Alfvén Instability in Coronal Loops With Siphon Flows

Details Alfvén Instability in Coronal Loops With Siphon Flows Alfvén Instability in Coronal Loops With Siphon Flows

Publishing date

Mar 2009

URL

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009apj...694...69t&link_type=abstract

Journals

The Astrophysical Journal, Volume 694, Issue 1, pp. 69-75 (2009).

Science

Astronomy and Astrophysics

Field

Astronomy

Additional info 2

6

Additional info 3

Instabilities, Mhd, Sun: Atmosphere

Type

Scientific paper

Abstract

A new magnetohydrodynamic (MHD) instability in coronal loops is presented. It is demonstrated that small-amplitude torsional Alfvénic disturbances generated by random photospheric motions are inevitably amplified in asymmetrically stratified loops with siphon flows. The loop asymmetry and the flow speeds can be arbitrarily small. The growth rates linked with the instability increase with increasing flow speeds. The instability is caused by over-reflection of Alfvén waves at the transition region where steep variations in density exist.

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