[Ips-hf-warning] IPS HF COMMS WARNING

[rwc]

SUBJ: IPS HF RADIO COMMUNICATIONS WARNING 02/74
ISSUED AT 26/0003Z NOVEMBER 2002
BY THE AUSTRALIAN SPACE FORECAST CENTRE.

DEGRADED HF PROPAGATION CONDITIONS EXPECTED
FOR 26-27 NOVEMBER 2002.


26 NOV:
SOUTHERN AUS/NZ MUFS WERE AGAIN DEPRESSED AFTER
LOCAL DAWN THIS MORNING. NORTHERN AUS REGION MUFS 
ARE NEAR NORMAL, AND NORTHERN REGION COMMUNICATORS
SHOULD USE A T OF 100. 

27 NOV: 
DEPRESSED MUFS ARE EXPECTED IN GENERAL FOLLOWING
ANTICIPATED GEOMAGNETIC ACTIVITY FROM SOLAR FILAMENT
ERUPTION LATE ON 24 Nov.


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

HF COMMUNICATIONS FORECAST (AUSTRALIAN/NEW ZEALAND REGION)
                                   FREQUENCY BANDS  
       T-index  MUFs          2  4  6  8 12 16 22 26
-------------------------------------------------------------
26 Nov   50    -15%           2  4  6  8 12 12 16 22 (southern Aus/NZ)
26 Nov  100      0%           2  4  6  8 12 16 22 26 (northern Aus)
27 Nov   60    -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 
tel: +61 2 9213 8010              | fax: +61 2 9213 8060