[Ips-dhfpr] ASWFC Daily HF Prop Report - 22 May 23 issued 2335 UT on 22 May 2023 [SEC=OFFICIAL]

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SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/22 MAY 2023
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (22 MAY) 
Date   T index  Conditions    
22 May   102    Normal-fair    

Flares    Max     Fadeout    Freq.  Sectors
  M1.9    1337UT  possible   lower  European

MUFs:
   Cocos Island Region:
      Enhanced by 30% during local day.
      Depressed by 20% during local night.
   Niue Island Region:
      Near predicted monthly values.
   Northern Australian Region:
      Near predicted monthly values.
   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 (23 MAY - 25 MAY)
Date   T index  Conditions       MUFs                              
23 May   100    Fair             Near predicted monthly values
24 May   100    Fair             Near predicted monthly values    
25 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 22-May were near 
predicted monthly values in the Australian region. Spread-F was 
observed at Canberra, Hobart and Perth during local night hours. 
MUFs are expected to be near predicted monthly values over 23-25 
May, with a chance of mild depressions due to possible geomagnetic 
activity from 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