[Ips-dhfpr] ASWFC Daily HF Prop Report - 20 August 26 issued 2330 UT on 20 Aug 2026 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/20 AUGUST 2026
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (20 AUGUST) 
Date   T index  Conditions    
20 Aug    73    Normal         

Flares    Max     Fadeout    Freq.  Sectors
  M1.8    0805UT  possible   lower  Mid East/Indian
  M8.1    1142UT  probable   lower  European
  M2.9    1611UT  possible   lower  South American/
                                    Atlantic

MUFs:
   Cocos Island Region:
      No data available during local day.
      No data available during local night.
   Niue Island Region:
      Mostly near predicted monthly values.
   Northern Australian Region:
      Near predicted monthly values.
   Southern Australian Region:
      Mostly 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 (21 AUGUST - 23 AUGUST)
Date   T index  Conditions       MUFs                              
21 Aug    75    Normal           Near predicted monthly values
22 Aug    75    Normal           Near predicted monthly values    
23 Aug    75    Normal           Near predicted monthly values   

COMMENT: ASWFC SWF HF Communications Warning 75 was issued on 
20 August and is current for 20-22 Aug. Maximum usable frequencies 
(MUFs) in the Australian region on UT day 20-Aug were near predicted 
monthly values. Spread F was observed at Hobart and Perth during 
local night hours. MUFs are expected to be near predicted monthly 
values over 21-23 Aug. Shortwave fadeouts are probable.

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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