DAILY INDICES: (REAL-TIME PRELIMINARY/ESTIMATED VALUES)
10 CM 155  SSN 076  AFR/AP 002/003   X-RAY BACKGROUND C1.0
DAILY PROTON FLUENCE (FLUX ACCUMULATION OVER 24 HRS)
GT 1 MEV 2.0E+05   GT 10 MEV 1.6E+04 P/(CM2-STER-DAY)
(GOES-8 SATELLITE SYNCHRONOUS ORBIT W75 DEGREES)
DAILY ELECTRON FLUENCE
GT 2 MEV 7.30E+06 E/(CM2-STER-DAY)
(GOES-8 SATELLITE SYNCHRONOUS ORBIT W75 DEGREES)
3 HOUR K-INDICES:
BOULDER 0 0 1 2 1 2 1 0 PLANETARY 0 0 0 2 1 1 1 0
F.  COMMENTS:  NONE