[Ips-dhfpr] ASWFC Daily HF Prop Report - 27 July 26 issued 2330 UT on 27 Jul 2026 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/27 JULY 2026
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (27 JULY) 
Date   T index  Conditions    
27 Jul    77    Normal         

Flares    Max     Fadeout    Freq.  Sectors
  M1.0    0243UT  possible   lower  E. Asia/Aust.

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

PCA Event : No event.

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


2. FORECAST (28 JULY - 30 JULY)
Date   T index  Conditions       MUFs                              
28 Jul    70    Normal           Near predicted monthly values
29 Jul    70    Normal           Near predicted monthly values    
30 Jul    70    Normal           Near predicted monthly values   

COMMENT: ASWFC SWF HF Communications Warning 69 was issued on 
27 July and is current for 27-28 Jul. Maximum Usable Frequencies 
(MUFs) in the Australian region were mostly near predicted monthly 
values on UT day 27-Jul, with 15% depressions observed in the 
northern Australian region during local night hours. Spread-F 
was observed at Learmonth and Hobart during local night hours. 
MUFs are expected to be near predicted monthly values over 28-30 
Jul. Isolated minor 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