[Ips-dhfpr] ASWFC Daily HF Prop Report - 17 October 25 issued 2330 UT on 17 Oct 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/17 OCTOBER 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (17 OCTOBER) 
Date   T index  Conditions    
17 Oct   105    Normal         

Flares    Max     Fadeout    Freq.  Sectors
  M1.0 16/2319UT  possible   lower  West Pacific
  M1.5    0128UT  possible   lower  West Pacific
  M1.1    1245UT  possible   lower  European
  M1.0    1432UT  possible   lower  South American/
                                    Atlantic
  M1.3    1633UT  possible   lower  South American/
                                    Atlantic
  M1.1    1903UT  possible   lower  East Pacific/
                                    North American

MUFs:
   Cocos Island Region:
      Enhanced by 30% during local day.
      Near predicted monthly values during local night.
   Niue Island Region:
      Near predicted monthly values.
   Northern Australian Region:
      Near predicted monthly values during local day.
      Enhanced by 15% during local night.
   Southern Australian Region:
      Near predicted monthly values during local day.
      Enhanced by 20% 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
Sep      109
Oct      89
Nov      89


2. FORECAST (18 OCTOBER - 20 OCTOBER)
Date   T index  Conditions       MUFs                              
18 Oct   105    Normal-fair      Near to 15% above predicted 
                                 monthly values
19 Oct   100    Normal-fair      Near predicted monthly values    
20 Oct   100    Normal           Near predicted monthly values   

COMMENT: Maximum usable frequencies (MUFs) in the Australian 
region on UT day 17-Oct were near predicted monthly values to 
20% enhanced. MUFs are expected to be near predicted monthly 
values to 15% enhanced on 18-Oct and near predicted monthly values 
over 19-20 Oct. 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