[Ips-dhfpr] SWS Daily HF Prop Report - 17 April 22 issued 2330 UT on 17 Apr 2022 [SEC=OFFICIAL]

[Regional Warning Centre]

SUBJ: SWS DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/17 APRIL 2022 BY Space Weather Services
FROM THE AUSTRALIAN SPACE FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (17 APRIL) 
Date   T index  Conditions    
17 Apr    66    Normal         

Flares    Max     Fadeout    Freq.  Sectors
  M1.8    0211UT  possible   lower  E. Asia/Aust.
  X1.2    0334UT  probable   all    E. Asia/Aust.
  M1.5    2002UT  possible   lower  East Pacific/
                                    North American
  M4.4    2234UT  possible   lower  East Pacific/
                                    North American

MUFs:
   Cocos Island Region:
      Enhanced by 30% during local day.
      Enhanced by 15% during local night.
   Niue Island Region:
      Enhanced by 35% during local day.
      Near predicted monthly values during local night.
      Enhanced by 20% after local dawn.
   Northern Australian Region:
      Enhanced by 20% during local day.
      Near predicted monthly values during local night.
   Southern Australian Region:
      Mostly near predicted monthly values.
   Antarctic Region (Casey/Scott Base/Davis/Mawson):
      Enhanced by 15% over the UT day.

PCA Event : No event.

Monthly T index:
Month  T index
Mar      64
Apr      46
May      49


2. FORECAST (18 APRIL - 20 APRIL)
Date   T index  Conditions       MUFs                              
18 Apr    75    Normal           Near predicted monthly values 
                                 to 25% enhanced
19 Apr    75    Normal           Near predicted monthly values 
                                 to 25% enhanced    
20 Apr    75    Normal           Near predicted monthly values 
                                 to 25% enhanced   

COMMENT: SWS SWF HF Communications Warning 35 was issued on 16 
April and is current for 16-18 Apr. Maximum usable frequencies 
(MUFs) on UT day 17 Apr were mostly enhanced at lower latitudes 
and nearer monthly predicted values at mid-latitudes. Night time 
spread F was observed at Hobart. MUFs are expected to be near 
predicted monthly values to 25% enhanced 18-20 Apr. Short-wave 
fadeouts are likely.

----------------------------------------------------------
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.

Space Weather Services              email: asfc at bom.gov.au
Bureau of Meteorology
PO Box 1386                         WWW: http://www.sws.bom.gov.au
Haymarket NSW 1240  AUSTRALIA       FTP: ftp://ftp-out.sws.bom.gov.au
tel: +61 2 9213 8010                fax: +61 2 9213 8060 

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