Quasilinear diffusion rates of cometary ions

Details Quasilinear diffusion rates of cometary ions Quasilinear diffusion rates of cometary ions

Aug 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991phflb...3.2124y&link_type=abstract

Physics of Fluids B (ISSN 0899-8221), vol. 3, no. 8, pt. 1, Aug. 1991, p. 2124-2132.

Statistics

Computation

2

Comets, Computational Astrophysics, Diffusion Coefficient, Ionic Diffusion, Kinetic Equations, Method Of Moments, Self Consistent Fields

Scientific paper

The freshly created ions in the upstream region of the cometary bow shock usually form a ring-beam velocity distribution in the solar wind frame of reference. In the present work, the detailed properties of the initial diffusion rates associated with the cometary newborn ions are studied for various physical parameters including the so-called injection angle alpha (that is, the average initial pitch angle associated with the ions) ranging from 0 deg (pure beam distribution) to 90 deg (pure ring distribution). It is shown that initial diffusion rates are strongly dependent upon the angle alpha, such that for alpha = 0-60 deg (quasi-parallel regime) the pitch angle diffusion rate remains relatively small, while for alpha = 60-90 deg (quasi-perpendicular regime) the diffusion rate increases substantially.

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