[Ips-hf-warning] IPS HF COMMS WARNING

[rwc]

SUBJ: IPS HF RADIO COMMUNICATIONS WARNING 02/47
ISSUED AT 11/2219Z SEPTEMBER 2002
BY THE AUSTRALIAN SPACE FORECAST CENTRE.

MILD GEOMAGNETIC ACTIVITY OBSERVED OVERNIGHT DUE TO
CORONAL HOLE. MUFS IN AUS/NZ REGION DEPRESSED 15% AFTER
LOCAL DAWN. 

DEGRADED HF PROPAGATION CONDITIONS EXPECTED
FOR 12 SEPTEMBER 2002, PARTICULARLY SOUTHERN REGION AUS/NZ.

EQUATORIAL (PNG) REGION MUFS ARE ENHANCED 15-20% AND 
COMMUNICATORS IN THIS REGION SHOULD USE A T OF 140.

NORTHERN AUS REGION MUFS WILL PROBABLY RECOVER AS DAY PROGRESSES.

IF COMMS DIFFICULTIES EXPERIENCED TRY A LOWER FREQUENCY BAND
-------------------------------------------------------------
SOLAR ACTIVITY FORECAST       HF COMMS FADEOUTS             
12 Sep:  moderate             Possible             

HF COMMUNICATIONS FORECAST (AUSTRALIAN/NEW ZEALAND REGION)
                                   FREQUENCY BANDS  
       T-index  MUFs          2  4  6  8 12 16 22 26
-------------------------------------------------------------
12 Sep   85    -15%           2  4  6  8 12 12 16 22 

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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