Instability Analysis with Measured Particle Distribution Functions

Details Instability Analysis with Measured Particle Distribution Functions Instability Analysis with Measured Particle Distribution Functions

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmsm51a..10d&link_type=abstract

American Geophysical Union, Spring Meeting 2002, abstract #SM51A-10

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2704 Auroral Phenomena (2407), 2772 Plasma Waves And Instabilities

Scientific paper

While instability analysis with model distributions such as a combination of Maxwellians is already well established, with efficient numerical algorithms, analysis of actual velocity distribution functions, as obtained from observations or simulation is far more difficult and requires the development of new algorithms. It is necessary, however, because wave growth in a collisionless plasma is often due to microscopic features which are poorly represented by models. Although simulations are generally started with such model distributions, distributions will nearly always quickly evolve due to quasilinear and nonlinear wave-particle interactions. Growth rates are modified in turn and sometimes even the nature of excited wave modes. An analysis based upon the actual distribution function is also necessary in order to distinguish quasilinear effects from other nonlinear modifications or stabilization of wave growth. In doing so statistical fluctuations of observed distributions (in regions of low count rates) must be handled with some care, in order not to obscure true nonthermal features. As an application of this new code, the dynamics of electron beam driven waves in a magnetized plasma is analyzed using particle distributions from a computer simulation The evolution of the wave spectrum from field aligned Langmuir waves to more and more oblique low frequency (lower hybrid) waves is shown to be largely connected with quasilinear effects. Such an evolution to a highly oblique low frequency wave spectrum is required if auroral electron beams are ultimately also responsible for perpendicular ion heating and ion conic generation.

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