[Ips-dhfpr] SWS Daily HF Prop Report - 08 December 18 issued 2330 UT on 08 Dec 2018 [SEC=UNCLASSIFIED]

[Regional Warning Centre]

SUBJ: SWS DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/08 DECEMBER 2018 BY Space Weather Services
FROM THE AUSTRALIAN SPACE FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (08 DECEMBER) 
Date   T index  Conditions    
08 Dec   -35    Normal         

Flares: none.

MUFs:
   Cocos Island Region:
      No data available.
   Niue Island Region:
      Near predicted monthly values during local day.
      Depressed by 15% during local night.
   Northern Australian Region:
      Near predicted monthly values.
   Southern Australian Region:
      Depressed by 25% during local day.
      Depressed by 15% during local night.
      Depressed by 20% after local dawn.
   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 (09 DECEMBER - 11 DECEMBER)
Date   T index  Conditions       MUFs                              
09 Dec   -40    Normal           15 to 20% below predicted monthly 
                                 values
10 Dec   -35    Normal           Depressed 15%/near predicted 
                                 monthly values    
11 Dec   -30    Normal           Depressed 15%/near predicted 
                                 monthly values   

COMMENT: SWS HF Communications Warning 23 was issued on 7 December 
and is current for 8-9 Dec. A combination of very low levels 
of ionising radiation from the Sun and geomagnetic disturbance 
associated with the coronal hole caused significant MUF depressions 
across the Australian region compared to the monthly predicted 
levels on UT day 8 December. Sporadic E layers were seen across 
the Australian region. Depressions are expected to continue on 
9-10 December as a consequence of the continued very low levels 
of ionising radiation from the Sun and geomagnetic activity.

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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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