The equatorial electrojet radar observations and modeling

dc.contributor.advisorHysell, D.
dc.contributor.authorShume, Esayas Belay
dc.date.accessioned2019-04-17T15:45:09Z
dc.date.available2019-04-17T15:45:09Z
dc.date.issued2006-08
dc.description.abstractThis dissertation describes a theoretical, experimental, and modeling investigation of the equatorial electrojet. We review low latitude ionospheric current models, synthesizing developments from the early times until the present. We then show how to utilize equatorial electrojet irregularities to infer E region electron density and wind profiles from coherent scatter radar experiments. The procedure involves a numerical model of the equatorial ionosphere that relates the vector electric field and current density to the winds. We present electron densities inferred in the equatorial electrojet inferred using a new bistatic radar system installed between Paracas and Jicamarca, Peru. The radar system monitors density profiles using a coherent scatter radar technique that utilizes the Faraday rotation of the scattered signal. Radar measured density profiles are validated by comparing with other electron density measures. A three dimensional electrostatic potential model of the equatorial ionosphere in a magnetic dipole coordinate system is described. The model incorporates realistic ionospheric conductivities, electric fields, winds, and includes anamalous collision effects. The model utilizes bistatic radar measured densities, coherent scatter spectral measurements made at large zenith angles, and electric fields derived from 150 km echo drifts. The model is also constrained by magnetometer records. We next present a technique for extracting zonal winds in the equatorial electrojet from the Doppler shifts of type II radar echoes measured by a narrow beam, obliquely oriented antenna at the Jicamarca Radio Observatory. The wind profiles were retrieved by combining the 3-D model with theory and measurements of type II echo Doppler shifts. The amplitude and phasing of the calculated wind profiles are in general agreement with satellite and rocket-borne wind measurements. We have used height varying type I radar echoes and large-scale electrojet irregularities inferred from interferometric imaging to validate wind profiles estimates derived from type II echoes.es_ES
dc.description.uriTesises_ES
dc.formatapplication/pdfes_ES
dc.identifier.citationShume, E. B. (2006).==$The equatorial electrojet radar observations and modeling$==(Dissertation for the degree of Doctor of Philosophy). Cornell University, United States.es_ES
dc.identifier.urihttp://hdl.handle.net/20.500.12816/4486
dc.language.isoenges_ES
dc.publisherCornell Universityes_ES
dc.rightsinfo:eu-repo/semantics/openAccesses_ES
dc.rights.urihttps://creativecommons.org/licences/by/4.0/es_ES
dc.subjectIonospherees_ES
dc.subjectRadares_ES
dc.subjectElectronic densityes_ES
dc.subjectElectric fieldes_ES
dc.subject.ocdehttp://purl.org/pe-repo/ocde/ford#1.03.00es_ES
dc.subject.ocdehttp://purl.org/pe-repo/ocde/ford#1.05.01es_ES
dc.titleThe equatorial electrojet radar observations and modelinges_ES
dc.typeinfo:eu-repo/semantics/doctoralThesises_ES
thesis.degree.disciplineFísicaes_ES
thesis.degree.grantorCornell University. Faculty of the Graduate Schooles_ES
thesis.degree.levelDoctoradoes_ES
thesis.degree.nameDoctor of Philosophyes_ES

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