[Ips-dhfpr] SWS Daily HF Prop Report - 18 July 22 issued 2330 UT on 18 Jul 2022 [SEC=OFFICIAL]

[Regional Warning Centre]

SUBJ: SWS DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/18 JULY 2022 BY Space Weather Services
FROM THE AUSTRALIAN SPACE FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (18 JULY) 
Date   T index  Conditions    
18 Jul    87    Normal         

Flares: none.

MUFs:
   Cocos Island Region:
      Enhanced by 40% during local day.
      Depressed by 25% during local night.
   Niue Island Region:
      Enhanced by 15% during local day.
      Near predicted monthly values during local night.
      Enhanced by 25% after local dawn.
   Northern Australian Region:
      Mostly near predicted monthly values.
   Southern Australian Region:
      Mostly near predicted monthly values.
   Antarctic Region (Casey/Scott Base/Davis/Mawson):
      Enhanced by 30% over the UT day.

PCA Event : No event.

Monthly T index:
Month  T index
Jun      60
Jul      65
Aug      67


2. FORECAST (19 JULY - 21 JULY)
Date   T index  Conditions       MUFs                              
19 Jul    85    Normal-fair      Near to 15% above predicted 
                                 monthly values
20 Jul    75    Normal-fair      Near predicted monthly values    
21 Jul    75    Normal-fair      Near predicted monthly values   

COMMENT: SWS SWF HF Communications Warning 56 was issued on 18 
July and is current for 18-21 Jul. Maximum usable frequencies 
(MUFs) on UT day 18-Jul were near monthly predicted values, with 
mild enhancements observed at most Australian sites. Sporadic 
E was observed in the Cocos Islands and Brisbane. MUFs are expected 
to be near monthly predicted values over 19-21 Jul, with mildly 
degraded HF conditions possible for southern Australian regions 
from late 19-Jul due to the anticipated impact of a CME first 
observed on 15-Jul. 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.

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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