[Ips-hf-warning] SWS HF COMMS WARNING issued 0329 UT on 12 Dec 2016 [SEC=UNCLASSIFIED]

[rwc]

SUBJ: SWS HF RADIO COMMUNICATIONS WARNING 16/66
ISSUED AT 0328UT/12 DECEMBER 2016
BY THE AUSTRALIAN SPACE FORECAST CENTRE.

The Earth ionosphere is currently under the influence of moderately 
disturbed solar winds associated with a large southern hemisphere 
coronal hole. Although the coronal hole effects are waning, the 
ionospheric depression are expected to last for few more day. 
The depressions are expected to be stronger in the southern hemisphere 
compared to the northern hemisphere. HF users are advised to 
use lower than the monthly predicted frequencies for the next 
three days.

DEGRADED HF PROPAGATION CONDITIONS EXPECTED
FROM 12-14 DECEMBER 2016
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
_____________________________________________________________
12 Dec:   -5          -11%      2  4  6  8 12 16 16 22
13 Dec:    0   normal/-15%      2  4  6  8 12 12 16 22
14 Dec:    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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