Distribution function of continuously created newborn and pickup ions in outer cometary exospheres

Details Distribution function of continuously created newborn and pickup ions in outer cometary exospheres Distribution function of continuously created newborn and pickup ions in outer cometary exospheres

Jul 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jgr....94.8685g&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 94, July 1, 1989, p. 8685-8692.

Physics

16

Cometary Atmospheres, Gas Ionization, Ion Distribution, Particle Production, Solar Wind, Asymptotic Methods, Distribution Functions, Sublethal Dosage, Comets, Pickup, Ions, Exosphere, Evolution, Distribution, Turbulence, Formation, Origin, Stability, Models, Time Dependency, Numerical Methods, Calculations, Ionization, Parameters, Hydromagnetic Waves, Solar Wind, Theoretical Studies

Scientific paper

The time evolution of the distribution function of newborn ions in the solar wind is investigated using a quasi-linear-type diffusion equation. The initial distribution is taken to be a ring beam, which is approximated by delta function in pitch angle and velocity, and it is assumed that the ions are created at a constant rate with a similar distribution. A long-time asymptotic form of ion distribution is obtained, which is a mixture of newborn ions and ions generated throughout the entire process. It is shown that the time asymptotic distribution function exists even in the presence of a continuous ionization process. The stability of the long-time asymptotic distribution was examined for the case of parallel propagation, and the results show that the distribution function can be unstable to low-frequency hydromagnetic waves. The results of the analysis were found to agree with recent satellite observations.

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