✦ LIBER ✦

A new resonance in the solar atmosphere

✍ Scribed by Joseph V. Hollweg

Publisher: Springer
Year: 1979
Tongue: English
Weight: 705 KB
Volume: 62
Category: Article
ISSN: 0038-0938
DOI: 10.1007/bf00155355

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✦ Synopsis

We consider a horizontally stratified isothermal model of the solar atmosphere, with vertical and uniform Bo, and v~ >> v]. The equations of motion are linearized about a background which is in hydrostatic equilibrium. A homogeneous wave equation results for the motions perpendicular to Bo; this wave equation is similar to the equation for the MHD fast mode. On the other hand, the equation for the parallel motions is inhomogeneous, containing 'driving terms' which arise from the presence of the fast mode; the homogeneous form of this equation is identical to the equation describing verticallypropagating gravity-modified acoustic waves. We demonstrate that a resonance can exist between the (driving) fast wave and the (driven) gravity-modified acoustic wave, in such a way that very large parallel velocities can be driven by small perpendicular velocities. Applications of this resonance to solar spicules, 'jets', and other phenomena are discussed.

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