[Ips-dhfpr] ASWFC Daily HF Prop Report - 19 May 23 issued 2330 UT on 19 May 2023 [SEC=OFFICIAL]

[Regional Warning Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/19 MAY 2023
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (19 MAY) 
Date   T index  Conditions    
19 May    88    Normal         

Flares    Max     Fadeout    Freq.  Sectors
  M5.3    0048UT  possible   lower  West Pacific
  M1.6    0312UT  possible   lower  E. Asia/Aust.
  M2.5    0500UT  possible   lower  E. Asia/Aust.
  M2.3    2006UT  possible   lower  East Pacific/
                                    North American

MUFs:
   Cocos Island Region:
      Near predicted monthly values.
   Niue Island Region:
      Enhanced by 25% during local day.
      Near predicted monthly values during local night.
   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 (20 MAY - 22 MAY)
Date   T index  Conditions       MUFs                              
20 May    90    Normal-fair      Near predicted monthly values 
                                 to 15% depressed
21 May    85    Normal-fair      Near predicted monthly values 
                                 to 10% depressed    
22 May    90    Normal           Near predicted monthly values   

COMMENT: ASWFC SWF HF Communications Warning 47 was issued on 
19 May and is current for 20-22 May. Maximum usable frequencies 
(MUFs) on UT day 19-May were near predicted monthly values in 
the Australian region. Spread-F was observed at Hobart; sporadic-E 
was observed at Townsville, and degraded conditions were observed 
at Darwin during local night hours. MUFs are expected to be near 
predicted monthly values over 20-22 May, with some mild depressions 
possible. 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