[Ips-dhfpr] ASWFC Daily HF Prop Report - 31 July 26 issued 2334 UT on 31 Jul 2026 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/31 JULY 2026
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (31 JULY) 
Date   T index  Conditions    
31 Jul    81    Normal-fair    

Flares: none.

MUFs:
   Cocos Island Region:
      No data available during local day.
      No data available during local night.
   Niue Island Region:
      Enhanced by 30% during local day.
      Near predicted monthly values during local night.
   Northern Australian Region:
      Near predicted monthly values.
   Southern Australian Region:
      Mostly near predicted monthly values.
      Enhanced by 20% after local dawn.
   Antarctic Region (Casey/Davis/Mawson):
      Near predicted monthly values over the UT day.

PCA Event : 10MeV Proton/PCA Event Began at 1835UT 30/07, Ended at 0115UT 31/07
 and, 10MeV Proton/PCA Event Began at 0310UT 31/07, Ended at 0425UT 31/07
 and, 10MeV Proton/PCA Event Began at 1350UT 31/07, Ended at 1735UT 31/07

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


2. FORECAST (01 AUGUST - 03 AUGUST)
Date   T index  Conditions       MUFs                              
01 Aug    80    Normal           Near to 15% above predicted 
                                 monthly values
02 Aug    55    Fair             Near predicted monthly values    
03 Aug    55    Normal           Near predicted monthly values   

COMMENT: Maximum Usable Frequencies (MUFs) in the Australian 
region on 31-Jul were near predicted monthly values, with enhancements 
of 20% observed in the southern Australian region. Sporadic E 
was observed at Canberra. Spread-F was observed at several Australian 
sites during local night hours. MUFs are forecast to be near 
predicted monthly values to 15% enhanced on 01-Aug. MUFs are 
expected to decline to near predicted monthly values over 02-03 
Aug, with depressions of 10-15% possible on these days due to 
forecast geomagnetic activity. Shortwave fadeouts are possible.

----------------------------------------------------------
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