[Ips-dhfpr] ASWFC Daily HF Prop Report - 13 June 25 issued 2330 UT on 13 Jun 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

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

1. SUMMARY (13 JUNE) 
Date   T index  Conditions    
13 Jun   104    Poor-fair      

Flares    Max     Fadeout    Freq.  Sectors
  M1.2    2111UT  possible   lower  East Pacific/
                                    North American

MUFs:
   Cocos Island Region:
      Near predicted monthly values during local day.
      Enhanced by 20% during local night.
   Niue Island Region:
      Near predicted monthly values during local day.
      Enhanced by 70% during local night.
   Northern Australian Region:
      Mostly near predicted monthly values.
      Enhanced 20% after local dawn.
   Southern Australian Region:
      Depressed 25% during the local day.
      Depressed by 30% all day at Hobart.
      Generally near predicted values during the local night.
      Depressed 20% after local dawn.
   Antarctic Region (Casey/Davis/Mawson):
      Depressed by 45% over the UT day.
      Strong spread F and sporadic E.

PCA Event : No event.

Monthly T index:
Month  T index
May      94
Jun      109
Jul      107


2. FORECAST (14 JUNE - 16 JUNE)
Date   T index  Conditions       MUFs                              
14 Jun    85    Poor-fair        Depressed 15 to 30% southern 
                                 Aus./15% enhanced northern Aus.
15 Jun    95    Fair             Depressed 10 to 20%/near predicted 
                                 monthly values    
16 Jun   110    Normal           Near predicted monthly values   

COMMENT: ASWFC HF Communications Warning 63 was issued on 13 
June and is current for 14 Jun only. Maximum usable frequencies 
(MUFs) in the Australian region on UT day 13-Jun were generally 
25% depressed in the southern Australian region, with Hobart 
MUFs depressed by up to 30% throughout the day. Southern Australian 
region MUFs are currently 15-30% depressed after local dawn this 
morning. Strong spread F was observed at Hobart during local 
night hours. Northern Australian MUFs remained mostly near predicted 
monthly vales. Antarctic conditions were poor. Strong equatorial 
spread F was observed at Niue during local night hours with an 
associated strong enhancement in local night MUFs. Ionospheric 
scintillation was observed 13/0832-1405UT at Niue. For 14-Jun 
MUFs are expected to be depressed 15-30% for the southern Australian 
region and near predicted monthly values to 15% enhanced for 
the northern Australian region. Isolated brief minor 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