[Ips-dhfpr] ASWFC Daily HF Prop Report - 18 May 23 issued 2331 UT on 18 May 2023 [SEC=OFFICIAL]

Regional Warning Centre rwc at ips.gov.au
Fri May 19 09:31:26 EST 2023


SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/18 MAY 2023
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (18 MAY) 
Date   T index  Conditions    
18 May    89    Normal         

Flares    Max     Fadeout    Freq.  Sectors
  M1.0    0626UT  possible   lower  Mid East/Indian
  M1.2    0655UT  possible   lower  Mid East/Indian
  M2.2    1147UT  possible   lower  European
  M1.1    1751UT  possible   lower  South American/
                                    Atlantic
  M3.8    2023UT  possible   lower  East Pacific/
                                    North American
  M4.5    2105UT  possible   lower  East Pacific/
                                    North American

MUFs:
   Cocos Island Region:
      Near predicted monthly values.
   Niue Island Region:
      Near predicted monthly values during local day.
      Enhanced by 30% 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 (19 MAY - 21 MAY)
Date   T index  Conditions       MUFs                              
19 May    90    Normal           Near predicted monthly values
20 May    95    Normal           Near predicted monthly values    
21 May    95    Normal           Near predicted monthly values   

COMMENT: ASWFC SWF HF Communications Warning 46 was issued on 
18 May and is current for 18-20 May. Maximum usable frequencies 
(MUFs) on UT day 18-May were near predicted monthly values in 
the Australian region. Spread-F was observed at Darwin and Hobart 
during local night hours. Small amounts of sporadic E were observed 
across the Australian region. MUFs are expected to be near predicted 
monthly values over 19-21 May. Shortwave fadeouts are possible.

----------------------------------------------------------
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



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