[Ips-hf-warning] IPS HF COMMS WARNING

[rwc]

SUBJ: IPS PRELIMINARY HF RADIO COMMUNICATIONS WARNING 03/47
ISSUED AT 18/0224Z JUNE 2003
BY THE AUSTRALIAN SPACE FORECAST CENTRE.

DEGRADED HF PROPAGATION CONDITIONS EXPECTED
FROM 19-21 JUNE 2003 FOR MID TO HIGH LATITUDES.

DEGRADED HF CONDITIONS MAY BE EXPERIENCED FROM SECOND HALF OF 
UT DAY 18 JUNE AT HIGH LATITUDES. 

DEGRADATION FORECAST DUE TO ANTICIPATED GEOMAGNETIC ACTIVITY
FROM RECENT MASS EJECTION AND CORONAL HOLE WIND STREAM.

ALSO A WEAK PROTON EVENT IS POSSIBLE (INCREASED ABSORPTION 
AT POLAR REGIONS) FOLLOWING THE RECENT M7 FLARE AT 2254UT ON 17 JUNE 
(SLOW DECLINE SUGGESTS PROTON EVENT POSSIBLE).

FURTHER FLARES/SWFs EXPECTED FROM ACTIVE REGION 386 SOUTH-EAST 
SOLAR QUADRANT.

IF COMMS DIFFICULTIES EXPERIENCED TRY A LOWER FREQUENCY BAND
A MORE DETAILED HF WARNING WILL FOLLOW IF DEPRESSIONS EVENTUATE.
_____________________________________________________________



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