A time dependent model for spicule flow

Details A time dependent model for spicule flow A time dependent model for spicule flow

Sep 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981soph...73...45h&link_type=abstract

Solar Physics, vol. 73, Sept. 1981, p. 45-57.

Physics

7

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

Scientific paper

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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