[Ips-dhfpr] ASWFC Daily HF Prop Report - 09 July 25 issued 2332 UT on 09 Jul 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/09 JULY 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (09 JULY) 
Date   T index  Conditions    
09 Jul    82    Normal         

Flares    Max     Fadeout    Freq.  Sectors
  M1.3    0425UT  possible   lower  E. Asia/Aust.

MUFs:
   Cocos Island Region:
      Enhanced by 30% during local day.
      Near predicted monthly values during local night.
      Depressed by 30% after local dawn.
   Niue Island Region:
      Depressed by 20% during local day.
      Depressed by 25% during local night.
   Northern Australian Region:
      Near predicted monthly values during local day.
      Depressed by 30% during local night.
      Depressed by 20% 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 20% over the UT day.

PCA Event : No event.

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


2. FORECAST (10 JULY - 12 JULY)
Date   T index  Conditions       MUFs                              
10 Jul    80    Normal           Depressed 15 to 20%/near predicted 
                                 monthly values
11 Jul    80    Normal           Depressed 15 to 20%/near predicted 
                                 monthly values    
12 Jul    70    Normal-fair      Near predicted values to 20-30% 
                                 depressed   

COMMENT: ASWFC SWF HF Communications Warning 70 was issued on 
9 July and is current for 9-11 Jul. Maximum usable frequencies 
(MUFs) in the Australian region on UT day 9-Jul were near predicted 
values to 30% depressed during local night. Conditions were degraded 
in Townsville and Hobart during local dawn hours. Sporadic-E 
was observed at Norfolk Island during local day hours. MUFs are 
expected to be near predicted values to 20% depressed over 10-11 
Jul, then further depressions are possible by 12-Jul due to expected 
coronal hole activity.

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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