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

[Regional Warning Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/23 MAY 2023
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (23 MAY) 
Date   T index  Conditions    
23 May    92    Normal         

Flares    Max     Fadeout    Freq.  Sectors
  M3.0    1213UT  possible   lower  European

MUFs:
   Cocos Island Region:
      Enhanced by 20% during local day.
      Near predicted monthly values during local night.
   Niue Island Region:
      Near predicted monthly values during local day.
      Depressed by 15% 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/Scott Base/Davis/Mawson):
      Depressed by 20% over the UT day.

PCA Event : No event.

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


2. FORECAST (24 MAY - 26 MAY)
Date   T index  Conditions       MUFs                              
24 May   100    Normal           Near predicted monthly values
25 May   100    Normal           Near predicted monthly values    
26 May   100    Normal           Near predicted monthly values   

COMMENT: ASWFC HF Communications Warning 48 was issued on 21 
May and is current for 22-24 May. ASWFC SWF HF Communications 
Warning 49 was issued on 22 May and is current for 23-25 May. 
Maximum usable frequencies (MUFs) on UT day 23-May were near 
predicted monthly values in the northern Australian region and 
up to 15% depressed in the southern Australian region during 
local night. Spread-F and sporadic E were observed at Canberra, 
Hobart, Brisbane and Norfolk Island during local night hours. 
MUFs are expected to be near predicted monthly values over 24-26 
May, with a chance of mild depressions due to coronal hole high 
speed wind stream effects. Shortwave fadeouts are probable.

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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