Resonant energy conversion of 3-min intensity oscillations into Alfvén waves in the solar atmosphere

David Kuridze, T. V. Zaqarashvili

Research output: Contribution to journalArticlepeer-review

3 Citations (SciVal)

Abstract

Nonlinear coupling between 3-min oscillations and Alfvén waves in the solar lower atmosphere is studied. Three-minute oscillations are considered as acoustic waves trapped in a chromospheric cavity and oscillating along transversally inhomogeneous vertical magnetic field. It is shown that under the action of the oscillations the temporal dynamics of Alfvén waves is governed by Mathieu equation. Consequently, the harmonics of Alfvén waves with twice period and wavelength of 3-min oscillations grow exponentially in time near the layer where the sound and Alfvén speeds equal i.e. . Thus the 3-min oscillations are resonantly absorbed by pure Alfvén waves near this resonant layer. The resonant Alfvén waves may penetrate into the solar corona taking energy from the chromosphere. Therefore the layer may play a role of energy channel for otherwise trapped acoustic oscillations.
Original languageEnglish
Pages (from-to)351-355
Number of pages5
JournalJournal of Atmospheric and Solar-Terrestrial Physics
Volume70
Issue number2-4
Early online date05 Oct 2007
DOIs
Publication statusPublished - 01 Feb 2008

Keywords

  • solar atmosphere
  • magnetohydrodynamic waves
  • 3-min oscillation

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