[Ips-hf-warning] IPS HF COMMS WARNING

[rwc]

SUBJ: IPS HF RADIO COMMUNICATIONS WARNING 03/68
ISSUED AT 14/2247Z OCTOBER 2003
BY THE AUSTRALIAN SPACE FORECAST CENTRE.

SOUTHERN AUS/NZ REGION MUFs DEPRESSED AFTER LOCAL
DAWN THIS MORNING FOLLOWING OVERNIGHT GEOMAGNETIC
ACTIVITY INDUCED BY CORONAL HOLE WIND STREAM. NORTHERN
AUS REGION MUFs ARE EXPECTED TO REMAIN MOSTLY NEAR
PREDICTED MONTHLY VALUES.

DUE TO BROAD EXTENT OF THIS CORONAL HOLE, INDUCED 
GEOMAGNETIC ACTIVITY MAY KEEP SOUTHERN AUS/NZ 
REGION MUFS LOWER THAN NORMAL UNTIL AROUND 18 OCT,
PARTICULARLY AFTER LOCAL DAWN.

DEPRESSED AND DEGRADED HF PROPAGATION CONDITIONS EXPECTED
FROM 15 OCTOBER 2003 SOUTHERN AUS/NZ REGION ONLY.

IF COMMS DIFFICULTIES EXPERIENCED TRY A LOWER FREQUENCY BAND
FOLLOW ON HF WARNING FROM HF WARNING: 67
_____________________________________________________________

SOLAR ACTIVITY FORECAST       HF COMMS FADEOUTS             
15 Oct:  low                  None expected        

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


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