Lunar tidal effects in the electrodynamics of the low-latitude ionosphere

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dc.contributor.authorTracy, B. D.
dc.date.accessioned2015-07-24T10:43:55Z
dc.date.accessioned2017-02-27T22:52:08Z
dc.date.available2015-07-24T10:43:55Z
dc.date.available2017-02-27T22:52:08Z
dc.date.issued2013
dc.description.abstractWe used extensive measurements made by the Jicamarca Unattended Long-Term Investigations of the Ionosphere and Atmosphere (JULIA) and Incoherent Scatter Radar (ISR) systems at Jicamarca, Peru during geomagnetic quiet conditions to determine the climatologies of lunar tidal effects on equatorial vertical plasma drifts. We use, for the first time, the expectation maximization (EM) algorithm to derive the amplitudes and phases of the semimonthly and monthly lunar tidal perturbations. Our results indicate, as expected, lunar tidal effects can significantly modulate the equatorial plasma drifts. The local time and seasonal dependent phase progression has been studied in much more detail than previously and has shown to have significant variations from the average value. The semimonthly drift amplitudes are largest during December solstice and smallest during June solstice during the day, and almost season independent at night. The monthly lunar tidal amplitudes are season independent during the day, while nighttime monthly amplitudes are largest and smallest in December solstice and autumnal equinox, respectively. The monthly and semimonthly amplitudes decrease from early morning to afternoon and evening to morning with moderate to large increases near dusk and dawn. We also examined these perturbation drifts during periods of sudden stratospheric warmings (SSWs). Our results show, for the first time, the enhancements of the lunar semimonthly tidal effects associated with SSWs to occur at night, as well as during the day. Our results also indicate during SSWs, monthly tidal effects are not enhanced as strongly as the semimonthly effects.es_ES
dc.description.uriTesises_ES
dc.formatapplication/pdfes_ES
dc.identifier.citationTracy, B. D. (2013).==$Lunar tidal effects in the electrodynamics of the low-latitude ionosphere$==(A thesis for the degree of Master of Science in Physics). Utah State University, United States.es_ES
dc.identifier.urihttp://hdl.handle.net/20.500.12816/40
dc.language.isoenges_ES
dc.publisherUtah State Universityes_ES
dc.rightsinfo:eu-repo/semantics/restrictedAccesses_ES
dc.subjectIonospherees_ES
dc.subjectLunar tideses_ES
dc.subjectElectrodynamicses_ES
dc.subjectPlasmaes_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.titleLunar tidal effects in the electrodynamics of the low-latitude ionospherees_ES
dc.typeinfo:eu-repo/semantics/masterThesises_ES
thesis.degree.disciplineFísicaes_ES
thesis.degree.grantorUtah State Universityes_ES
thesis.degree.levelMaestríaes_ES
thesis.degree.nameMaster of Science in Physicses_ES

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