On the formation of coronal cavities

Details On the formation of coronal cavities On the formation of coronal cavities

Apr 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986sfcp.rept..268a&link_type=abstract

In its Solar Flares and Coronal Physics Using P/OF as a Research Tool p 268-273 (SEE N86-24614 14-92)

Physics

Cavities, Chromosphere, Coronal Holes, Magnetic Fields, Solar Corona, Solar Prominences, Computerized Simulation, Magnetohydrodynamics, Spicules

Scientific paper

A theoretical study of the formation of a coronal cavity and its relation to a quiescent prominence is presented. It is argued that the formation of a cavity is initiated by the condensation of plasma which is trapped by the coronal magnetic field in a closed streamer and which then flows down to the chromosphere along the field lines due to lack of stable magnetic support against gravity. The existence of a coronal cavity depends on the coronal magnetic field strength; with low strength, the plasma density is not high enough for condensation to occur. Furthermore, we suggest that prominence and cavity material is supplied from the chromospheric level. Whether a coronal cavity and a prominence coexist depends on the magnetic field configuration; a prominence requires stable magnetic support.

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