An overview and synthesis of plasma irregularities in equatorial spread F

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dc.contributor.authorHysell, D. L.
dc.date.accessioned2018-10-22T16:14:47Z
dc.date.available2018-10-22T16:14:47Z
dc.date.issued2000-10-06
dc.description.abstractA unified picture of plasma irregularities in equatorial spread F is developed from the analysis of satellite, sounding rocket, and coherent scatter radar observations. The coherent scatter data are analyzed using a new in-beam radar imaging technique that permits direct comparison between radar data, in situ data, and computer simulations of the irregularities. Three varieties of irregularities, all produced by ionospheric interchange instabilities, are found to occur. Thin bottom-type layers are composed of waves with primary transverse wavelengths less than about 1 km and with significant parallel wavenumbers. These exist on magnetic flux tubes controlled by the E region dynamo and drift westward in the postsunset ionosphere. A nonlocal analysis is used to calculate their linear growth rate. When the F region dynamo takes control of the flux tube, bottomside irregularities can emerge. These are more robust irregularities with longer primary wavelengths and which exhibit greater vertical development. Nonlinear analyses explain the appearance of steepened structures in rocket observations and solitary waves in satellite observations of bottomside layers. The one-dimensional spectra of these irregularities obey power laws but are anisotropic and have variable spectral indices and spectral breaks. Very strong polarization electric fields can eject large regions of deeply depleted plasma through the F peak and form topside irregularities. Theoretical calculations supported by satellite data show that ion inertia may become important for topside irregularities. The one-dimensional spectra of irregularities in the inertial regime obey a k−5/3 power law, but strong plasma inhomogeneity implies that Kolmogorov weak turbulence is not the explanation. Topside depletions are shown to bifurcate and also to pinch off from the bottomside.es_ES
dc.description.peer-reviewPor pareses_ES
dc.formatapplication/pdfes_ES
dc.identifier.citationHysell, D. L. (2000). An overview and synthesis of plasma irregularities in equatorial spread F.==$Journal of Atmospheric and Solar-Terrestrial Physics, 62$==(12), 1037-1056. https://doi.org/10.1016/S1364-6826(00)00095-Xes_ES
dc.identifier.doihttps://doi.org/10.1016/S1364-6826(00)00095-Xes_ES
dc.identifier.journalJournal of Atmospheric and Solar-Terrestrial Physicses_ES
dc.identifier.urihttp://hdl.handle.net/20.500.12816/3088
dc.language.isoenges_ES
dc.publisherElsevieres_ES
dc.relation.ispartofurn:issn:1364-6826
dc.rightsinfo:eu-repo/semantics/restrictedAccesses_ES
dc.subjectIonospheric irregularitieses_ES
dc.subjectEquatorial ionospherees_ES
dc.subjectEquatorial spread Fes_ES
dc.subject.ocdehttp://purl.org/pe-repo/ocde/ford#1.05.01es_ES
dc.titleAn overview and synthesis of plasma irregularities in equatorial spread Fes_ES
dc.typeinfo:eu-repo/semantics/articlees_ES

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