Alfvén waves in the structured solar corona

Research output: Contribution to journalArticleResearchpeer-review

10 Citations (Scopus)

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

Cite this

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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 Alfv{\'e}n 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 Alfv{\'e}n waves. The processes of mode conversion/resonant absorption and Alfv{\'e}n 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.",
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Alfvén waves in the structured solar corona. / Cally, Paul S.

In: Monthly Notices of the Royal Astronomical Society, Vol. 466, No. 1, 2017, p. 413-424.

Research output: Contribution to journalArticleResearchpeer-review

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KW - Sun: helioseismology

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