Journal Article

Reflection and conversion of magnetogravity waves in the solar chromosphere: windows to the upper atmosphere

Marie E. Newington and Paul S. Cally

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 402, issue 1, pages 386-394
Published in print February 2010 | ISSN: 0035-8711
Published online February 2010 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2009.15884.x
Reflection and conversion of magnetogravity waves in the solar chromosphere: windows to the upper atmosphere

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The detection of upward propagating internal gravity waves at the base of the Sun's chromosphere has recently been reported by Straus et al., who postulated that these may efficiently couple to Alfvén waves in magnetic regions. This may be important in transporting energy to higher levels. Here we explore the propagation, reflection and mode conversion of linear gravity waves in a model atmosphere and find that even weak magnetic fields usually reflect gravity waves back downwards as slow magnetoacoustic waves well before they reach the Alfvén/acoustic equipartition height at which mode conversion might occur. However, for certain highly inclined magnetic field orientations in which the gravity waves manage to penetrate near or through the equipartition level, there can be substantial conversion to either or both up-going Alfvén and acoustic waves. Wave-energy fluxes comparable to the chromospheric radiative losses are expected.

Keywords: Sun: atmospheric motions; Sun: magnetic fields

Journal Article.  5830 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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