[Ips-dhfpr] ASWFC Daily HF Prop Report - 04 July 25 issued 2330 UT on 04 Jul 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/04 JULY 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (04 JULY) 
Date   T index  Conditions    
04 Jul    92    Normal         

Flares: none.

MUFs:
   Cocos Island Region:
      Near predicted monthly values during local day.
      Depressed by 30% during local night.
      Depressed by 20% after local dawn.
   Niue Island Region:
      Depressed by 15% during local day.
      Near predicted monthly values 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 35% over the UT day.

PCA Event : No event.

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


2. FORECAST (05 JULY - 07 JULY)
Date   T index  Conditions       MUFs                              
05 Jul    70    Normal           Depressed 10 to 20%/near predicted 
                                 monthly values
06 Jul    80    Normal           Depressed 10 to 15%/near predicted 
                                 monthly values    
07 Jul    90    Normal           Near predicted monthly values   

COMMENT: ASWFC Preliminary HF Communications Warning 68 was issued 
on 4 July and is current for 4-6 Jul. Maximum usable frequencies 
(MUFs) in the Australian region on UT day 4-Jul were near predicted 
values to 25% depressed. Conditions at low latitudes were degraded 
during local dawn hours. Scintillation was observed at Niue from 
0940-1007UT. MUFs are expected to be near predicted values to 
10-20% depressed on 5-Jul due to coronal hole activity, on an 
improving trend over 6-7 Jul.

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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