[Ips-dhfpr] ASWFC Daily HF Prop Report - 20 June 23 issued 2331 UT on 20 Jun 2023 [SEC=OFFICIAL]

[Regional Warning Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/20 JUNE 2023
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (20 JUNE) 
Date   T index  Conditions    
20 Jun    99    Normal-fair    

Flares    Max     Fadeout    Freq.  Sectors
  M1.0    1114UT  possible   lower  European
  M1.8    1126UT  possible   lower  European
  M1.0    1548UT  possible   lower  South American/
                                    Atlantic
  M1.1    1633UT  possible   lower  South American/
                                    Atlantic
  X1.1    1709UT  probable   all    South American/
                                    Atlantic

MUFs:
   Cocos Island Region:
      Near predicted monthly values during local day.
      Depressed by 15% during local night.
   Niue Island Region:
      Mostly near predicted monthly values.
   Northern Australian Region:
      Mostly near predicted monthly values.
      Enhanced by 25% after local dawn.
   Southern Australian Region:
      Mostly near predicted monthly values.
      Enhanced by 20% after local dawn.
   Antarctic Region (Casey/Scott Base/Davis/Mawson):
      Depressed by 15% over the UT day.

PCA Event : No event.

Monthly T index:
Month  T index
May      98
Jun      88
Jul      87


2. FORECAST (21 JUNE - 23 JUNE)
Date   T index  Conditions       MUFs                              
21 Jun   100    Normal           Near to 15% above predicted 
                                 monthly values
22 Jun   100    Normal           Near to 15% above predicted 
                                 monthly values    
23 Jun   100    Normal           Near to 15% above predicted 
                                 monthly values   

COMMENT: ASWFC SWF HF Communications Warning 56 was issued on 
18 June and is current for 19-21 Jun. Maximum usable frequencies 
(MUFs) on UT day 20-Jun in the Australian region were generally 
near predicted monthly values. Spread F was observed during local 
night hours for the south eastern Australian region and at Townsville. 
MUFs are expected to be mostly near predicted values to 15% enhanced 
over 21-23 Jun. Mildly degraded conditions may be experienced 
during local night hours. Increased chance of 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