[Ips-hf-warning] SWS HF COMMS WARNING issued 2300 UT on 16 Feb 2017 [SEC=UNCLASSIFIED]

[rwc]

SUBJ: SWS HF RADIO COMMUNICATIONS WARNING 17/14
ISSUED AT 2300UT/16 FEBRUARY 2017
BY THE AUSTRALIAN SPACE FORECAST CENTRE.

The Earth's ionosphere is currently under the influence of moderately 
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 three days (17-19 February), 
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 (17-19 February).

DEGRADED HF PROPAGATION CONDITIONS EXPECTED
FROM 17-19 FEBRUARY 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
_____________________________________________________________
17 Feb:   -3          -11%      2  4  6  8 12 16 16 22
18 Feb:   -5          -12%      2  4  6  8 12 16 16 22
19 Feb:   -3          -11%      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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