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

[Australian Space Weather Forecasting Centre]

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

1. SUMMARY (19 SEPTEMBER) 
Date   T index  Conditions    
19 Sep    96    Fair-normal    

Flares    Max     Fadeout    Freq.  Sectors
  M1.5    2141UT  possible   lower  East Pacific/
                                    North American

MUFs:
   Cocos Island Region:
      No data available.
   Niue Island Region:
      Near predicted monthly values during local day.
      Enhanced by 25% during local night.
   Northern Australian Region:
      Near predicted monthly values.
   Southern Australian Region:
      Mostly near predicted monthly values.
   Antarctic Region (Casey/Davis/Mawson):
      Enhanced by 15% over the UT day.

PCA Event : No event.

Monthly T index:
Month  T index
Aug      96
Sep      92
Oct      90


2. FORECAST (20 SEPTEMBER - 22 SEPTEMBER)
Date   T index  Conditions       MUFs                              
20 Sep    95    Normal           Near predicted monthly values
21 Sep    95    Normal           Near predicted monthly values    
22 Sep    95    Normal-fair      Near predicted monthly values   

COMMENT: Maximum usable frequencies (MUFs) in the Australian 
region on UT day 19-Sep were mostly near predicted values to 
25% enhanced. Spread-F was observed at Hobart during local night 
hours. MUFs are expected to be near predicted values over 20-22 
Sep. Mildly degraded HF conditions may be experienced during 
local night hours for the southern Australian region during 22-23 
Sep, due to an anticipated mild increase in geomagnetic activity 
from a coronal hole wind stream. Isolated minor 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