Gravity damping of Alfvén waves: Theory and numerical modeling

Details Gravity damping of Alfvén waves: Theory and numerical modeling Gravity damping of Alfvén waves: Theory and numerical modeling

Jun 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aipc..471..349k&link_type=abstract

The solar wind nine conference. AIP Conference Proceedings, Volume 471, pp. 349-352 (1999).

Physics

Magnetohydrodynamics And Plasmas

Scientific paper

In a collisionless medium where gravity and magnetic field are parallel, a charged particle and an electromagnetic wave can exchange energy and momentum at a rate which is proportional to the gravitational acceleration. As a result, plasma energization can occur. A test particle approach to the problem has demonstrated that the total energy of the particle increases at the rate predicted by the gravity damping mechanism. Moreover, the test particle undergoes significant upward motion in an exponential atmosphere. This indicates that gravity damping can contribute to the solar wind formation in two distinct ways. First, implicitly, through plasma heating: the pressure gradient created in this way is the main driving force of the solar wind in a fluid model. Second, the particle experiences direct lift due to energy exchange with the wave and the up-down asymmetry of collision rates in a stratified atmosphere.

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