[Ips-dhfpr] SWS Daily HF Prop Report - 27 December 18 issued 2335 UT on 27 Dec 2018 [SEC=UNCLASSIFIED]

[rwc]

SUBJ: SWS DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/27 DECEMBER 2018 BY Space Weather Services
FROM THE AUSTRALIAN SPACE FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (27 DECEMBER) 
Date   T index  Conditions    
27 Dec   -39    Normal-fair    

Flares: none.

MUFs:
   Cocos Island Region:
      No data available.
   Niue Island Region:
      Near predicted monthly values during local day.
      Depressed by 40% during local night.
   Northern Australian Region:
      Depressed by 20% during local day.
      Depressed by 30% during local night.
      Depressed by 20% after local dawn.
   Southern Australian Region:
      Near predicted monthly values during local day.
      Depressed 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
Nov      -32
Dec      -8
Jan      -9


2. FORECAST (28 DECEMBER - 30 DECEMBER)
Date   T index  Conditions       MUFs                              
28 Dec   -40    Normal-fair      10 to 30% below predicted monthly 
                                 values
29 Dec   -40    Normal-fair      10 to 30% below predicted monthly 
                                 values    
30 Dec   -40    Normal-fair      10 to 30% below predicted monthly 
                                 values   

COMMENT: SWS HF Communications Warning 31 was issued on 26 December 
and is current for 27-29 Dec. Minor to Moderate MUF depressions 
across the Australian region as compared to the monthly predicted 
levels observed during 27 December. Sporadic E layers were seen 
across the Australian region and in Antarctica. Depressed MUFs 
are expected to persist for the next three days, as a consequence 
of very low levels of ionising radiation from the Sun and increased 
geomagnetic activity due to coronal hole effects.

----------------------------------------------------------
For an explanation of some of the terms in this report, go to
http://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
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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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