[Ips-hf-warning] IPS HF COMMS WARNING

[rwc]

SUBJ: IPS HF RADIO COMMUNICATIONS WARNING 03/40
ISSUED AT 29/2342Z MAY 2003
BY THE AUSTRALIAN SPACE FORECAST CENTRE.

IONOSPHERIC DEPRESSION OBSERVED AFTER LOCAL DAWN SOUTHERN
AUS/NZ REGION. NORTHERN AUS REGION MUFS CURRENLTY NEAR
NORMAL. NORTHERN REGION AUS COMMUNICATORS SHOULD USE A TINDEX
OF 70.

DEPRESSED AND DEGRADED HF PROPAGATION CONDITIONS EXPECTED
FOR FIRST HALF 30 MAY 2003 SOUTHERN AUS/NZ REGION.

IF COMMS DIFFICULTIES EXPERIENCED TRY A LOWER FREQUENCY BAND
FOLLOW ON HF WARNING FROM HF WARNING: 39
_____________________________________________________________

SOLAR ACTIVITY FORECAST       HF COMMS FADEOUTS             
30 May:  moderate to high     Probable             

HF COMMUNICATIONS FORECAST (SOUTHERN AUSTRALIAN/NEW ZEALAND REGION)
SOUTHERN AUS/NZ EGION              FREQUENCY BANDS  
       T-index  MUFs          2  4  6  8 12 16 22 26
_____________________________________________________________
30 May   30    -20%           2  4  6  8  8 12 16 16 


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