[Ips-hf-warning] SWS HF COMMS WARNING issued 2255 UT on 26 Dec 2018 [SEC=UNCLASSIFIED]

[rwc]

SUBJ: SWS HF RADIO COMMUNICATIONS WARNING 18/31
ISSUED AT 2255UT/26 DECEMBER 2018
BY THE AUSTRALIAN SPACE FORECAST CENTRE.

MUF depressions are expected for the the next three days due 
to lower than predicted levels of ionising radiation from the 
Sun. High-frequency radio communication users are advised to 
use lower than the predicted monthly frequencies.

DEGRADED HF PROPAGATION CONDITIONS EXPECTED
FROM 27-29 DECEMBER 2018
IF COMMS DIFFICULTIES EXPERIENCED TRY A LOWER FREQUENCY BAND
_____________________________________________________________

HF COMMUNICATIONS FORECAST (AUSTRALIAN/NEW ZEALAND REGION)
                                   FREQUENCY BANDS
       T-index      MUFs        2  4  6  8 12 16 22 26
_____________________________________________________________
27 Dec:  -40          -14%      2  4  6  8 12 12 16 22
28 Dec:  -40          -14%      2  4  6  8 12 12 16 22
29 Dec:  -30          -10%      2  4  6  8 12 16 16 22

Space Weather Services              email: asfc at bom.gov.au
Bureau of Meteorology
PO Box 1386                         WWW: http://www.sws.bom.gov.au
Haymarket NSW 1240  AUSTRALIA       FTP: ftp://ftp-out.sws.bom.gov.au
tel: +61 2 9213 8010                fax: +61 2 9213 8060 

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