[Ips-dhfpr] ASWFC Daily HF Prop Report - 19 April 25 issued 2330 UT on 19 Apr 2025 [SEC=OFFICIAL]
Australian Space Weather Forecasting Centre
aswfc at bom.gov.au
Sun Apr 20 09:30:44 AEST 2025
SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/19 APRIL 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST
1. SUMMARY (19 APRIL)
Date T index Conditions
19 Apr 121 Fair-normal
Flares Max Fadeout Freq. Sectors
M4.4 18/2350UT possible lower West Pacific
MUFs:
Cocos Island Region:
Enhanced by 40% during local day.
Enhanced by 25% during local night.
Niue Island Region:
Near predicted monthly values during local day.
Depressed by 25% during local night.
Enhanced by 20% after local dawn.
Northern Australian Region:
Mostly near predicted monthly values.
Enhanced by 20% after local dawn.
Southern Australian Region:
Near predicted monthly values.
Hobart 15-25% depressed after local dawn.
Antarctic Region (Casey/Davis/Mawson):
Depressed by 15% over the UT day.
PCA Event : No event.
Monthly T index:
Month T index
Mar 126
Apr 115
May 113
2. FORECAST (20 APRIL - 22 APRIL)
Date T index Conditions MUFs
20 Apr 120 Normal Near predicted monthly values
21 Apr 120 Normal-fair Near predicted monthly values
22 Apr 100 Normal-fair 10 to 15% below predicted monthly
values
COMMENT: Maximum usable frequencies (MUFs) in the Australian
region on UT day 19-Apr were generally near predicted monthly
values. Spread F was observed during local night hours at Hobart.
MUFs at Hobart were depressed 15-25% after local dawn and northern
region MUFs were 15% enhanced after local dawn this morning.
MUFs are generally expected to be near predicted monthly values over
20-22 Apr. Hobart MUFs are expected to gradually recover. Southern
Australian region HF conditions may become degraded from 22-Apr.
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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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