[Ips-hf-warning] SWS HF COMMS WARNING issued 0101 UT on 18 Dec 2017 [SEC=UNCLASSIFIED]

[rwc]

SUBJ: SWS HF RADIO COMMUNICATIONS WARNING 17/54
ISSUED AT 0101UT/18 DECEMBER 2017
BY THE AUSTRALIAN SPACE FORECAST CENTRE.

Minor to moderate MUF depressions and degradations in HF conditions 
in high and mid latitude southern hemisphere regions are possible 
from 18 to 19 December. These depression are the aftermath of 
disturbed conditions associated with the equatorial coronal hole, 
and will be more prominent in the summer hemisphere.

DEGRADED HF PROPAGATION CONDITIONS EXPECTED
FROM 18-19 DECEMBER 2017
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
_____________________________________________________________
18 Dec:  -20          -10%      2  4  6  8 12 16 16 22
19 Dec:  -30          -14%      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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