Physics – Plasma Physics
Scientific paper
Jun 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jgr....93.5470g&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 93, June 1, 1988, p. 5470-5486. DOE-supported research.
Physics
Plasma Physics
47
Interplanetary Magnetic Fields, Solar Wind, Bow Waves, Plasma Physics, Plasma Turbulence, Time Dependence
Scientific paper
This paper discusses the process of assimilation (pickup) by the solar wind of newly ionized atoms and molecules. Generally, the pickup process is considered to evolve in three stages: (1) the initial interaction of newly created ions with the interplanetary magnetic field to form the ring-beam distribution; (2) pitch angle scattering of the ring beam to form a hollow shell; and (3) slower velocity diffusion to form a partially filled-in shell distribution. Using numerical simulations of turbulence such as would occur naturally in the solar wind and such as would be encountered near cometary bow shocks, the processes of shell formation and evolution are studied, and the results are used to estimate the time scales for shell formation and diffusion in several situations of recent observational interest, the interstellar He data obtained by AMPTE and cometary ion pickup distributions obtained by various spacecraft at comets Giacobini-Zinner and Halley.
Gaffey John Dean Jr.
Winske Dan
Wu Shang-Chen
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