Ionosphere-exosphere coupling through charge exchange and momentum transfer in hydrogen-proton collisions

Details Ionosphere-exosphere coupling through charge exchange and momentum transfer in hydrogen-proton collisions Ionosphere-exosphere coupling through charge exchange and momentum transfer in hydrogen-proton collisions

May 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....96.7697h&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 96, May 1, 1991, p. 7697-7708.

Statistics

Computation

40

Atomic Collisions, Charge Exchange, Exosphere, Hydrogen Atoms, Planetary Ionospheres, Proton Scattering, Elastic Scattering, Hydrogen Ions, Momentum Transfer, Scattering Cross Sections

Scientific paper

The implications of a traditional assumption of exospheric physics, that collisions of hydrogen atoms and protons preferentially result in charge exchange with negligible momentum transfer are examined. Initially adopted as a necessary convenience to accommodate limited computer resources in exosphere model calculations, this approximation results in a direct transformation of the proton velocity distribution into a hot component of neutral hydrogen. With expanding computational facilities, the need for the approximation has passed. As the first step toward its replacement with a realistic, quantum mechanical model of the H - H(+) collision process, differential and cumulative cross sections were calculated for quantum elastic scattering of indistinguishable nuclei for a fine grid of encounter energies and scattering angles. These data are used to study the nature of ionosphere-exosphere coupling through H - H(+) collisions, and to demonstrate that the distribution of velocities of scattered H produced in the traditional exospheric charge exchange approximation, as well as that arising from an alternative, fluid dynamic approach, leads to unacceptable abundances of coronal atoms in long-term, highly elliptic trajectories.

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