A modified flow/field model of the solar wind interaction with Mars

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dc.contributor.advisorCloutier, Paul A.en_US
dc.creatorStewart, Brian K.en_US
dc.date.accessioned2009-06-04T00:26:37Zen_US
dc.date.available2009-06-04T00:26:37Zen_US
dc.date.issued1992en_US
dc.description.abstractA modified steady state flow/field model is applied to the direct interaction of the solar wind with the Martian ionosphere. The original flow/field model (Cloutier et al., 1987) is a one-dimensional, self-consistent derivation of differentials in vertical velocity, magnetic field, and ion densities from the coupled MHD equations. While successful in reproducing features of the ionosphere of Venus (Cloutier et al., 1987; McGary, 1987) and of Mars (Stewart, 1989), the flow/field model required an independently specified heating term (Q). The requirement of this term implies the presence of an energy source not accounted for in conventional calculations. This source was previously simulated with the inclusion of Q, but an unrecognized momentum or pressure term may also provide the coupling with the solar wind without the need of the free parameter Q. An in-depth analysis of Pioneer Venus data in relation to the total conservation of momentum of the system led to the discovery that the total momentum was in most cases not entirely accounted for, and that this "missing" term was correlated with solar wind dynamic pressure. By including this missing pressure, a new set of differential equations, which were also extended to include horizontal velocity terms, was derived. Extrapolation of the missing pressure to Mars gave results that faithfully reproduced the ionospheric features associated with previous flow/field models while maintaining agreement with Viking 1 and 2 observations. Finally, we suggest that the source of P$\sb{\rm missing}$ could be a population of suprathermal particles within the ionosphere. The missing pressures in the Viking simulations are consistent with measured suprathermal pressures at Mars (Hanson and Mantas, 1988).en_US
dc.format.extent113 p.en_US
dc.format.mimetypeapplication/pdfen_US
dc.identifier.callnoThesis Sp. Sci. 1992 Stewarten_US
dc.identifier.citationStewart, Brian K.. "A modified flow/field model of the solar wind interaction with Mars." (1992) Diss., Rice University. <a href="https://hdl.handle.net/1911/16591">https://hdl.handle.net/1911/16591</a>.en_US
dc.identifier.urihttps://hdl.handle.net/1911/16591en_US
dc.language.isoengen_US
dc.rightsCopyright is held by the author, unless otherwise indicated. Permission to reuse, publish, or reproduce the work beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.en_US
dc.subjectAstronomyen_US
dc.subjectAstrophysicsen_US
dc.subjectAtmospheric sciencesen_US
dc.subjectPlasma physicsen_US
dc.titleA modified flow/field model of the solar wind interaction with Marsen_US
dc.typeThesisen_US
dc.type.materialTexten_US
thesis.degree.departmentSpace Scienceen_US
thesis.degree.disciplineNatural Sciencesen_US
thesis.degree.grantorRice Universityen_US
thesis.degree.levelDoctoralen_US
thesis.degree.nameDoctor of Philosophyen_US
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