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Title: A time dependent model for spicule flow
Authors: Hasan, S. S
Venkatakrishnan, P
Keywords: Magnetohydrodynamic Flow;Magnetoplasmadynamics;Solar Magnetic Field;Solar Prominences;Spicules;Stellar Models;Compressible Flow;Flow Velocity;Magnetic Field Configurations;Magnetic Flux;Plasma Sheaths;Pressure Distribution;Time Dependence;Two Dimensional Flow;Velocity Distribution
Issue Date: Sep-1981
Publisher: Kluwer Academic Publishers
Citation: Solar Physics, Vol. 73, No. 1, pp. 45 - 57
Abstract: A time dependent model for the flow of gas in a spicule is studied. In this model, the flow occurs in a magnetic flux sheath. Starting from hydrostatic equilibrium, the flux sheath is allowed to collapse normal to itself. The collapse induces a flow of gas along the magnetic field and this flow is identified as a spicule. A variety of sheath geometries and velocity patterns for the normal flow have been studied. It is observed that a large curvature in the field geometry and a large initial value for the normal flow are necessary to achieve spicule-like velocities. The duration for which a large velocity of normal flow is required is much shorter than the average lifetime of a spicule. It is proposed that the initial rapid collapse occurs during an 'impulsive spicule' phase and it is the subsequent gradual relaxation of the flow which is observed as a spicule.
ISSN: 0038-0938
Appears in Collections:IIAP Publications

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