[Ips-hf-warning] SWS HF COMMS WARNING issued 2243 UT on 20 Dec 2018 [SEC=UNCLASSIFIED]

[rwc]

SUBJ: SWS HF RADIO COMMUNICATIONS WARNING 18/30
ISSUED AT 2242UT/20 DECEMBER 2018
BY THE AUSTRALIAN SPACE FORECAST CENTRE.

MUF depressions of 10% to 20% are expected today due to lower 
than predicted levels of ionising radiation from the Sun.

DEGRADED HF PROPAGATION CONDITIONS EXPECTED
FOR 21 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
_____________________________________________________________
21 Dec:  -20  normal/-(10-20)%  2  4  6  8 12 12 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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