[Ips-dhfpr] ASWFC Daily HF Prop Report - 17 May 23 issued 2330 UT on 17 May 2023 [SEC=OFFICIAL]

[Regional Warning Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/17 MAY 2023
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (17 MAY) 
Date   T index  Conditions    
17 May    88    Normal         

Flares: none.

MUFs:
   Cocos Island Region:
      Near predicted monthly values.
   Niue Island Region:
      Near predicted monthly values.
   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 (18 MAY - 20 MAY)
Date   T index  Conditions       MUFs                              
18 May    90    Normal           Near predicted monthly values
19 May    90    Normal           Near predicted monthly values    
20 May    95    Normal           Near predicted monthly values   

COMMENT: Maximum usable frequencies (MUFs) on UT day 17-May were 
near predicted monthly values in the Australian region, with 
depressions of up to 20% observed in the northern Australian 
region during local night. Spread-F was observed at Canberra, 
Darwin and Hobart during local night hours. Sporadic E was observed 
at Perth and Cocos Islands. MUFs are expected to be near predicted 
monthly values over 18-20 May. Isolated shortwave fadeouts are 
possible.

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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