[Ips-dhfpr] ASWFC Daily HF Prop Report - 26 May 25 issued 2332 UT on 26 May 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/26 MAY 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (26 MAY) 
Date   T index  Conditions    
26 May    77    Normal         

Flares    Max     Fadeout    Freq.  Sectors
  M2.9    1306UT  possible   lower  European

MUFs:
   Cocos Island Region:
      Depressed by 15% during local day.
      Depressed by 30% during local night.
   Niue Island Region:
      No data available during local day.
      No data available during local night.
   Northern Australian Region:
      Depressed by 15% during local day.
      Depressed by 30% during local night.
      Depressed by 20% after local dawn.
   Southern Australian Region:
      Near predicted monthly values during local day.
      Depressed by 20% during local night.
      Depressed by 20% after local dawn.
   Antarctic Region (Casey/Davis/Mawson):
      Near predicted monthly values over the UT day.

PCA Event : No event.

Monthly T index:
Month  T index
Apr      123
May      113
Jun      111


2. FORECAST (27 MAY - 29 MAY)
Date   T index  Conditions       MUFs                              
27 May    75    Normal           15 to 20% below predicted monthly 
                                 values
28 May    75    Normal-fair      15 to 20% below predicted monthly 
                                 values    
29 May    80    Normal-fair      15 to 20% below predicted monthly 
                                 values   

COMMENT: ASWFC SWF HF Communications Warning 52 was issued on 
25 May and is current for 25-27 May. ASWFC HF Communications 
Warning 53 was issued on 25 May and is current for 26-27 May. 
Maximum usable frequencies (MUFs) in the Australian region on 
UT day 26-May were near predicted monthly values to 30% depressed. 
Spread F was observed at Hobart, Canberra, Townsville and Brisbane 
during local night hours. MUFs are expected to be 15-20% depressed 
over 27-29 May. 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