Physics
Scientific paper
Sep 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989soph..124..251y&link_type=abstract
Solar Physics (ISSN 0038-0938), vol. 124, no. 2, 1989, p. 251-269.
Physics
3
Coronal Loops, Dynamic Models, Solar Prominences, Magnetic Field Configurations, Magnetohydrodynamics, Polarized Radiation, Pressure Gradients, Solar Atmosphere, Solar Magnetic Field
Scientific paper
A dynamical model of prominence loops is constructed on the basis of the theory of hydromagnetic buoyancy force. A prominence loop is regarded as a flux rope immersed in the solar atmosphere above a bipolar region of the photospheric magnetic field. The motion of a loop is partitioned into a translational motion, which accounts for the displacement of the centroidal axis of the loop, and an expansional motion, which accounts for the displacement of the periphery of the loop relative to the axis. The main constituent of the hydromagnetic buoyancy force on a prominence loop is the diamagnetic force exerted on the internal currents by the external currents that sustain the pre-existing magnetic field. For a prominence loop in equilibrium, the gravitational force is balanced by the hydromagnetic buoyancy force and the Lorentz force of helical magnetic field is balanced by a gradient force of gas pressure.
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