[Ips-dhfpr] ASWFC Daily HF Prop Report - 18 October 25 issued 2332 UT on 18 Oct 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/18 OCTOBER 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (18 OCTOBER) 
Date   T index  Conditions    
18 Oct    99    Fair-normal    

Flares    Max     Fadeout    Freq.  Sectors
  M1.0    0041UT  possible   lower  West Pacific
  M1.1    0239UT  possible   lower  E. Asia/Aust.
  M1.2    0639UT  possible   lower  Mid East/Indian
  M1.5    1051UT  possible   lower  European

MUFs:
   Cocos Island Region:
      Enhanced by 30% during local day.
      Enhanced by 15% during local night.
   Niue Island Region:
      Enhanced by 15% during local day.
      Enhanced by 15% during local night.
   Northern Australian Region:
      Near predicted monthly values.
   Southern Australian Region:
      Depressed by 15% during local day.
      Near predicted monthly values during local night.
      Depressed by 35% after local dawn.
   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 (19 OCTOBER - 21 OCTOBER)
Date   T index  Conditions       MUFs                              
19 Oct    90    Fair             Near predicted monthly values/depressed 
                                 5 to 15%
20 Oct    94    Normal-fair      Near predicted monthly values    
21 Oct   100    Normal           Near predicted monthly values   

COMMENT: ASWFC SWF HF Communications Warning 95 was issued on 
18 October and is current for 18-19 Oct. Maximum usable frequencies 
(MUFs) in the Australian region on UT day 18-Oct were mostly 
near predicted monthly values in the northern Australian region 
and during local night in the southern Australian region. Conditions 
were depressed by 15-35% during local daylight hours in the southern 
Australian region. MUFs are expected to be near predicted monthly 
values to 15% depressed on 19-Oct and near predicted monthly 
values over 20-21 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