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

[Australian Space Weather Forecasting Centre]

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

1. SUMMARY (20 JULY) 
Date   T index  Conditions    
20 Jul    67    Normal         

Flares    Max     Fadeout    Freq.  Sectors
  M2.5    1436UT  possible   lower  South American/
                                    Atlantic
  M1.1    1920UT  possible   lower  East Pacific/
                                    North American
  M3.4    2225UT  possible   lower  East Pacific/
                                    North American

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 15% during local night.
   Southern Australian Region:
      Mostly near predicted monthly values.
   Antarctic Region (Casey/Davis/Mawson):
      Near predicted monthly values over the UT day.

PCA Event : No event.

Monthly T index:
Month  T index
Jun      81
Jul      66
Aug      63


2. FORECAST (21 JULY - 23 JULY)
Date   T index  Conditions       MUFs                              
21 Jul    65    Normal           Near predicted monthly values
22 Jul    45    Fair             Depressed 15%/near predicted 
                                 monthly values    
23 Jul    55    Fair-normal      Depressed 10%/near predicted 
                                 monthly values   

COMMENT: Maximum Usable Frequencies (MUFs) in the Australian 
region on UT day 20-Jul were near predicted monthly values, with 
overnight depressions up to 15% observed in the northern Australian 
region. Spread-F was observed across the Australian region during 
local night hours, with strong spread-F observed in Hobart, Perth, 
Learmonth, and Townsville. Sporadic E was also observed in Learmonth 
during local night hours. MUFs are forecast to be near predicted 
monthly values on 21-Jul, with some depressions possible during 
local night hours. MUFs are forecast to be up to 15% depressed 
on 22-Jul due to anticipated geomagnetic activity, with depressions 
of up to 10% possible on 23-Jul as geomagnetic activity continues. 
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