[Ips-hf-warning] SWS HF COMMS WARNING issued 2338 UT on 29 Nov 2018 [SEC=UNCLASSIFIED]

[rwc]

SUBJ: SWS HF RADIO COMMUNICATIONS WARNING 18/19
ISSUED AT 2337UT/29 NOVEMBER 2018
BY THE AUSTRALIAN SPACE FORECAST CENTRE.

MUF depressions of 10% to 30% may be observed on UT day 30 November 
due to the continued very low levels of ionising radiation from 
the Sun. Further MUF depressions up to around 40% are likely 
on UT days 1 and 2 December due to expected rise in geomagnetic 
activity levels on these days and due to the continued very low 
levels of ionising radiation from the Sun.

DEGRADED HF PROPAGATION CONDITIONS EXPECTED
FROM 30 NOVEMBER 2018 TO 02 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
_____________________________________________________________
30 Nov:  -30   normal/-30%      2  4  6  6  8 12 16 16
01 Dec:  -35          -40%      2  4  4  4  8  8 12 12
02 Dec:  -35          -40%      2  4  4  4  8  8 12 12

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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