Preshock region acceleration of implanted cometary H(+) and O(+)

Details Preshock region acceleration of implanted cometary H(+) and O(+) Preshock region acceleration of implanted cometary H(+) and O(+)

Jan 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jgr....93...35g&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 93, Jan. 1, 1988, p. 35-47.

Physics

45

Cometary Atmospheres, Hydrogen Ions, Ion Implantation, Magnetohydrodynamic Turbulence, Oxygen Ions, Pitch (Inclination), Charge Exchange, Energetic Particles, Halley'S Comet, Shock Waves, Solar System, Solar Wind, Comets, Shock, Accleration, Ions, Implantation, Magnetohydrodynamics, Turbulence, Scattering, Distribution, Pitch Angle, Plasma, Flow, Oxygen, Hydrogen, Upstream Region, Solar Wind, Evolution, Transport, Photoionization, Charge, Models, Halley, Theoretical Studies, Spectra, Spacecraft Observations

Scientific paper

A self-consistent, three-fluid model of plasma transport and implanted ion acceleration in the unshocked solar wind is presented. The solar wind plasma is depleted by charge exchange with the expanding cometary exosphere, while implanted protons and heavy ions are produced by photoionization and charge transfer and lost by charge exchange. A generalized transport equation describing convection, adiabatic and diffusive velocity change, and the appropriate production terms is used to describe the evolution of the two cometary ion components, while the moments of the Boltzmann equation are used to calculate the solar wind density and pressure. The flow velocity is obtained self-consistently by combining the conservation equations of the three ion species. The results imply that second-order Fermi acceleration can explain the implanted spectra observed in the unshocked solar wind. Comparison of measured and calculated distribution indicates that spatial diffusion of implanted ions probably plays an important role in forming the energetic particle environment in the shock vicinity.

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