[Ips-dhfpr] SWS Daily HF Prop Report - 09 December 18 issued 2330 UT on 09 Dec 2018 [SEC=UNCLASSIFIED]

Regional Warning Centre rwc at ips.gov.au
Mon Dec 10 10:30:20 EST 2018


SUBJ: SWS DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/09 DECEMBER 2018 BY Space Weather Services
FROM THE AUSTRALIAN SPACE FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (09 DECEMBER) 
Date   T index  Conditions    
09 Dec   -46    Normal-fair    

Flares: none.

MUFs:
   Cocos Island Region:
      No data available.
   Niue Island Region:
      Depressed by 15% during local day.
      Depressed by 15% during local night.
   Northern Australian Region:
      Depressed by 15% during local day.
      Depressed by 20% during local night.
   Southern Australian Region:
      Depressed by 15% during local day.
      Depressed by 15% 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 (10 DECEMBER - 12 DECEMBER)
Date   T index  Conditions       MUFs                              
10 Dec   -35    Normal-fair      Depressed 20%/near predicted 
                                 monthly values
11 Dec   -40    Normal-fair      Depressed 25%/near predicted 
                                 monthly values    
12 Dec   -35    Normal-fair      Depressed 20%/near predicted 
                                 monthly values   

COMMENT: SWS HF Communications Warning 24 was issued on 9 December 
and is current for 10 Dec only. On UT day 9 December, 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 as compared to the 
monthly predicted levels. Sporadic E layers were seen across 
the Australian region and in Antarctica. Depressions are expected 
to continue on 10-12 December as a consequence of the continued 
very low levels of ionising radiation from the Sun and recent 
increase in geomagnetic activity.

----------------------------------------------------------
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
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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