[Ips-dhfpr] ASWFC Daily HF Prop Report - 21 June 25 issued 2330 UT on 21 Jun 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/21 JUNE 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (21 JUNE) 
Date   T index  Conditions    
21 Jun    81    Normal-fair    

Flares: none.

MUFs:
   Cocos Island Region:
      Near predicted monthly values during local day.
      Depressed by 15% during local night.
   Niue Island Region:
      Near predicted monthly values during local day.
      Depressed by 35% during local night.
      Depressed by 20% after local dawn.
   Northern Australian Region:
      Near predicted monthly values during local day.
      Depressed by 20% during local night.
      Depressed by 20% after local dawn.
   Southern Australian Region:
      Depressed by 15% during local day.
      Depressed by 15% 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 (22 JUNE - 24 JUNE)
Date   T index  Conditions       MUFs                              
22 Jun    85    Normal-fair      Near predicted monthly values 
                                 to 10-20% depressed
23 Jun    85    Normal-fair      Near predicted monthly values 
                                 to 10-20% depressed    
24 Jun    85    Normal-fair      Near predicted monthly values 
                                 to 10-20% depressed   

COMMENT: ASWFC HF Communications Warning 67 was issued on 21 
June and is current for 22-24 Jun. Maximum usable frequencies 
(MUFs) in the Australian region were 15-20% depressed on UT day 
21-Jun. Conditions were generally degraded in the northern Australian 
region and sporadic-E was common during local night hours. MUFs 
are expected to be similar over 22-24 Jun, being 10-20% depressed, 
especially 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