[Ips-dhfpr] ASWFC Daily HF Prop Report - 11 July 25 issued 2332 UT on 11 Jul 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/11 JULY 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (11 JULY) 
Date   T index  Conditions    
11 Jul    76    Fair-normal    

Flares: none.

MUFs:
   Cocos Island Region:
      Enhanced by 20% during local day.
      Depressed by 20% during local night.
      Depressed by 25% after local dawn.
   Niue Island Region:
      Depressed by 15% during local day.
      Depressed by 35% during local night.
   Northern Australian Region:
      Depressed by 20% during local day.
      Depressed by 20% during local night.
      Depressed by 25% after local dawn.
   Southern Australian Region:
      Depressed 15% to near predicted monthly values.
   Antarctic Region (Casey/Davis/Mawson):
      Near predicted monthly values over the UT day.

PCA Event : No event.

Monthly T index:
Month  T index
Jun      79
Jul      104
Aug      102


2. FORECAST (12 JULY - 14 JULY)
Date   T index  Conditions       MUFs                              
12 Jul    75    Fair-normal      Depressed 15 to 20%/near predicted 
                                 monthly values
13 Jul    75    Fair-normal      Depressed 15 to 20%/near predicted 
                                 monthly values    
14 Jul    75    Normal           Depressed 15 to 20%/near predicted 
                                 monthly values   

COMMENT: Maximum usable frequencies (MUFs) in the Australian 
region on UT day 11-Jul were 25% depressed to near predicted 
monthly values, with depressed conditions in the the northern 
Australian region. Spread F was observed during local night hours 
at Townsville, Learmonth, Perth and Hobart. MUFs are expected 
to be 15-20% depressed to near predicted monthly values over 
12-14 Jul. Degraded HF conditions are expected during local night 
hours due to mild geomagnetic activity induced by 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