[Ips-dhfpr] SWS Daily HF Prop Report - 15 December 18 issued 2330 UT on 15 Dec 2018 [SEC=UNCLASSIFIED]
Regional Warning Centre
rwc at ips.gov.au
Sun Dec 16 10:30:22 EST 2018
SUBJ: SWS DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/15 DECEMBER 2018 BY Space Weather Services
FROM THE AUSTRALIAN SPACE FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST
1. SUMMARY (15 DECEMBER)
Date T index Conditions
15 Dec -50 Normal
Cocos Island Region:
No data available during local day.
No data available during local night.
Niue Island Region:
Depressed by 25% during local day.
Depressed by 45% during local night.
Depressed by 20% after local dawn.
Northern Australian Region:
Near predicted monthly values during local day.
Depressed by 35% during local night.
Southern Australian Region:
Depressed by 20% during local day.
Depressed by 30% during local night.
Antarctic Region (Casey/Scott Base/Davis/Mawson):
Near predicted monthly values over the UT day.
PCA Event : No event.
Monthly T index:
Month T index
2. FORECAST (16 DECEMBER - 18 DECEMBER)
Date T index Conditions MUFs
16 Dec -40 Normal Depressed 15 to 35%/near predicted
17 Dec -30 Normal Depressed 15 to 30%/near predicted
18 Dec -30 Normal Depressed 15 to 30%/near predicted
COMMENT: SWS HF Communications Warning 27 was issued on 15 December
and is current for 16 Dec only. On UT day 15 December, there
were minor to moderate MUF depressions across the Australian
region as compared to the monthly predicted levels, with some
severe MUF depressions during the local night in the Niue Island,
Northern Australian, and Central Australian regions. Sporadic
E layers were seen across the Australian region and in Antarctica.
Similar conditions are expected for UT day, 16 December, as a
consequence of the continued very low levels of ionising radiation
from the Sun. Depressions may lessen on UT day, 17 December,
in response to possible geomagnetic activity due to an approaching
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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