[Ips-dhfpr] ASWFC Daily HF Prop Report - 18 December 24 issued 2330 UT on 18 Dec 2024 [SEC=OFFICIAL]
Australian Space Weather Forecasting Centre
aswfc at bom.gov.au
Thu Dec 19 10:30:49 AEDT 2024
SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/18 DECEMBER 2024
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST
1. SUMMARY (18 DECEMBER)
Date T index Conditions
18 Dec 63 Normal-fair
Flares: none.
MUFs:
Cocos Island Region:
Enhanced by 30% during local day.
Near predicted monthly values during local night.
Niue Island Region:
Near predicted monthly values during local day.
Depressed by 20% during local night.
Northern Australian Region:
Depressed by 30% during local day.
Depressed by 25% during local night.
Southern Australian Region:
Depressed by 30% during local day.
Depressed by 15% during local night.
Antarctic Region (Casey/Davis/Mawson):
Near predicted monthly values over the UT day.
PCA Event : No event.
Monthly T index:
Month T index
Nov 127
Dec 117
Jan 114
2. FORECAST (19 DECEMBER - 21 DECEMBER)
Date T index Conditions MUFs
19 Dec 95 Normal-fair Near predicted monthly values
to 10-15% depressed
20 Dec 100 Normal Near predicted monthly values
21 Dec 110 Normal Near predicted monthly values
to 10-15% enhanced
COMMENT: ASWFC SWF HF Communications Warning 145 was issued on
18 December and is current for 18-20 Dec. Maximum usable frequencies
(MUFs) in the Australian region on UT day 18-Dec were depressed
from 15-30%. Sporadic E was common during local night hours in
most sites. Conditions at Darwin were significantly degraded
during local night hours. MUFs are expected to be mildly degraded
on 19-Dec, but on a general improving trend to near predicted
monthly values over 20-21 Dec.
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For an explanation of some of the terms in this report, go to
https://www.sws.bom.gov.au, and follow links to Educational->
Glossary on Solar Terrestrial Terms.
Australian Space Weather Forecasting Centre
Bureau of Meteorology
ASWFC at bom.gov.au
www.bom.gov.au | www.sws.bom.gov.au
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