Alfvén waves in the structured solar corona

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Abstract

A simple model of a periodic ensemble of closely packed flux tubes, sitting atop a vertically stratified layer, reveals that an incident fast wave from below preferentially converts almost immediately to Alfvén waves in the flux tubes, with kink waves restricted to at most a very few Fourier modes. This suggests that observations of coronal kink modes in such structured systems may greatly underestimate the netwave-energy flux being transported into and through the corona, much of which may reside in harder-to-observe Alfvén waves. The processes of mode conversion/resonant absorption and Alfvén phase mixing are implicated. It is suggested that the Sun's internal p-mode field - the 5-min oscillations - may contribute substantially to the process by supplying incident fastwaves in the chromosphere that scatter and mode-convert in the tube ensemble.

Original languageEnglish
Pages (from-to)413-424
Number of pages12
JournalMonthly Notices of the Royal Astronomical Society
Volume466
Issue number1
DOIs
Publication statusPublished - 2017

Keywords

  • Sun: helioseismology
  • Sun: magnetic fields
  • Sun: oscillations
  • Sun: corona

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