[Ips-hf-warning] SWS HF COMMS WARNING issued 2340 UT on 31 Dec 2016 [SEC=UNCLASSIFIED]

[rwc]

SUBJ: SWS HF RADIO COMMUNICATIONS WARNING 16/71
ISSUED AT 2339UT/31 DECEMBER 2016
BY THE AUSTRALIAN SPACE FORECAST CENTRE.

The Earth's ionosphere is currently under the influence of disturbed 
solar winds associated with a positive polarity coronal hole. 
The HF depressions are currently been experienced in the high 
latitude regions. Over the next two days (1-2 January), the high 
latitude depressions are expected to extend into the low latitude 
regions. This effect is expected to be more prominent in the 
Southern hemisphere during this time of the year. HF users are 
advised to use lower than the monthly predicted frequencies for 
the next three days (1-3 January).

DEGRADED HF PROPAGATION CONDITIONS EXPECTED
FROM 01-03 JANUARY 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
_____________________________________________________________
01 Jan:    0          -10%      2  4  6  8 12 16 16 22
02 Jan:   -5          -12%      2  4  6  8 12 16 16 22
03 Jan:    2   normal/-15%      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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