[Ips-hf-warning] IPS HF COMMS WARNING

rwc rwc at ips.gov.au
Thu Nov 18 13:56:30 EST 2004


SUBJ: IPS HF RADIO COMMUNICATIONS WARNING 04/51
ISSUED AT 18/0253Z NOVEMBER 2004
BY THE AUSTRALIAN SPACE FORECAST CENTRE.

NORTHERN AUS REGION MUFS ARE NEAR NORMAL. SOUTHERN AUS/NZ
REGION MUFS HAVE BEEN UNEXPECTEDLY DEPRESSED SINCE DAWN.
THE CAUSE OF THIS DEPRESSION IN UNCLEAR.

DEGRADED HF PROPAGATION CONDITIONS NOW EXPECTED
TO CONTINUE FOR REMAINDER OF 18 NOVEMBER 2004
SOUTHERN AUS/NZ REGION ONLY.
IF COMMS DIFFICULTIES EXPERIENCED TRY A LOWER FREQUENCY BAND
_____________________________________________________________

SOLAR ACTIVITY FORECAST       HF COMMS FADEOUTS             
18 Nov:  low to moderate      Possible             

HF COMMUNICATIONS FORECAST (SOUTHERN AUSTRALIAN/NEW ZEALAND REGION)
                                   FREQUENCY BANDS  
       T-index  MUFs          2  4  6  8 12 16 22 26
_____________________________________________________________
18 Nov   -5    -15-20%        2  4  6  8 12 12 16 22 


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