A magnetohydrodynamic theory of coronal loop transients

Physics

Scientific paper

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Buoyancy, Coronal Loops, Dynamic Models, Ejecta, Magnetohydrodynamics, Centrifugal Force, Coronagraphs, Force Distribution, Magnetic Flux, Magnetic Induction, Solar Magnetic Field, Solar Wind, Thermal Stresses

Scientific paper

The physical and geometrical characteristics of solar coronal loop transients are described in an MHD model based on Archimedes' MHD buoyancy force. The theory was developed from interpretation of coronagraphic data, particularly from Skylab. The brightness of a loop is taken to indicate the electron density, and successive pictures reveal the electron enhancement in different columns. The forces which lift the loop off the sun surface are analyzed as an MHD buoyancy force affecting every mass element by imparting an inertial force necessary for heliocentrifugal motion. Thermal forces are responsible for transferring the ambient stress to the interior of the loop to begin the process. The kinematic and hydrostatic buoyancy overcome the gravitational force, and a flux rope can then curve upward, spiralling like a corkscrew with varying cross section around the unwinding solar magnetic field lines.

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