Doctoral Dissertations

Date of Award

12-1988

Degree Type

Dissertation

Degree Name

Doctor of Philosophy

Major

Mechanical Engineering

Major Professor

F. Shahrokhi

Committee Members

K. C. Reddy, Robert L. Young, Walter Frost

Abstract

The purpose of this investigation is to calculate the total electron content and four oxygen emissions for solar cycle maximum at equinox season. The investigation shows that the total electron content reaches its maximum development at 2100 LT with the crest nearest to the equator being the greatest. This asymmetry reverses at 0200 LT when the crest farthest from the equator is smallest. In spite of the fact that while Nmax decreases at noon, and the layer becomes greater in altitude under the influence of the upward drift, the noon bite out occurs at the equator around 1200 LT.

The behavior of OI 6300°A, the brightest day glow source is investigated. The oxygen at 6300°A is strongly a function of Nmax and hmax- The data for the 01 o 6300A reveal that the latitudinal asymmetry is associated with the asymmetry in altitude of F2 peak. The maximum electron density height is strongly affected by vertical E × B drift velocity. The emission at 1356°A and 7774°A is calculated using the radiative recombination and ion-ion recombination processes. The ion-ion recombination has substantial effect in total emission rates. The intensity of OI 911°A due to direct recombination to the ground state is obtained. These emissions can be used as a way of remotely sensing the F region and exosphere plasma properties, and the winds responsible for plasma transport.

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