[Ips-dhfpr] SWS Daily HF Prop Report - 04 December 18 issued 2330 UT on 04 Dec 2018 [SEC=UNCLASSIFIED]

[Regional Warning Centre]

SUBJ: SWS DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/04 DECEMBER 2018 BY Space Weather Services
FROM THE AUSTRALIAN SPACE FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (04 DECEMBER) 
Date   T index  Conditions    
04 Dec   -38    Normal-fair    

Flares: none.

MUFs:
   Cocos Island Region:
      No data available during local day.
      No data available during local night.
   Niue Island Region:
      Depressed by 20% during local day.
      Near predicted monthly values during local night.
   Northern Australian Region:
      Depressed by 20% during local day.
      Depressed by 35% during local night.
   Southern Australian Region:
      Depressed by 15% during local day.
      Near predicted monthly values during local night.
   Antarctic Region (Casey/Scott Base/Davis/Mawson):
      Depressed by 15% over the UT day.

PCA Event : No event.

Monthly T index:
Month  T index
Nov      -32
Dec      -8
Jan      -9


2. FORECAST (05 DECEMBER - 07 DECEMBER)
Date   T index  Conditions       MUFs                              
05 Dec   -35    Normal-fair      Depressed 30%/near predicted 
                                 monthly values
06 Dec   -40    Normal-fair      15 to 35% below predicted monthly 
                                 values    
07 Dec   -40    Normal-fair      15 to 35% below predicted monthly 
                                 values   

COMMENT: SWS HF Communications Warning 21 was issued on 4 December 
and is current for 5 Dec only. Due to very low levels of ionising 
radiation from the Sun, MUF depressions of 15 to 35% were observed 
across the Australian region and in Antarctica on UT day 4 December. 
Sporadic E layers were seen across the Australian region and 
in Antarctica. Similar levels of MUF depressions in the Australian 
region are expected to continue on UT day 5 December. Stronger 
depressions are likely if the CME observed on 30 November will 
arrive and this will result in a significant increase in 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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