[Ips-hf-warning] IPS HF COMMS WARNING

[Regional Warning Centre]

SUBJ: IPS HF RADIO COMMUNICATIONS WARNING 00/77
ISSUED AT 11/0038Z NOVEMBER 2000
BY THE AUSTRALIAN SPACE FORECAST CENTRE.

DEGRADED HF PROPAGATION CONDITIONS EXPECTED
FROM 11-13 NOVEMBER 2000
IF COMMS DIFFICULTIES EXPERIENCED TRY A LOWER FREQUENCY BAND
FOLLOW ON HF WARNING FROM HF WARNING: 76
-------------------------------------------------------------
SOLAR ACTIVITY FORECAST       HF COMMS FADEOUTS             
11 Nov:  Low to moderate      Possible             
12 Nov:  Low to moderate      Possible
13 Nov:  Low to moderate      Possible

Depressions of 15-30% have been observed for southern Australian
regions following the impact of a CME on the Earth. Depressions
of 15-30% are expected at times over the next couple of days when
the Earth should be under the influence of a coronal hole.


HF COMMUNICATIONS FORECAST (AUSTRALIAN/NEW ZEALAND REGION)
                                   FREQUENCY BANDS  
       T-index  MUFs          2  4  6  8 12 16 22 26
-------------------------------------------------------------
11 Nov   110   -20%/normal    2  4  6  8  8 12 16 16 
12 Nov   115   -20%/normal    2  4  6  8  8 12 16 16 
13 Nov   120   -20%/normal    2  4  6  8  8 12 16 16 


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