The Damping of Compressional Alfven Waves near Magnetic Cusp Configurations

Details The Damping of Compressional Alfven Waves near Magnetic Cusp Configurations The Damping of Compressional Alfven Waves near Magnetic Cusp Configurations

Dec 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...455..693s&link_type=abstract

Astrophysical Journal v.455, p.693

Astronomy and Astrophysics

Astronomy

4

Magnetohydrodynamics: Mhd, Sun: Corona, Sun: Oscillations, Waves

Scientific paper

The damping of compressional Alfvén waves is studied for magnetic configurations that harbor a cusp, i.e., a three-dimensional magnetic null. The objective is to determine the quality factor Q, the ratio of the oscillation frequency to the damping rate. By a numerical solution of the resistive MHD equations in the cusp geometry, it is established that the Q is of order ln [S], where S is the Lundquist number. The result constitutes a generalization of recent findings that show that the Q for two-dimensional magnetic null configurations is of order ln [S], and suggests extremely efficient conversion of Alfvénic wave energy to heat in magnetic wave configurations incorporating null points. Implications for coronal heating and magnetospheric cusps are discussed.

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