Flows along penumbral flux tubes in sunspots. Instability of super-Alfvénic, serpentine solutions

Details Flows along penumbral flux tubes in sunspots. Instability of super-Alfvénic, serpentine solutions Flows along penumbral flux tubes in sunspots. Instability of super-Alfvénic, serpentine solutions

Sep 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005a%26a...440l..29t&link_type=abstract

Astronomy and Astrophysics, Volume 440, Issue 2, September III 2005, pp.L29-L32

Astronomy and Astrophysics

Astrophysics

10

Sunspots, Sun: Magnetic Fields, Magnetohydrodynamics (Mhd)

Scientific paper

The super-Alfvénic, undulating "sea-serpent" flow configurations along thin magnetic flux tubes, proposed by Schlichenmaier (2002, Astron. Nachr., 323, 303; 2003, ASP Conf. Ser., 286, 24) to explain both the Evershed flow and moving penumbral grains in a sunspot, are shown to be gravitationally unstable. Any undulations that occur for super-Alfvénic flow speeds will form preferentially in a horizontal plane and hence will not explain Evershed downflows or outward-moving penumbral grains. Sub-Alfvénic, arched flow configurations, on the other hand, are gravitationally stable.

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