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Acoustic oscillations in solar and stellar flaring loops

Nakariakov, VM, Tsiklauri, D, Kelly, A, Arber, TD and Aschwanden, MJ 2004, 'Acoustic oscillations in solar and stellar flaring loops' , Astronomy and Astrophysics, 414 (2) , L25-L28.

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    Evolution of a coronal loop in response to an impulsive energy release is numerically modelled. It is shown that the loop density evolution curves exhibit quasi-periodic perturbations with the periods given approximately by the ratio of the loop length to the average sound speed, associated with the second standing harmonics of an acoustic wave. The density perturbations have a maximum near the loop apex. The corresponding field-aligned flows have a node near the apex. We suggest that the quasi-periodic pulsations with periods in the range 10-300 s, frequently observed in flaring coronal loops in the radio, visible light and X-ray bands, may be produced by the second standing harmonic of the acoustic mode.

    Item Type: Article
    Uncontrolled Keywords: Sun: flares, oscillations, corona, stars: flare, oscillations, coronae
    Themes: Subjects / Themes > Q Science > QB Astronomy
    Subjects outside of the University Themes
    Schools: Colleges and Schools > College of Science & Technology
    Colleges and Schools > College of Science & Technology > School of Computing, Science and Engineering
    Journal or Publication Title: Astronomy and Astrophysics
    Publisher: EDP Sciences
    Refereed: Yes
    ISSN: 00046361
    Related URLs:
    Depositing User: H Kenna
    Date Deposited: 03 Sep 2007 15:20
    Last Modified: 20 Aug 2013 16:47

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