[Ips-hf-warning] IPS HF COMMS WARNING

[rwc]

SUBJ: IPS HF RADIO COMMUNICATIONS WARNING 03/53
ISSUED AT 17/0403Z JULY 2003
BY THE AUSTRALIAN SPACE FORECAST CENTRE.

Depressions of 15 to 30% are being observed 
in some of the Southern Australian/NZ sites
so far today (UT Day) due to coronal hole 
high speed solar wind stream effects. 
Lower than normal MUFs may be observed in 
these regions for the rest of the day today and
Australian region MUFs have remained near normal.

DEGRADED HF PROPAGATION CONDITIONS EXPECTED
FROM 17-18 JULY 2003
IF COMMS DIFFICULTIES EXPERIENCED TRY A LOWER FREQUENCY BAND
_____________________________________________________________

SOLAR ACTIVITY FORECAST       HF COMMS FADEOUTS             
17 Jul:  Low                  Possible             
18 Jul:  Low                  Possible             

HF COMMUNICATIONS FORECAST (SOUTHERN AUSTRALIAN/NEW ZEALAND REGION)
                                   FREQUENCY BANDS  
       T-index  MUFs          2  4  6  8 12 16 22 26
_____________________________________________________________
17 Jul    30     -15%         2  4  6  8 12 12 16 22 
18 Jul    30     -15%         2  4  6  8 12 12 16 22 


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