[Ips-hf-warning] IPS HF COMMS WARNING

[rwc]

SUBJ: IPS HF RADIO COMMUNICATIONS WARNING 02/63
ISSUED AT 02/2242Z NOVEMBER 2002
BY THE AUSTRALIAN SPACE FORECAST CENTRE.

MUFS AFTER LOCAL DAWN SOUTH OF CANBERRA AND
IN NEW ZEALAND ARE DEPRESSED 20% FOLLOWING WEAK 
OVERNIGHT GEOMAGNETIC ACTIVITY. MUFS NORTH OF
SYDNEY ARE CURRENTLY ENHANCED BY UP TO 25% AND
COMMUNICATORS IN THIS REGION SHOULD USE A T OF 130
TO 150.

IN GENERAL CORONAL HOLE INDUCED GEOMAGNETIC ACTIVITY IS 
EXPECTED TO CAUSE A SEPRATION IN MUF SUPPORT LEVELS 
OVER THE NEXT FEW DAYS, WITH DEPRESSED CONDITIONS LIKELY AFTER 
LOCAL DAWN FOR SOUTHERN AUS/NZ REGION, AND THE LIKELYHOOD 
OF CONTINUED ENHANCED CONDITIONS IN NORTHERN AUS/NZ REGION.

DEGRADED HF PROPAGATION CONDITIONS EXPECTED
FROM 03 NOVEMBER 2002 SOUTHERN AUS/NZ REGION ONLY.

IF COMMS DIFFICULTIES EXPERIENCED TRY A LOWER FREQUENCY BAND
-------------------------------------------------------------
SOLAR ACTIVITY FORECAST       HF COMMS FADEOUTS             
03 Nov:  low to moderate      Possible             

HF COMMUNICATIONS FORECAST (SOUTHERN AUSTRALIAN/NEW ZEALAND REGION)
                                   FREQUENCY BANDS  
       T-index  MUFs          2  4  6  8 12 16 22 26
-------------------------------------------------------------
3 Nov   70    -20%            2  4  6  8  8 12 16 16 

IPS Radio and Space Services      | email: asfc at ips.gov.au
PO Box 1386                       | WWW: http://www.ips.gov.au
Haymarket NSW 1240  AUSTRALIA     | FTP: ftp://ftp.ips.gov.au 
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