An Accurate Structure of Alfven Soliton Formed by Modulational Interaction of the Lower Hybrid Waves With a Kinetic Alfven Mode

Details An Accurate Structure of Alfven Soliton Formed by Modulational Interaction of the Lower Hybrid Waves With a Kinetic Alfven Mode An Accurate Structure of Alfven Soliton Formed by Modulational Interaction of the Lower Hybrid Waves With a Kinetic Alfven Mode

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm51b0827s&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SM51B-0827

Physics

2407 Auroral Ionosphere (2704), 2704 Auroral Phenomena (2407), 7839 Nonlinear Phenomena

Scientific paper

Auroral observations show strong correlation between localized lower hybrid waves (LHW) and the kinetic Alfven waves (KAW). We propose a model in which the observed localization of LHW is produced by their modulational interaction with KAW. The small density variations associated with KAW act as the potential well for LHW leading to modulation of their intensity. With the intensity modulation of LHW the Reynolds stresses are exerted on plasma leading to formation of dypolar vortex structures in plasma density. In nonlinear evolution of the modulational interaction the two dimensional soliton is formed, in which LHW are trapped. The soliton travels along magnetic field with Alfven speed and has a cross field localized structure with a typical size of the order of electron skin depth (on the order of 100 m in the auroral conditions). The exact cross field form of the solitary structure is found by numerical solution of the fourth order differential equation for LH potential. Results of calculations are compared with observations.

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