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A time dependent model for spicule flow

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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.

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Authors and Affiliations

  1. Indian Institute of Astrophysics, 560 034, Bangalore, India

    S. S. Hasan & P. Venkatakrishnan

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  1. S. S. Hasan
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  2. P. Venkatakrishnan
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Hasan, S.S., Venkatakrishnan, P. A time dependent model for spicule flow. Sol Phys 73, 45–57 (1981). https://doi.org/10.1007/BF00153143

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  • DOI: https://doi.org/10.1007/BF00153143

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