[Ips-whfpr] ASWFC Weekly Prop. Report (10 September 25) issued 0351 UT on 10 Sep 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC WEEKLY HF PROPAGATION REPORT
ISSUED ON 10 SEPTEMBER 2025 
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (03 SEPTEMBER - 09 SEPTEMBER)
Date   T index   Conditions        
03 Sep   97      Normal            
MUFS:
   Cocos Island Region:
      No data available.
   Niue Island Region:
      Enhanced by 15% during local day.
      Enhanced by 30% during local night.
   Northern Australian Region:
      Near predicted monthly values.
   Southern Australian Region:
      Depressed by 25% during local day.
      Near predicted monthly values during local night.
   Antarctic Region (Casey/Davis/Mawson):
      Depressed by 15% over the UT day.

04 Sep  112      Normal            
MUFS:
   Cocos Island Region:
      No data available.
   Niue Island Region:
      Enhanced by 20% during local day.
      Enhanced by 45% during local night.
   Northern Australian Region:
      Near predicted monthly values.
   Southern Australian Region:
      Near predicted monthly values during local day.
      Enhanced by 15% during local night.
   Antarctic Region (Casey/Davis/Mawson):
      Near predicted monthly values over the UT day.

05 Sep  114      Fair-normal       
MUFS:
   Cocos Island Region:
      No data available.
   Niue Island Region:
      Enhanced by 15% during local day.
      Enhanced by 30% during local night.
      Enhanced by 20% after local dawn.
   Northern Australian Region:
      Near predicted monthly values during local day.
      Enhanced by 25% during local night.
   Southern Australian Region:
      Near predicted monthly values during local day.
      Enhanced by 15% during local night.
   Antarctic Region (Casey/Davis/Mawson):
      Near predicted monthly values over the UT day.

06 Sep  121      Fair-normal       
MUFS:
   Cocos Island Region:
      No data available.
   Niue Island Region:
      Enhanced by 35% during local day.
      Enhanced by 20% during local night.
   Northern Australian Region:
      Near predicted monthly values during local day.
      Enhanced by 15% during local night.
   Southern Australian Region:
      Enhanced by 20% during local day.
      Near predicted monthly values during local night.
   Antarctic Region (Casey/Davis/Mawson):
      Near predicted monthly values over the UT day.

07 Sep   92      Normal            
MUFS:
   Cocos Island Region:
      No data available.
   Niue Island Region:
      Near predicted monthly values.
   Northern Australian Region:
      Enhanced by 15% during local day.
      Near predicted monthly values during local night.
   Southern Australian Region:
      Near predicted monthly values during local day.
      Depressed by 20% during local night.
   Antarctic Region (Casey/Davis/Mawson):
      Near predicted monthly values over the UT day.

08 Sep  101      Normal            
MUFS:
   Cocos Island Region:
      No data available.
   Niue Island Region:
      Near predicted monthly values during local day.
      Depressed by 15% during local night.
   Northern Australian Region:
      Enhanced by 15% during local day.
      Enhanced by 35% during local night.
   Southern Australian Region:
      Enhanced by 15% during local day.
      Near predicted monthly values during local night.
   Antarctic Region (Casey/Davis/Mawson):
      Near predicted monthly values over the UT day.

09 Sep   84      Normal            
MUFS:
   Cocos Island Region:
      No data available.
   Niue Island Region:
      Enhanced by 20% during local day.
      Near predicted monthly values during local night.
   Northern Australian Region:
      Near predicted monthly values during local day.
      Depressed by 15% during local night.
   Southern Australian Region:
      Depressed by 15% during local day.
      Near predicted monthly values during local night.
   Antarctic Region (Casey/Davis/Mawson):
      Near predicted monthly values over the UT day.

Predicted Monthly T index for September:  92

2. FORECAST (10 SEPTEMBER - 16 SEPTEMBER) 
MUFS: MUFs are expected to be near predicted monthly values, 
however depressions of up to 15% are possible from 10-12 Sep 
due to expected geomagnetic activity from a recurrent 
southern hemisphere coronal hole. A further reduction of 15%
is possible 15-16 Sep due to a different recurrent coronal hole 
moving into a geoeffective position.
Shortwave fadeouts are possible.

Propagation conditions: HF propagation conditions are expected
to be mostly normal this week. Spread F is possible in southern
Australian regions during local night hours. Shortwave fadeouts 
are possible.

T index: 92

3. OUTLOOK (17 SEPTEMBER - 17 OCTOBER)
Degraded HF propagation conditions possible:
02-05 Oct.

PLEASE NOTE:
Space weather conditions can frequently be determined by short 
timescale events that cannot be forecast a week in advance,
particularly at solar maximum.

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