Flux Retraction and Recycling: Negative Buoyancy--induced Oscillations as an Alternative to Parker's Thermal Relaxation Oscillations

Details Flux Retraction and Recycling: Negative Buoyancy--induced Oscillations as an Alternative to Parker's Thermal Relaxation Oscillations Flux Retraction and Recycling: Negative Buoyancy--induced Oscillations as an Alternative to Parker's Thermal Relaxation Oscillations

Jul 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...448..459d&link_type=abstract

Astrophysical Journal v.448, p.459

Astronomy and Astrophysics

Astronomy

4

Magnetohydrodynamics: Mhd, Sun: Magnetic Fields, Sun: Sunspots

Scientific paper

Observations show that magnetically active regions on the Sun cluster together as activity complexes. They are maintained at an almost constant flux level by recurring flux emergences accompanied by local disappearance of flux, and the in situ flux disappearance shows evidence of flux retraction. Parker (1987a, b) suggested thermal shadows to act as dynamical barriers, suppressing magnetic buoyancy in the lower convection zone (CZ), and intermittently letting flux emerge through a thermal relaxation oscillation, which could explain the recurrent flux injection into these activity complexes. We suggest negative buoyancy (Vainshtein & Levy 1991) to account for flux retraction and its subsequent recycling. Flux tubes can cool and become heavier than their surroundings. The negatively buoyant flux tube can fall through the CZ, hit the top of the stable radiative zone where it has to encounter a rapidly rising Brunt-Väisälä frequency N, and bounce back to the surface in an oscillatory fashion. The oscillation can be damped by dissipative processes such as viscosity, the tube can be fragmented by instabilities, or the rising flux tube can grab flux from the overshoot region when it reemerges; overall, the negative buoyancy-induced oscillation could retract flux, recycle it, and explain the recurrent flux injection and in situ flux disappearance observed in activity complexes.

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