Physics
Scientific paper
Apr 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....96.5469y&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 96, April 1, 1991, p. 5469-5478. CNPq-supported research.
Physics
12
Comets, Ions, Diffusion, Theoretical Studies, Dynamics, Analysis, Numerical Methods, Distribution, Resonance, Parameters, Density, Calculations, Models, Hydromagnetic Waves, Frequencies, Velocity, Upstream, Gaps, Concentration, Particles, Timescale
Scientific paper
A self-consistent analysis of pitch angle diffusion of newborn ions by low-frequency hydromagnetic waves predominantly propagating in one direction has been carried out. It is found that in the wave frame defined in velocity space the time evolution of an ion distribution can be described as undergoing purely pitch angle diffusion. The role of the resonant versus nonresonant diffusion is discussed in detail, and it is shown that a time-asymptotic distribution of a particular form develops. It is analytically and numerically shown that the self-consistent diffusion process leads to a time-asymptotic partial shell distributions. The relevance of this finding to observations that the ion distributions in the far upstream of cometary bow shocks have a partial shell structure rather than a complete shell is pointed out.
Wu Shang-Chen
Yoon Peter H.
Ziebell L. F.
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