The interchange instability of small flux tubes

Details The interchange instability of small flux tubes The interchange instability of small flux tubes

Nov 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...140..453s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 140, no. 2, Nov. 1984, p. 453-458.

Physics

40

Magnetic Flux, Magnetohydrodynamic Stability, Solar Magnetic Field, Solar Physics, Flow Velocity, Rotating Fluids, Steady State, Velocity Distribution

Scientific paper

The effect of stationary velocity fields on the interchange (fluting) instability of magnetic flux tubes is investigated theoretically. It is shown through a series of calculations that converging convective cells and internal flows along the fieldlines cannot stabilize but instead can lead to a slightly destabilizing contribution. A small flux tube (magnetic element) is found to be stable if it is surrounded by a whirl which forms in a narrow intergranular down draft. Estimates for the case of the sun (with an assumed whirl velocity of 2 km/s) yield stable tubes in between the unstable tubes with magnetic fluxes of more than 5-10 x 10 to the 17th mx when stabilized by the centrifugal force of the whirl, and more than 2-6 x 10 to the 19th mx when stabilized for buoyancy. Some of the implications of the estimates for current models of the solar surface magnetic fields are discussed.

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