[Ips-dhfpr] ASWFC Daily HF Prop Report - 20 June 25 issued 2331 UT on 20 Jun 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/20 JUNE 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (20 JUNE) 
Date   T index  Conditions    
20 Jun    88    Normal-fair    

Flares    Max     Fadeout    Freq.  Sectors
  X1.9 19/2350UT  probable   all    West Pacific
  M1.0    1740UT  possible   lower  South American/
                                    Atlantic

MUFs:
   Cocos Island Region:
      Enhanced by 15% during local day.
      Near predicted monthly values during local night.
   Niue Island Region:
      Depressed by 15% during local day.
      Depressed by 40% during local night.
      Depressed by 20% after local dawn.
   Northern Australian Region:
      Near predicted monthly values during local day.
      Depressed by 25% during local night.
      Depressed by 20% after local dawn.
   Southern Australian Region:
      Depressed by 15% during local day.
      Near predicted monthly values 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
May      94
Jun      109
Jul      107


2. FORECAST (21 JUNE - 23 JUNE)
Date   T index  Conditions       MUFs                              
21 Jun    85    Normal-fair      Near predicted monthly values 
                                 to 20% depressed
22 Jun    85    Normal-fair      Near predicted monthly values 
                                 to 20% depressed    
23 Jun    85    Normal-fair      Near predicted monthly values 
                                 to 20% depressed   

COMMENT: Maximum usable frequencies (MUFs) in the Australian 
region on UT day 20-Jun were near predicted values to 25% depressed. 
Conditions were especially degraded in the northern Australian 
region near local dawn hours, where sporadic-E was common. MUFs 
are expected to be near predicted values to 20% depressed during 
local night and dawn hours over 21-23 Jun.

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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