[Ips-dhfpr] ASWFC Daily HF Prop Report - 19 October 25 issued 2330 UT on 19 Oct 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/19 OCTOBER 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (19 OCTOBER) 
Date   T index  Conditions    
19 Oct    67    Normal-fair    

Flares    Max     Fadeout    Freq.  Sectors
  M1.0    0156UT  possible   lower  West Pacific
  M1.8    2015UT  possible   lower  East Pacific/
                                    North American

MUFs:
   Cocos Island Region:
      Near predicted monthly values.
   Niue Island Region:
      Enhanced by 15% during local day.
      Depressed by 20% during local night.
   Northern Australian Region:
      Depressed by 20% during local day.
      Near predicted monthly values during local night.
   Southern Australian Region:
      Depressed by 30% during local day.
      Near predicted monthly values during local night.
   Antarctic Region (Casey/Davis/Mawson):
      Depressed by 15% over the UT day.

PCA Event : No event.

Monthly T index:
Month  T index
Sep      109
Oct      89
Nov      89


2. FORECAST (20 OCTOBER - 22 OCTOBER)
Date   T index  Conditions       MUFs                              
20 Oct    87    Normal           Near predicted monthly values
21 Oct    90    Normal           Near predicted monthly values    
22 Oct    90    Normal           Near predicted monthly values   

COMMENT: ASWFC HF Communications Warning 96 was issued on 19 
October and is current for 19-20 Oct. Maximum usable frequencies 
(MUFs) in the Australian region on UT day 19-Oct were depressed 
by 20% in the northern Australian region and 30% in the southern 
Australian region during local daylight hours. Conditions recovered 
towards monthly predicted values during local night hours. Mild 
spread F was observed at Hobart during local night hours. MUFs 
are expected to be near predicted monthly values over 20-22 Oct. 
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