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Title: Convective collapse and overstable oscillations in solar flux tubes
Authors: Hasan, S. S
Keywords: Convection;Solar flux;Solar magnetic field;Magnetic flux;Magnetohydrodynamic flow;Oscillating flow
Issue Date: Nov-1984
Publisher: European Space Egency
Citation: Proceedings of the Fourth European Meeting on Solar Physics - ' The Hydromagnetics of the Sun ' - Noordwijkerhout, The Netherlands, 1 - 3 October 1984, (ESA SP-220, November, 1984), pp. 227 - 228
Abstract: The collapse of solar flux tubes by a convective instability is investigated. At the initial epoch it is assumed that the flux tube is in hydrostatic equilibrium and that it has the same temperature as the ambient medium. The superadiabatic stratification in the tube drives a convective instability. If the initial equilibrium is perturbed by the introduction of a small downflow in the tube, convective collapse occurs leading to magnetic field intensification. The final state consists of overstable oscillations with periods typically around 1000 sec. It is found that the surface magnetic field is in the observed 1 to 2 kG range. There is an oscillating flow (unidirectional at any instant) with an amplitude 1 to 2 km/sec and an average value around 0.
Appears in Collections:IIAP Publications

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