[Ips-dhfpr] SWS Daily HF Prop Report - 18 December 21 issued 2347 UT on 18 Dec 2021
rwc
rwc at ips.gov.au
Sun Dec 19 10:47:06 EST 2021
SUBJ: SWS DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/18 DECEMBER 2021 BY Space Weather Services
FROM THE AUSTRALIAN SPACE FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST
1. SUMMARY (18 DECEMBER)
Date T index Conditions
18 Dec 58 Normal
Flares: none.
MUFs:
Cocos Island Region:
Enhanced by 15% during local day.
Enhanced by 25% during local night.
Niue Island Region:
Enhanced by 20% during local day.
Near predicted monthly values during local night.
Northern Australian Region:
Near predicted monthly values during local day.
Enhanced by 20% during local night.
Southern Australian Region:
Near predicted monthly values.
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 (19 DECEMBER - 21 DECEMBER)
Date T index Conditions MUFs
19 Dec 45 Normal Near predicted monthly values
20 Dec 45 Normal Near predicted monthly values
21 Dec 25 Normal-fair Near predicted monthly values/depressed
10 to 30%
COMMENT: MUFs in the Australian region on 18 December ranged
from near predicted monthly values to slightly enhanced by 15-30%
for all regions apart from Southern AUS/NZ and Antarctic regions.
MUFs are expected to be mostly near predicted monthly values
with possible enhanced conditions for Equatorial to Southern
AUS/NZ regions for the next 24-48 hours. Depressed MUFs possible
for Southern AUS/NZ regions and disturbed ionospheric support
for Antarctic regions 21Dec due to expected increase in geomagnetic
activity. Chance of short-wave fadeouts 19Dec-21Dec.
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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
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