[Ips-dhfpr] ASWFC Daily HF Prop Report - 21 April 23 issued 2331 UT on 21 Apr 2023 [SEC=OFFICIAL]

[Regional Warning Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/21 APRIL 2023
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (21 APRIL) 
Date   T index  Conditions    
21 Apr   114    Normal         

Flares    Max     Fadeout    Freq.  Sectors
  M1.7    1813UT  possible   lower  East Pacific/
                                    North American

MUFs:
   Cocos Island Region:
      Enhanced by 20% during local day.
      Enhanced by 45% during local night.
   Niue Island Region:
      Enhanced by 30% during local day.
      Enhanced by 45% during local night.
   Northern Australian Region:
      Enhanced by 15% during local day.
      Near predicted monthly values during local night.
   Southern Australian Region:
      Enhanced by 15% during local day.
      Enhanced by 20% during local night.
   Antarctic Region (Casey/Scott Base/Davis/Mawson):
      Enhanced by 30% over the UT day.

PCA Event : No event.

Monthly T index:
Month  T index
Mar      132
Apr      84
May      84


2. FORECAST (22 APRIL - 24 APRIL)
Date   T index  Conditions       MUFs                              
22 Apr   115    Normal           Near to 15% above predicted 
                                 monthly values
23 Apr    95    Poor             Near predicted monthly values    
24 Apr    60    Fair             Depressed 15%/near predicted 
                                 monthly values   

COMMENT: Maximum usable frequencies (MUFs) on UT day 21-Apr in 
the Australian region were enhanced by 15-20%. Sporadic-E was 
observed at Brisbane. Spread F was observed at Hobart during 
local night hours. MUFs are expected to be 15-25% enhanced on 
22-Apr. MUFs are expected to be near predicted monthly values 
on 23-Apr and depressed by 15% on 24-Apr due to a CME impact 
on 23-Apr.

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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