[Ips-dhfpr] ASWFC Daily HF Prop Report - 21 July 26 issued 2330 UT on 21 Jul 2026 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/21 JULY 2026
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (21 JULY) 
Date   T index  Conditions    
21 Jul    76    Normal         

Flares    Max     Fadeout    Freq.  Sectors
  M3.4 20/2225UT  possible   lower  East Pacific/
                                    North American
  M1.9    1727UT  possible   lower  South American/
                                    Atlantic

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.
   Southern Australian Region:
      Near predicted monthly values during local day.
      Enhanced by 25% during local night.
   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 (22 JULY - 24 JULY)
Date   T index  Conditions       MUFs                              
22 Jul    50    Fair             Depressed 15%/near predicted 
                                 monthly values
23 Jul    50    Fair             Depressed 15%/near predicted 
                                 monthly values    
24 Jul    65    Normal-fair      Near predicted monthly values   

COMMENT: ASWFC SWF HF Communications Warning 66 was issued on 
21 July and is current for 21-22 Jul. Maximum Usable Frequencies 
(MUFs) in the Australian region were near predicted values on 
21-Jul, with some enhancements of up to 25% observed in the southern 
Australian region during local night hours. Sporadic E was observed 
in the northern Australian region, Norfolk Island, and Niue Island 
during local night hours. MUFs are forecast to become depressed 
by up to 15% over 22-23 Jul due to expected geomagnetic activity 
over this period, before recovering to near predicted values 
on 24-Jul. 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