Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...106...58s&link_type=abstract
Astronomy and Astrophysics, vol. 106, no. 1, Feb. 1982, p. 58-66. Research supported by the Nederlandse Organisatie voor Zuiver
Astronomy and Astrophysics
Astrophysics
156
Adiabatic Conditions, Magnetic Flux, Main Sequence Stars, Stellar Magnetic Fields, Systems Stability, Toroids, Convection, Solar Cycles, Stellar Envelopes
Scientific paper
A thin tube approximation is used to study the stability of a magnetic flux tube in the equatorial plane of a star, where (1) only adiabatic disturbances are considered, (2) the tubes are unstable to poleward motion and to (3) poleward motions within the equatorial plane, if the superadiabaticity of the stratification is large enough. While the curvature of the tube in a spherical geometry has a stabilizing effect, it is not strong enough to stabilize flux tubes in the convective envelopes of main sequence stars. The longer wavelengths are favored by the instability and, for the case of the sun, modes m equals 0-4 are unstable. It is suggested in view of this instability that toroidal fields, in a stellar dynamo, occur at the interface between convection zone and radiative interior rather than within the convection zone.
Spruit Hendrik C.
van Ballegooijen Adriaan A.
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