[Ips-dhfpr] ASWFC Daily HF Prop Report - 15 July 25 issued 2331 UT on 15 Jul 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/15 JULY 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (15 JULY) 
Date   T index  Conditions    
15 Jul    78    Normal-fair    

Flares: none.

MUFs:
   Cocos Island Region:
      Enhanced by 20% during local day.
      Depressed by 40% during local night.
      Depressed by 25% 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 25% during local night.
   Southern Australian Region:
      Near predicted monthly values.
   Antarctic Region (Casey/Davis/Mawson):
      Depressed by 25% over the UT day.

PCA Event : No event.

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


2. FORECAST (16 JULY - 18 JULY)
Date   T index  Conditions       MUFs                              
16 Jul    75    Normal-fair      Near predicted values to 20-30% 
                                 depressed
17 Jul    70    Normal-fair      Near predicted values to 20-30% 
                                 depressed    
18 Jul    70    Normal-fair      Near predicted monthly values   

COMMENT: Maximum usable frequencies (MUFs) in the Australian 
region were near predicted values to 25% depressed. Spread-F 
and sporadic-E were observed at most sites during local night 
and dawn hours, particularly in low latitudes. Conditions were 
degraded at low latitudes during local night and dawn hours. 
MUFs are expected to be near predicted values to 20-30% depressed 
over 16-18 Jul due to ongoing coronal hole effects. Sporadic-E 
and spread-F may be present during local night hours.

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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