High altitude echoes from the equatorial topside ionosphere during solar minimum

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dc.contributor.authorDerghazarian, S.
dc.contributor.authorHysell, D. L.
dc.contributor.authorKuyeng, K.
dc.contributor.authorMilla, Marco
dc.date.accessioned2021-06-30T11:38:30Z
dc.date.available2021-06-30T11:38:30Z
dc.date.issued2021-02
dc.description.abstractWe describe a new class of nonthermal plasma density irregularities observed in the postmidnight topside equatorial ionosphere under low solar flux conditions. They are distinct from irregularities associated with equatorial spread F (ESF) in terms of their morphology and because they exhibit strong spectral sidebands at the lower-hybrid frequency. The coherent echoes were observed in a series high-altitude radar experiments performed at Jicamarca utilizing long- and coded double-pulse modes and a dual-beam mode. The coded double-pulse mode was used to measure the low-frequency characteristics of the echoes with fine range resolution. Doppler shifts of the main backscatter line were observed to fall between ±150 m/s. The long-pulse mode was employed for high-frequency spectral analysis which revealed the presence of strong spectral sidelobes at the lower-hybrid frequency. A dual-beam mode was used to investigate the horizontal structure of the echoes. Zonal drift speeds of 50–70 m/s were inferred with this mode, and longitudinal dimensions of approximately 270 km were estimated. The study summarizes with a discussion of different mechanisms that may be responsible for the phenomenon and the lower-hybrid sidebands in particular.es_ES
dc.description.peer-reviewPor pareses_ES
dc.formatapplication/pdfes_ES
dc.identifier.citationDerghazarian, S., Hysell, D. L., Kuyeng, K., & Milla, M. A. (2021). High altitude echoes from the equatorial topside ionosphere during solar minimum.==$Journal of Geophysical Research: Space Physics, 126$==(2), e2020JA028424. https://doi.org/10.1029/2020JA028424
dc.identifier.doihttps://doi.org/10.1029/2020JA028424es_ES
dc.identifier.govdocindex-oti2018
dc.identifier.journalJournal of Geophysical Research: Space Physicses_ES
dc.identifier.urihttp://hdl.handle.net/20.500.12816/4953
dc.language.isoenges_ES
dc.publisherAmerican Geophysical Uniones_ES
dc.relation.ispartofurn:issn:2169-9402
dc.rightsinfo:eu-repo/semantics/closedAccesses_ES
dc.subjectEchoes at low solar fluxes_ES
dc.subjectHigh altitude echoeses_ES
dc.subjectLower hybrid waveses_ES
dc.subjectPlasmaspheric echoeses_ES
dc.subject.ocdehttps://purl.org/pe-repo/ocde/ford#1.05.01es_ES
dc.titleHigh altitude echoes from the equatorial topside ionosphere during solar minimumes_ES
dc.typeinfo:eu-repo/semantics/articlees_ES

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