Survey and analysis of auroral arcs in the dusk and midnight sector

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dc.contributor.advisorMurphree, John Sandy
dc.contributor.authorJohnson, Michelle Laurie
dc.date.accessioned2005-07-29T21:34:41Z
dc.date.available2005-07-29T21:34:41Z
dc.date.issued1996
dc.descriptionBibliography: p. 177-184.en
dc.description.abstractUltraviolet auroral imagery obtained by the Freja satellite between October 26 , 1992 and December 20, 1992 is calibrated and surveyed in search of auroral arcs. Of the 512 orbits surveyed, 80 provide imagery of auroral arcs, 50 of which are suitable for a comparison of imagery and Frej a in-situ measurements. The auroral arcs identified in the imagery consist of both undistorted and distorted arcs (ripples , pre-spirals and spirals). Characteristics of the processes involved in the formation of these arcs are suggested by temporal and spatial characteristics of the arcs as extracted from the auroral imagery and near simultaneous electric field measurements. The continuity of current within the region of the arc's current sheet, is found to be satisfied by both polarization electric fields and fields associated with enhanced field-aligned current. Characteristics of the distorted arcs suggest that shear-driven current-sheet instabilities are involved in their formation.
dc.format.extentxii, 187 leaves : ill. ; 30 cm.en
dc.identifier.citationJohnson, M. L. (1996). Survey and analysis of auroral arcs in the dusk and midnight sector (Master's thesis, University of Calgary, Calgary, Canada). Retrieved from https://prism.ucalgary.ca. doi:10.11575/PRISM/16636en_US
dc.identifier.doihttp://dx.doi.org/10.11575/PRISM/16636
dc.identifier.isbn0612128822en
dc.identifier.lccQC 971 J63 1996en
dc.identifier.urihttp://hdl.handle.net/1880/29483
dc.language.isoeng
dc.publisher.institutionUniversity of Calgaryen
dc.publisher.placeCalgaryen
dc.rightsUniversity of Calgary graduate students retain copyright ownership and moral rights for their thesis. You may use this material in any way that is permitted by the Copyright Act or through licensing that has been assigned to the document. For uses that are not allowable under copyright legislation or licensing, you are required to seek permission.
dc.subject.lccQC 971 J63 1996en
dc.subject.lcshAuroras - Research
dc.subject.lcshPlasma - Dynamics
dc.subject.lcshSpace plasmas
dc.subject.lcshMagnetosphere
dc.titleSurvey and analysis of auroral arcs in the dusk and midnight sector
dc.typemaster thesis
thesis.degree.disciplinePhysics and Astronomy
thesis.degree.grantorUniversity of Calgary
thesis.degree.nameMaster of Science (MSc)
ucalgary.item.requestcopytrue
ucalgary.thesis.accessionTheses Collection 58.002:Box 1038 520538465
ucalgary.thesis.notesUARCen
ucalgary.thesis.uarcreleaseyen
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