[Ips-dhfpr] SWS Daily HF Prop Report - 09 December 18 issued 2330 UT on 09 Dec 2018 [SEC=UNCLASSIFIED]
Regional Warning Centre
rwc at ips.gov.au
Mon Dec 10 10:30:20 EST 2018
SUBJ: SWS DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/09 DECEMBER 2018 BY Space Weather Services
FROM THE AUSTRALIAN SPACE FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST
1. SUMMARY (09 DECEMBER)
Date T index Conditions
09 Dec -46 Normal-fair
Flares: none.
MUFs:
Cocos Island Region:
No data available.
Niue Island Region:
Depressed by 15% during local day.
Depressed by 15% during local night.
Northern Australian Region:
Depressed by 15% during local day.
Depressed by 20% during local night.
Southern Australian Region:
Depressed by 15% during local day.
Depressed by 15% 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
Nov -32
Dec -8
Jan -9
2. FORECAST (10 DECEMBER - 12 DECEMBER)
Date T index Conditions MUFs
10 Dec -35 Normal-fair Depressed 20%/near predicted
monthly values
11 Dec -40 Normal-fair Depressed 25%/near predicted
monthly values
12 Dec -35 Normal-fair Depressed 20%/near predicted
monthly values
COMMENT: SWS HF Communications Warning 24 was issued on 9 December
and is current for 10 Dec only. On UT day 9 December, a combination
of very low levels of ionising radiation from the Sun and geomagnetic
disturbance associated with the coronal hole caused significant
MUF depressions across the Australian region as compared to the
monthly predicted levels. Sporadic E layers were seen across
the Australian region and in Antarctica. Depressions are expected
to continue on 10-12 December as a consequence of the continued
very low levels of ionising radiation from the Sun and recent
increase in geomagnetic activity.
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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
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