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Geometric properties of acoustic waves generated by a point source in the solar-like interior: Effects of acoustic cutoff frequency

Zharkov, S.

Authors



Abstract

Acoustic waves generated by a point source in stratified plasma are considered in this paper. An analytical parametric solution for a monochromatic source is derived for the plane-parallel polytrope model of the solar interior. The solution is used to gain insight into the properties of the generated wavefront as a function of excitation frequency and depth. A slowly varying pressure perturbation moving in upper layers of solar photosphere with supersonic speed is also considered. It is shown to excite acoustic waves putting certain restrictions upon their geometry of the generated wavefront. The results are discussed in relation to flare-generated sunquakes. © 2013 The Author Published by Oxford University Press on behalf of the Royal Astronomical Society.

Journal Article Type Article
Publication Date Jun 1, 2013
Journal Monthly notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Oxford University Press (OUP)
Peer Reviewed Peer Reviewed
Volume 431
Issue 4
Pages 3414-3428
APA6 Citation Zharkov, S. (2013). Geometric properties of acoustic waves generated by a point source in the solar-like interior: Effects of acoustic cutoff frequency. Monthly notices, containing papers, abstracts of papers, and reports of the proceedings of the Society, 431(4), 3414-3428. https://doi.org/10.1093/mnras/stt420
DOI https://doi.org/10.1093/mnras/stt420
Keywords Space and Planetary Science; Astronomy and Astrophysics
Publisher URL https://academic.oup.com/mnras/article/431/4/3414/1151682
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