[Ips-dhfpr] SWS Daily HF Prop Report - 20 December 21 issued 2344 UT on 20 Dec 2021
rwc
rwc at ips.gov.au
Tue Dec 21 10:44:39 EST 2021
SUBJ: SWS DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/20 DECEMBER 2021 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 33 Normal-fair
Flares Max Fadeout Freq. Sectors
M1.8 1139UT possible lower European
MUFs:
Cocos Island Region:
Mostly near predicted monthly values.
Enhanced by 25% after local dawn.
Niue Island Region:
Near predicted monthly values during local day.
Enhanced by 25% during local night.
Northern Australian Region:
Near predicted monthly values.
Southern Australian Region:
Depressed by 25% during local day.
Near predicted monthly values 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 3
Dec 33
Jan 36
2. FORECAST (21 DECEMBER - 23 DECEMBER)
Date T index Conditions MUFs
21 Dec 30 Normal-fair Near predicted monthly values/depressed
10 to 30%
22 Dec 20 Normal Near predicted monthly values/depressed
10 to 30%
23 Dec 25 Normal Near predicted monthly values/depressed
10 to 30%
COMMENT: SWS HF Communications Warning 41 was issued on 20 December
and is current for 20-22 Dec. MUFs in the Australian region for
20Dec ranged from near predicted monthly values to slightly enhanced
by 15-30% for Equatorial and Northern AUS regions. Notable depressed
periods for Southern AUS/NZ regions and disturbed ionospheric
support for Antarctic regions. MUFs are expected to be mostly
near predicted monthly values for Equatorial and Northern AUS
regions with anticipated depressions of 10%-30% for Southern
AUS/NZ regions and disturbed conditions for Antarctic regions
for the next 3 due to expected increase in geomagnetic activity
over this period. Chance of short-wave fadeouts 21Dec-22Dec.
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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.
Space Weather Services email: asfc at bom.gov.au
Bureau of Meteorology
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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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