[Ips-dhfpr] SWS Daily HF Prop Report - 20 December 18 issued 2330 UT on 20 Dec 2018 [SEC=UNCLASSIFIED]
Regional Warning Centre
rwc at ips.gov.au
Fri Dec 21 10:30:21 EST 2018
SUBJ: SWS DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/20 DECEMBER 2018 BY Space Weather Services
FROM THE AUSTRALIAN SPACE FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST
1. SUMMARY (20 DECEMBER)
Date T index Conditions
20 Dec -29 Normal
Niue Island Region:
Depressed by 20% during local day.
Near predicted monthly values during local night.
Depressed by 20% after local dawn.
Northern Australian Region:
Near predicted monthly values.
Southern Australian Region:
Depressed by 15% during local day.
Depressed by 15% during local night.
Antarctic Region (Casey/Scott Base/Davis/Mawson):
Depressed by 20% over the UT day.
PCA Event : No event.
Monthly T index:
Month T index
2. FORECAST (21 DECEMBER - 23 DECEMBER)
Date T index Conditions MUFs
21 Dec -20 Normal Near predicted monthly values/depressed
10 to 20%
22 Dec -20 Normal Near predicted monthly values/depressed
10 to 20%
23 Dec -20 Normal Near predicted monthly values/depressed
10 to 20%
COMMENT: SWS HF Communications Warning 30 was issued on 20 December
and is current for 21 Dec only. On UT day 20 December, there
were near predicted values to moderate MUF depressions across
the Australian region. Sporadic E layers were seen across the
Australian region and in Antarctica. Near predicted to moderate
depressions are expected for the next three days, as a consequence
of the continued very low levels of ionising radiation from the
For an explanation of some of the terms in this report, go to
http://www.sws.bom.gov.au, and follow links to Educational->
Glossary on Solar Terrestrial Terms.
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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