[Ips-dhfpr] ASWFC Daily HF Prop Report - 13 July 25 issued 2332 UT on 13 Jul 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/13 JULY 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (13 JULY) 
Date   T index  Conditions    
13 Jul    86    Fair-normal    

Flares: none.

MUFs:
   Cocos Island Region:
      Near predicted monthly values during local day.
      Depressed by 35% during local night.
      Depressed by 35% after local dawn.
   Niue Island Region:
      Depressed by 20% during local day.
      Depressed by 30% 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):
      Depressed by 30% over the UT day.

PCA Event : No event.

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


2. FORECAST (14 JULY - 16 JULY)
Date   T index  Conditions       MUFs                              
14 Jul    85    Normal-fair      Depressed 10 to 15%/near predicted 
                                 monthly values
15 Jul    85    Fair-normal      Depressed 10 to 15%/near predicted 
                                 monthly values    
16 Jul    85    Normal           Depressed 10 to 15%/near predicted 
                                 monthly values   

COMMENT: ASWFC SWF HF Communications Warning 71 was issued on 
12 July and is current for 12-14 Jul. Maximum usable frequencies 
(MUFs) in the Australian region on UT day 13-Jul were 25% depressed 
to near predicted monthly values, with depressed conditions during 
local night hours in the northern Australian region. Spread F 
was observed during local night hours at Darwin, Townsville, 
Canberra and Hobart. MUFs are expected to be 10-15% depressed 
to near predicted monthly values over 14-16 Jul. Degraded HF 
conditions may be experienced during local night hours. 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