Siphon flows in the solar corona

Details Siphon flows in the solar corona Siphon flows in the solar corona

Jan 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981soph...69...63n&link_type=abstract

Solar Physics, vol. 69, Jan. 1981, p. 63-76.

Physics

40

Coronal Loops, Flow Velocity, Plasma Dynamics, Solar Corona, Steady Flow, Hydrogen Plasma, Pressure Gradients, Siphoning, Solar Magnetic Field, Subsonic Flow, Supersonic Flow, Ultraviolet Radiation, Velocity Distribution

Scientific paper

The flows in a coronal magnetic arch associated with a pressure difference between the footpoints are investigated. Steady flows are of different types: always subsonic; subsonic in one branch of the arch, supersonic in the second; subsonic-supersonic with stationary shocks which adjust the flow to the boundary conditions in the second footpoint. The large velocity increase along the loop in subsonic-supersonic flows is associated with the large density decrease. A velocity drop and a density jump occur across the shock. The emission of such arches in coronal lines (Mg X at 625 A and Si XII at 499 A) is calculated. It is suggested that the intensity drop along the axis observed in some UV loops is due to the density drop associated with subsonic-supersonic flows.

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