[Ips-dhfpr] ASWFC Daily HF Prop Report - 12 July 25 issued 2332 UT on 12 Jul 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/12 JULY 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (12 JULY) 
Date   T index  Conditions    
12 Jul    72    Fair-normal    

Flares    Max     Fadeout    Freq.  Sectors
  M1.4    0402UT  possible   lower  E. Asia/Aust.
  M2.3    0834UT  possible   lower  Mid East/Indian
  M1.6    1210UT  possible   lower  European

MUFs:
   Cocos Island Region:
      Near predicted monthly values during local day.
      Depressed by 35% during local night.
   Niue Island Region:
      Near predicted monthly values during local day.
      Depressed by 20% during local night.
   Northern Australian Region:
      Depressed by 15% 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 (13 JULY - 15 JULY)
Date   T index  Conditions       MUFs                              
13 Jul    75    Fair-normal      Depressed 15 to 20%/near predicted 
                                 monthly values
14 Jul    75    Fair-normal      Depressed 15 to 20%/near predicted 
                                 monthly values    
15 Jul    75    Normal           Depressed 15 to 20%/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 12-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, Norfolk Island 
and Hobart. MUFs are expected to be 15-20% depressed to near 
predicted monthly values over 13-15 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