Alfvén instability of steady state flux tubes. Isothermal flow

Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

105 Wedi eu Llwytho i Lawr (Pure)


An application of a recently discovered MHD instability to an open magnetic flux tube is investigated. The flux tube is gravitationally stratified and permeated by a smooth subsonic and sub-Alfvenic isothermal flow. The stability of such a tube with respect to small amplitude torsional perturbations generated at the footpoint by random convective motions is analysed. The perturbations are exponentially amplified in time if a narrow region exists where the flux tube rapidly expands. The obtained results may account for the nonthermal broadenings associated with upflows in magnetic regions of the lower solar atmosphere.
Iaith wreiddiolSaesneg
Rhif yr erthyglA68
Nifer y tudalennau9
CyfnodolynAstronomy and Astrophysics
Dynodwyr Gwrthrych Digidol (DOIs)
StatwsCyhoeddwyd - 29 Awst 2011

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