[Ips-dhfpr] ASWFC Daily HF Prop Report - 05 August 25 issued 2330 UT on 05 Aug 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/05 AUGUST 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (05 AUGUST) 
Date   T index  Conditions    
05 Aug    95    Normal         

Flares    Max     Fadeout    Freq.  Sectors
  M1.1    0212UT  possible   lower  E. Asia/Aust.
  M4.4    1553UT  possible   lower  South American/
                                    Atlantic

MUFs:
   Cocos Island Region:
      Enhanced by 15% during local day.
      Enhanced by 30% during local night.
   Niue Island Region:
      Near predicted monthly values during local day.
      Depressed by 25% during local night.
   Northern Australian Region:
      Near predicted monthly values during local day.
      Depressed by 15% during local night.
   Southern Australian Region:
      Near predicted monthly values.
   Antarctic Region (Casey/Davis/Mawson):
      Near predicted monthly values over the UT day.

PCA Event : No event.

Monthly T index:
Month  T index
Jul      88
Aug      96
Sep      93


2. FORECAST (06 AUGUST - 08 AUGUST)
Date   T index  Conditions       MUFs                              
06 Aug    90    Normal           Near predicted monthly values
07 Aug    90    Normal           Near predicted monthly values    
08 Aug    90    Normal-fair      Near predicted monthly values   

COMMENT: ASWFC SWF HF Communications Warning 73 was issued on 
4 August and is current for 5-7 Aug. Maximum usable frequencies 
(MUFs) in the Australian region on UT day 06-Aug were near predicted 
monthly values, with depressions observed in the northern Australian 
region during local night hours. Spread F was observed at Hobart, 
Canberra, Townsville and Perth during local night hours. MUFs 
are expected to be near predicted monthly values over 06-08 Aug, 
with a slight chance of mild depressions on 08-Aug in the southern 
Australian region due to possible geomagnetic activity. Shortwave 
fadeouts are probable.

----------------------------------------------------------
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