[Ips-whfpr] ASWFC Weekly Prop. Report (23 July 25) issued 0138 UT on 23 Jul 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC WEEKLY HF PROPAGATION REPORT
ISSUED ON 23 JULY 2025 
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (16 JULY - 22 JULY)
Date   T index   Conditions        
16 Jul   77      Fair-normal       
MUFS:
   Cocos Island Region:
      Near predicted monthly values during local day.
      Depressed by 40% during local night.
      Depressed by 25% after local dawn.
   Niue Island Region:
      Depressed by 15% during local day.
      Depressed by 20% during local night.
   Northern Australian Region:
      Near predicted monthly values during local day.
      Depressed by 30% during local night.
   Southern Australian Region:
      Near predicted monthly values.
   Antarctic Region (Casey/Davis/Mawson):
      Depressed by 20% over the UT day.

17 Jul   86      Normal            
MUFS:
   Cocos Island Region:
      Enhanced by 15% during local day.
      Depressed by 45% during local night.
      Depressed by 20% after local dawn.
   Niue Island Region:
      Near predicted monthly values during local day.
      Depressed by 25% during local night.
   Northern Australian Region:
      Depressed by 15% during local day.
      Depressed by 15% during local night.
      Depressed by 20% after local dawn.
   Southern Australian Region:
      Near predicted monthly values.
   Antarctic Region (Casey/Davis/Mawson):
      Depressed by 20% over the UT day.

18 Jul   98      Normal            
MUFS:
   Cocos Island Region:
      Mostly near predicted monthly values.
      Depressed by 20% after local dawn.
   Niue Island Region:
      Enhanced by 30% during local day.
      Enhanced by 30% during local night.
   Northern Australian Region:
      Near predicted monthly values during local day.
      Depressed by 15% during local night.
   Southern Australian Region:
      Near predicted monthly values.
   Antarctic Region (Casey/Davis/Mawson):
      Near predicted monthly values over the UT day.

19 Jul   95      Normal            
MUFS:
   Cocos Island Region:
      Enhanced by 30% during local day.
      Depressed by 20% during local night.
      Depressed by 30% after local dawn.
   Niue Island Region:
      Near predicted monthly values.
   Northern Australian Region:
      Near predicted monthly values during local day.
      Depressed by 20% during local night.
      Depressed 20% after local dawn.
   Southern Australian Region:
      Near predicted monthly values.
   Antarctic Region (Casey/Davis/Mawson):
      Depressed by 20% over the UT day.

20 Jul   87      Normal            
MUFS:
   Cocos Island Region:
      Near predicted monthly values during local day.
      Depressed by 35% during local night.
      Depressed by 30% after local dawn.
   Niue Island Region:
      Near predicted monthly values during local day.
      Depressed by 15% during local night.
   Northern Australian Region:
      Near predicted monthly values during local day.
      Depressed by 15% during local night.
   Southern Australian Region:
      Near predicted monthly values during local day.
      Depressed by 15% during local night.
   Antarctic Region (Casey/Davis/Mawson):
      Near predicted monthly values over the UT day.

21 Jul   88      Fair-normal       
MUFS:
   Cocos Island Region:
      Enhanced by 30% during local day.
      Near predicted monthly values during local night.
      Depressed by 20% after local dawn.
   Niue Island Region:
      Near predicted monthly values during local day.
      Depressed by 30% during local night.
   Northern Australian Region:
      Near predicted monthly values during local day.
      Depressed by 15% during local night.
      Depressed by 15% after local dawn.
   Southern Australian Region:
      Near predicted monthly values during local day.
      Depressed by 20% during local night.
   Antarctic Region (Casey/Davis/Mawson):
      Depressed by 15% over the UT day.

22 Jul   81      Fair-normal       
MUFS:
   Cocos Island Region:
      Near predicted monthly values during local day.
      Depressed by 35% during local night.
   Niue Island Region:
      Depressed by 15% during local day.
      Depressed by 25% during local night.
   Northern Australian Region:
      Near predicted monthly values during local day.
      Depressed by 25% during local night.
   Southern Australian Region:
      Near predicted monthly values.
   Antarctic Region (Casey/Davis/Mawson):
      Near predicted monthly values over the UT day.

Predicted Monthly T index for July: 104

2. FORECAST (23 JULY - 29 JULY) 
MUFS are expected to be near predicted monthly values
to depressed 20% over 23-24 Jul gradually becoming 
near predicted monthly values later in the week.
Isolated minor SWFs are possible over the week.

Propagation conditions: Fair on 23-24 Jul for the southern
Australian region gradually improving to normal later in
the week.

T index: 85

3. OUTLOOK (30 JULY - 29 AUGUST)
Degraded HF propagation conditions possible:
31 Jul to 3 Aug, 10-13 Aug, 18-20 Aug, 27-29 Aug

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