The Role of Pickup Ions in the Solar Wind Interaction with Venus as Deduced from Observations and Numerical Simulations.

Details The Role of Pickup Ions in the Solar Wind Interaction with Venus as Deduced from Observations and Numerical Simulations. The Role of Pickup Ions in the Solar Wind Interaction with Venus as Deduced from Observations and Numerical Simulations.

Jan 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990phdt........88m&link_type=abstract

Thesis (PH.D.)--UNIVERSITY OF CALIFORNIA, LOS ANGELES, 1990.Source: Dissertation Abstracts International, Volume: 51-10, Sectio

Computer Science

Scientific paper

Venus is essentially unmagnetized. The ionosphere acts as an obstacle to the solar wind. Ions produced from the neutral atmosphere above the ionosphere are picked up by the solar wind. The effects of these pickup ions on the Venus-solar wind interaction are deduced from observations and numerical simulations. Average distant magnetotail ion and magnetic field properties are deduced from a statistical survey of Pioneer Venus magnetometer and plasma analyzer data. A global gasdynamic model of the interaction that includes pickup ion effects consistent with photoionization of the hot oxygen corona produces tail properties consistent with observations. Results of a hybrid numerical model of the entire dayside interaction, with pickup ions treated self-consistently, are compared to gasdynamic model dayside results and to observations. The mass loaded gasdynamic model is generally appropriate in the magnetosheath, but suffers from significant inaccuracies in quasi-parallel shock regions and in the dayside magnetic barrier. Pickup ions produced by hot oxygen corona photoionization appear to have a small effect on the bow shock and magnetic barrier but produce important effects in the distant magnetotail. The planetary ion observation rate varies with the solar EUV flux over the solar cycle, indicating that photoionization of the neutral oxygen corona is a major source of pickup ions at Venus. The steady state escape flux of oxygen ions is estimated to be the order of 10^ {24} s^{-1}.

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