[Ips-dhfpr] ASWFC Daily HF Prop Report - 13 October 25 issued 2333 UT on 13 Oct 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/13 OCTOBER 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (13 OCTOBER) 
Date   T index  Conditions    
13 Oct    82    Fair-normal    

Flares    Max     Fadeout    Freq.  Sectors
  M1.9    0527UT  possible   lower  E. Asia/Aust.
  M2.7    0919UT  possible   lower  Mid East/Indian
  M1.3    1319UT  possible   lower  European

MUFs:
   Cocos Island Region:
      Near predicted monthly values.
   Niue Island Region:
      Enhanced by 20% during local day.
      Near predicted monthly values during local night.
   Northern Australian Region:
      Near predicted monthly values.
   Southern Australian Region:
      Near predicted monthly values.
      Perth depressed by 30% during the local day.
   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 (14 OCTOBER - 16 OCTOBER)
Date   T index  Conditions       MUFs                              
14 Oct    90    Normal           Near predicted monthly values
15 Oct    90    Normal-fair      Near predicted monthly values    
16 Oct    70    Fair             Depressed 10 to 15%/near predicted 
                                 monthly values   

COMMENT: ASWFC SWF HF Communications Warning 93 was issued on 
13 October and is current for 13-15 Oct. Maximum usable frequencies 
(MUFs) in the Australian region on UT day 13-Oct were generally 
near predicted monthly values. Perth MUFs were depressed 30% 
during the local day. Spread F was observed at Hobart and Perth 
during local night hours. MUFs at some northern Australian region 
sites were 15% depressed at times during the local day. MUFs 
are expected to be generally expected to be near predicted monthly 
values over 14-15 Oct, with mild 15% depressions possible at 
times. Southern Australian region MUFs may become 15% depressed 
over 16-17 Oct due to an anticipated increase in geomagnetic 
activity. 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