[Ips-dhfpr] ASWFC Daily HF Prop Report - 30 September 25 issued 2330 UT on 30 Sep 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/30 SEPTEMBER 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (30 SEPTEMBER) 
Date   T index  Conditions    
30 Sep    88    Poor-fair      

Flares    Max     Fadeout    Freq.  Sectors
  M1.2    0056UT  possible   lower  West Pacific
  M2.6    0940UT  possible   lower  Mid East/Indian
  M1.8    1227UT  possible   lower  European

MUFs:
   Cocos Island Region:
      Enhanced by 30% during local day.
      Near predicted monthly values during local night.
      Enhanced by 45% after local dawn.
   Niue Island Region:
      Enhanced by 20% during local day.
      Enhanced by 30% during local night.
   Northern Australian Region:
      Enhanced by 15% during local day.
      Near predicted monthly values during local night.
   Southern Australian Region:
      Depressed by 30% during local day.
      Depressed by 25% during local night.
      Depressed by 20% after local dawn.
   Antarctic Region (Casey/Davis/Mawson):
      Depressed by 30% over the UT day.

PCA Event : No event.

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


2. FORECAST (01 OCTOBER - 03 OCTOBER)
Date   T index  Conditions       MUFs                              
01 Oct    75    Fair             Depressed 15 to 20%/near predicted 
                                 monthly values
02 Oct   110    Normal           Near predicted monthly values    
03 Oct   110    Normal-fair      Near predicted monthly values   

COMMENT: ASWFC SWF HF Communications Warning 86 was issued on 
28 September and is current for 29 Sep to 1 Oct. Maximum usable 
frequencies (MUFs) in the Australian region on UT day 30-Sep 
were variable. Northern Australian region MUFs were generally 
15% enhanced. MUFs in the southern Australian region were depressed 
20-30%. Southern Australian MUFs were depressed 20% after local 
dawn this morning. Spread F was observed at Hobart and Canberra 
during local night hours. Southern Australian region MUFs are 
expected to be depressed 15-20% on 01-Oct. Northern region MUFs 
are expected to be near predicted monthly values to 15% enhanced 
for 01-Oct. Isolated minor shortwave fadeouts are possible.

----------------------------------------------------------
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