SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/20 SEPTEMBER 2022
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST
1. SUMMARY (20 SEPTEMBER)
Date T index Conditions
20 Sep 74 Normal
Flares Max Fadeout Freq. Sectors
M1.1 1122UT possible lower European
MUFs:
Cocos Island Region:
Near predicted monthly values during local day.
Enhanced by 40% 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 15% 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
Aug 53
Sep 68
Oct 69
2. FORECAST (21 SEPTEMBER - 23 SEPTEMBER)
Date T index Conditions MUFs
21 Sep 70 Normal Near predicted monthly values
22 Sep 60 Normal-fair Near predicted monthly values
23 Sep 60 Normal-fair Near predicted monthly values
COMMENT: Maximum usable frequencies (MUFs) on UT day 20-Sep were
near predicted monthly values for mainland Australia, with enhancements
of 15-40% at Cocos Island and Niue. Strong spread F was observed
20/1500-1550UT at Cocos Island. Regional MUFs are expected to
be near predicted monthly values to 15% enhanced for 21-Sep,
with mild depressions/degradations possible for southern Australian
region during local night 22-23 Sep and briefly after local dawn
due to coronal hole high speed wind stream effects.
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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