[Ips-hf-warning] IPS HF COMMS WARNING

[rwc]

SUBJ: IPS HF RADIO COMMUNICATIONS WARNING 02/31
ISSUED AT 19/2316Z JULY 2002
BY THE AUSTRALIAN SPACE FORECAST CENTRE.

DEGRADED HF PROPAGATION CONDITIONS EXPECTED
FROM 20-21 JULY 2002 SOUTHERN AUS/NZ REGION
PARTICULARLY DURING LOCAL NIGHT HOURS AND AFTER 
LOCAL DAWN.

DEPRESSION RESPONSE FOR SOUTHERN HEMISPHERE EXPECTED TO BE REDUCED
DUE TO SEASONAL FACTORS. NORTHERN HEMISPHERE RESPONSE EXPECTED 
TO BE STRONGER.

IF COMMS DIFFICULTIES EXPERIENCED TRY A LOWER FREQUENCY BAND
FOLLOW ON HF WARNING FROM HF WARNING: 30
-------------------------------------------------------------
SOLAR ACTIVITY FORECAST       HF COMMS FADEOUTS             
20 Jul:  moderate to high     Probable             
21 Jul:  moderate to high     Probable             

HF COMMUNICATIONS FORECAST (AUSTRALIAN/NEW ZEALAND REGION)
                                   FREQUENCY BANDS  
       T-index  MUFs          2  4  6  8 12 16 22 26
-------------------------------------------------------------
20 Jul   90    -15%/normal    2  4  6  8 12 12 16 22 
21 Jul   95    normal/-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/asfc
Haymarket NSW 1240  AUSTRALIA     | FTP: ftp://ftp.ips.gov.au/users/asfc/ 
tel: +61 2 9213 8010              | fax: +61 2 9213 8060