[Ips-hf-warning] IPS HF COMMS WARNING

[rwc]

SUBJ: IPS HF RADIO COMMUNICATIONS WARNING 03/35
ISSUED AT 09/2228Z MAY 2003
BY THE AUSTRALIAN SPACE FORECAST CENTRE.

OVERNIGHT GEOMAGNETIC ACTIVITY STRONGER THAN
EXPECTED DUE TO UNEXPECTED SHOCK IN SOLAR WIND.

DEGRADED HF PROPAGATION CONDITIONS NOW EXPECTED
FOR 10 MAY 2003 SOUTHERN AUS/NZ REGION ONLY.
CONDITIONS ARE EXPECTED TO IMPROVE AS DAY PROGRESSES.

NORTHERN AUS REGION MUFS APPEAR MOSTLY UNAFFECTED 
FOLLOWING LOCAL DAWN THIS MORNING. COMMUNICATORS
IN NORTHERN AUS REGION SHOULD USE A TINDEX OF 70.

IF COMMS DIFFICULTIES EXPERIENCED TRY A LOWER FREQUENCY BAND
FOLLOW ON HF WARNING FROM HF WARNING: 34
_____________________________________________________________

SOLAR ACTIVITY FORECAST       HF COMMS FADEOUTS             
10 May:  low                  None expected        

HF COMMUNICATIONS FORECAST (SOUTHERN AUSTRALIAN/NEW ZEALAND REGION)
                                   FREQUENCY BANDS  
       T-index  MUFs          2  4  6  8 12 16 22 26
_____________________________________________________________
10 May   35    -20%           2  4  6  8  8 12 16 16 


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