[Ips-dhfpr] ASWFC Daily HF Prop Report - 26 May 23 issued 2331 UT on 26 May 2023 [SEC=OFFICIAL]

[Regional Warning Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/26 MAY 2023
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (26 MAY) 
Date   T index  Conditions    
26 May    82    Fair-normal    

Flares    Max     Fadeout    Freq.  Sectors
  M1.3    2303UT  possible   lower  West Pacific

MUFs:
   Cocos Island Region:
      Enhanced by 15-45%.
   Niue Island Region:
      Near predicted monthly values during local day.
      Depressed by 20% during local night.
   Northern Australian Region:
      Near predicted monthly values during local day.
      Depressed by 20% during local night.
   Southern Australian Region:
      Near predicted monthly values.
   Antarctic Region (Casey/Scott Base/Davis/Mawson):
      Near predicted monthly values over the UT day.

PCA Event : No event.

Monthly T index:
Month  T index
Apr      120
May      87
Jun      88


2. FORECAST (27 MAY - 29 MAY)
Date   T index  Conditions       MUFs                              
27 May    95    Normal           Near predicted monthly values
28 May    95    Normal           Near predicted monthly values    
29 May    95    Normal           Near predicted monthly values   

COMMENT: ASWFC SWF HF Communications Warning 51 was issued on 
25 May and is current for 26-28 May. Maximum usable frequencies 
(MUFs) on UT day 26-May were generally near predicted monthly 
values in the Australian region, with depressions of up to 20% 
observed during local night hours. Spread-F was observed in Townsville, 
Brisbane, Canberra and Hobart during local night hours. Sporadic 
E was occasionally observed at Darwin. MUFs are expected to be 
near predicted monthly values over 27-29 May. Isolated shortwave 
fadeouts are possible. A minor fadeout impacting lower HF frequencies 
associated with the M1 flare was observed at Niue at the time 
of issue of this report.

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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