[Ips-dhfpr] ASWFC Daily HF Prop Report - 20 April 23 issued 2330 UT on 20 Apr 2023 [SEC=OFFICIAL]

[Regional Warning Centre]

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

1. SUMMARY (20 APRIL) 
Date   T index  Conditions    
20 Apr   125    Fair-normal    

Flares: none.

MUFs:
   Cocos Island Region:
      Enhanced by 15% during local day.
      Enhanced by 50% during local night.
   Niue Island Region:
      Enhanced by 50% during local day.
      Enhanced by 50% during local night.
      Enhanced by 20% after local dawn.
   Northern Australian Region:
      Enhanced by 15% during local day.
      Enhanced by 30% during local night.
   Southern Australian Region:
      Enhanced by 15% during local day.
      Enhanced by 25% 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
Mar      132
Apr      84
May      84


2. FORECAST (21 APRIL - 23 APRIL)
Date   T index  Conditions       MUFs                              
21 Apr   120    Normal-fair      15-30% above predicted monthly 
                                 values
22 Apr   115    Normal-fair      Near predicted monthly values 
                                 to 15% enhanced    
23 Apr   120    Normal-fair      15-30% above predicted monthly 
                                 values   

COMMENT: Maximum usable frequencies (MUFs) on UT day 20-Apr in 
the Australian region were enhanced by 15-30%. Sporadic-E was 
observed at Canberra and Brisbane. Spread F was observed at Hobart. 
Scintillation was observed at Niue from 0724-0840UT. MUFs are 
expected to be 15-25% enhanced over 21-23 Apr, possibly tending 
towards monthly predicted values on 22-Apr due to a low chance 
of geomagnetic activity on 21-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