[Ips-hf-warning] IPS HF COMMS WARNING

[rwc]

SUBJ: IPS HF RADIO COMMUNICATIONS WARNING 03/43
ISSUED AT 02/2250Z JUNE 2003
BY THE AUSTRALIAN SPACE FORECAST CENTRE.

THE EARTH HAS ENTERED A CORONAL HOLE HIGH SPEED
SOLAR WIND STREAM.

DEGRADED HF PROPAGATION CONDITIONS EXPECTED
FROM 03-05 JUNE 2003 FOR SOUTHERN AUS/NZ REGION
ONLY. NORTHERN AUS REGION MUFS EXPECTED TO REMAIN
NEAR MONTHLY PREDICTED VALUES, AND COMMUNICATORS
IN NORTHERN AUS REGION SHOULD USE A TINDEX OF 75.

IF COMMS DIFFICULTIES EXPERIENCED TRY A LOWER FREQUENCY BAND
_____________________________________________________________

SOLAR ACTIVITY FORECAST       HF COMMS FADEOUTS             
03 Jun:  Moderate             Probable             
04 Jun:  Moderate             Probable             
05 Jun:  Moderate             Probable             
Note: Active solar region on disk - flares expected.

HF COMMUNICATIONS FORECAST (SOUTHERN AUSTRALIAN/NEW ZEALAND REGION)
                                   FREQUENCY BANDS  
       T-index  MUFs          2  4  6  8 12 16 22 26
_____________________________________________________________
3 Jun   60    -15%           2  4  6  8 12 12 16 22 
4 Jun   45    -20%           2  4  6  8  8 12 16 16 
5 Jun   45    -20%           2  4  6  8  8 12 16 16 


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