[Ips-dhfpr] ASWFC Daily HF Prop Report - 27 September 25 issued 2330 UT on 27 Sep 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/27 SEPTEMBER 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (27 SEPTEMBER) 
Date   T index  Conditions    
27 Sep   130    Normal         

Flares    Max     Fadeout    Freq.  Sectors
  M1.0    0401UT  possible   lower  E. Asia/Aust.
  M1.1    0714UT  possible   lower  Mid East/Indian

MUFs:
   Cocos Island Region:
      Enhanced by 30% during local day.
      Enhanced by 30% during local night.
   Niue Island Region:
      Near predicted monthly values during local day.
      Enhanced by 20% during local night.
   Northern Australian Region:
      Near predicted monthly values during local day.
      Enhanced by 50% during local night.
   Southern Australian Region:
      Enhanced by 20% during local day.
      Enhanced by 25% during local night.
      Enhanced by 35% after local dawn.
   Antarctic Region (Casey/Davis/Mawson):
      Enhanced by 20% over the UT day.

PCA Event : No event.

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


2. FORECAST (28 SEPTEMBER - 30 SEPTEMBER)
Date   T index  Conditions       MUFs                              
28 Sep   120    Normal           Near to 20% above predicted 
                                 monthly values
29 Sep   120    Normal           Near to 20% above predicted 
                                 monthly values    
30 Sep   120    Normal           Near to 20% above predicted 
                                 monthly values   

COMMENT: ASWFC SWF HF Communications Warning 85 was issued on 
27 September and is current for 27-28 Sep. Maximum usable frequencies 
(MUFs) in the Australian region on UT day 27-Sep were near predicted 
values to 35 enhanced. Sporadic-E was observed on the eastern 
side of Australian and also in Cocos Islands during local night 
hours. Scintillation was observed in Niue from 0736 to 0813UT. 
MUFs are expected to be near predicted values to 20 enhanced 
over 28-30 Sep. Equatorial scintillation is 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