The interchange instability of stellar magnetic flux tubes

Details The interchange instability of stellar magnetic flux tubes The interchange instability of stellar magnetic flux tubes

Apr 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...271..167b&link_type=abstract

Astronomy and Astrophysics, Vol. 271, p. 167 (1993)

Astronomy and Astrophysics

Astrophysics

11

Stars: Magnetic Fields, Mhd, Instabilities, Stars: Atmospheres, Stars: Late-Type

Scientific paper

We investigate the stability of magnetic flux tubes in the surface layers of late-type stars, concentrating on the interchange (fluting) instability. Flux tubes on low gravity stars (log g ≲ 3.5) are generally unaffected by this instability. On stars with higher surface gravity, tubes are stable if their magnetic flux exceeds 1019 - 1021 Mx (the precise value depending on Teff and log g). Smaller structures on these stars may be stabilized by a sufficient external whirl flow. The magnitude of the required whirl flow shows only weak dependence on Teff but increases sharply with log g. In some stars, the whirl velocities needed for stabilization are larger than extant photo spheric velocities. In these cases, stable tubes are possibly separated into two regimes of permitted fluxes. Consequences for the field structure on the surfaces of late-type stars are discussed.

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