[Ips-dhfpr] SWS Daily HF Prop Report - 16 December 18 issued 2334 UT on 16 Dec 2018 [SEC=UNCLASSIFIED]

rwc rwc at ips.gov.au
Mon Dec 17 10:34:41 EST 2018


SUBJ: SWS DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/16 DECEMBER 2018 BY Space Weather Services
FROM THE AUSTRALIAN SPACE FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (16 DECEMBER) 
Date   T index  Conditions    
16 Dec   -40    Normal         

Flares: none.

MUFs:
   Cocos Island Region:
      No data available during local day.
      No data available during local night.
   Niue Island Region:
      Depressed by 15% during local day.
      No data available during local night.
   Northern Australian Region:
      Depressed by 15% during local day.
      Depressed by 15% during local night.
   Southern Australian Region:
      Depressed by 20% during local day.
      Depressed by 20% 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 (17 DECEMBER - 19 DECEMBER)
Date   T index  Conditions       MUFs                              
17 Dec   -30    Normal           Depressed 15 to 30%/near predicted 
                                 monthly values
18 Dec   -30    Normal           Depressed 15 to 30%/near predicted 
                                 monthly values    
19 Dec   -30    Normal           Depressed 15 to 30%/near predicted 
                                 monthly values   

COMMENT: SWS HF Communications Warning 28 was issued on 16 December 
and is current for 17 Dec only. On UT day 16 December, there 
were minor to moderate 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. 
Similar conditions are expected for UT day, 17 December, as a 
consequence of the continued very low levels of ionising radiation 
from the Sun. Depressions may lessen on UT day, 18 December, 
in response to possible geomagnetic activity due to an approaching 
coronal hole.

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