[Ips-dhfpr] ASWFC Daily HF Prop Report - 19 August 26 issued 2330 UT on 19 Aug 2026 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/19 AUGUST 2026
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (19 AUGUST) 
Date   T index  Conditions    
19 Aug    71    Normal         

Flares    Max     Fadeout    Freq.  Sectors
  M1.0    1851UT  possible   lower  E. Asia/Aust.

MUFs:
   Cocos Island Region:
      No data available during local day.
      No data available during local night.
   Niue Island Region:
      Near predicted monthly values.
   Northern Australian Region:
      Near predicted monthly values during local day.
      Depressed by 20% during local night.
   Southern Australian Region:
      Near predicted monthly values.
   Antarctic Region (Casey/Davis/Mawson):
      Depressed by 15% over the UT day.

PCA Event : No event.

Monthly T index:
Month  T index
Jul      75
Aug      64
Sep      61


2. FORECAST (20 AUGUST - 22 AUGUST)
Date   T index  Conditions       MUFs                              
20 Aug    70    Normal-fair      Near predicted monthly values
21 Aug    70    Normal           Near predicted monthly values    
22 Aug    70    Normal           Near predicted monthly values   

COMMENT: ASWFC SWF HF Communications Warning 73 was issued on 
19 August and is current for 20-22 Aug. Maximum usable frequencies 
(MUFs) in the Australian region on UT day 19-Aug were near predicted 
monthly values to 20% depressed. Depressions were observed during 
local night hours in northern Australian regions. Spread F was 
observed at Hobart and Learmonth during local night hours. MUFs 
are expected to be near predicted monthly values over 20-22 Aug. 
Shortwave fadeouts are possible.

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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