Gravity wave modulation of gradient drift instabilities in mid-latitude sporadic E irregularities

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dc.contributor.authorWoodman Pollitt, Ronald Francisco
dc.contributor.authorYamamoto, M.
dc.contributor.authorFukao, S.
dc.date.accessioned2016-10-17T21:42:12Z
dc.date.accessioned2017-12-21T19:41:39Z
dc.date.available2016-10-17T21:42:12Z
dc.date.available2017-12-21T19:41:39Z
dc.date.issued1991-07
dc.description.abstractRecent E region VHF backscatter echoes ob­served by the MU radar at mid-latitudes show quasi­periodic striations with a fairly constant range vs. time tilt in a RTI display. These features are explained in terms of gravity waves with frequencies close to the Brunt-Väisälä frequency which modulate the shape of sporadic E layers. The conditions of instability, when the magnetic field has a significant dip angle, is revised. Differing from previ­ous work, we argue that conditions of local gradient drift instability are not sufficient and one has to consider the integrated properties of each magnetic filed tube. Strat­ified sporadic E layers are stable using this new criteria, unless they are distorted to produce unstable integrated gradients. Gravity waves with phase fronts parallel to the magnetic dip angle are capable of producing such distor­tion, imposing its own temporal and spatial periodicity on the echoes.es_ES
dc.description.peer-reviewPor pareses_ES
dc.description.sponsorshipIGP, ROJes_ES
dc.formatapplication/pdfes_ES
dc.identifier.citationWoodman, R. F., Yamamoto, M., & Fukao, S. (1991). Gravity wave modulation of gradient drift instabilities in mid-latitude sporadic E irregularities.==$Geophysical Research Lettters, 18$==(7), 1197-1200. https://doi.org/10.1029/91GL01159es_ES
dc.identifier.doihttps://doi.org/10.1029/91GL01159es_ES
dc.identifier.govdocindex-oti2018
dc.identifier.journalGeophysical Research Letterses_ES
dc.identifier.urihttp://hdl.handle.net/20.500.12816/512
dc.language.isoenges_ES
dc.publisherAmerican Geophysical Uniones_ES
dc.relation.ispartofurn:issn:0094-8276
dc.rightsinfo:eu-repo/semantics/openAccesses_ES
dc.rights.urihttps://creativecommons.org/licences/by/4.0/es_ES
dc.subjectGravitational Waveses_ES
dc.subjectMagnetic Fieldses_ES
dc.subjectElectronic Densityes_ES
dc.subjectRadares_ES
dc.subject.ocdehttp://purl.org/pe-repo/ocde/ford#1.05.01es_ES
dc.titleGravity wave modulation of gradient drift instabilities in mid-latitude sporadic E irregularitieses_ES
dc.typeinfo:eu-repo/semantics/articlees_ES

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