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

[Regional Warning Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/23 JUNE 2023
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (23 JUNE) 
Date   T index  Conditions    
23 Jun   109    Normal-fair    

Flares    Max     Fadeout    Freq.  Sectors
  M4.9 22/2344UT  possible   lower  West Pacific

MUFs:
   Cocos Island Region:
      Enhanced by 15-20%.
   Niue Island Region:
      Near predicted monthly values during local day.
      Depressed by 15% during local night.
   Northern Australian Region:
      Near predicted monthly values during local day.
      Depressed by 15% during local night.
   Southern Australian Region:
      Near predicted monthly values during local day.
      Enhanced by 15% during local night.
   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
May      98
Jun      88
Jul      87


2. FORECAST (24 JUNE - 26 JUNE)
Date   T index  Conditions       MUFs                              
24 Jun   100    Normal-fair      Near predicted monthly values
25 Jun   100    Normal-fair      Near predicted monthly values    
26 Jun   100    Fair             Near predicted monthly values   

COMMENT: ASWFC SWF HF Communications Warning 58 was issued on 
23 June and is current for 23-25 Jun. Maximum usable frequencies 
(MUFs) on UT day 23-Jun in the Australian region were generally 
near predicted monthly values. Spread F was observed during local 
night hours. MUFs are expected to be near predicted values over 
24-26 Jun. Mildly degraded conditions are possible during local 
night hours. Moderately degraded HF conditions may be experienced 
for the southern Australian region on 26-Jun due to an anticipated 
glancing blow from a recent CME. Isolated shortwave fadeouts 
are probable. A very minor fadeout impacting the E region ionospheric 
layer was observed yesterday at Darwin in association with M4 
flare 22/2344UT.

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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