MELISSA: system description and spectral features of pre‐ and post‐midnight F‐region echoes

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dc.contributor.authorRodrigues, Fabiano S.
dc.contributor.authorZhan, Weijia
dc.contributor.authorMilla, Marco
dc.contributor.authorFejer, Bela G.
dc.contributor.authorDe Paula, Eurico R.
dc.contributor.authorNeto, Acacio C.
dc.contributor.authorSantos, Angela M.
dc.contributor.authorBatista, Inez S.
dc.date.accessioned2021-02-16T08:50:11Z
dc.date.available2021-02-16T08:50:11Z
dc.date.issued2019-12
dc.description.abstractMost of the low‐latitude ionospheric radar observations in South America come from the Jicamarca Radio Observatory, located in the western longitude sector (∼75°W). The deployment of the 30 MHz FAPESP Clemson‐INPE (FCI) coherent backscatter radar in the magnetic equatorial site of São Luis, Brazil, in 2001 allowed observations to be made in the eastern sector (∼45°W). However, despite being operational for several years (2001–2012), FCI only made observations during daytime and pre midnight hours, with a few exceptions. Here, we describe an upgraded system that replaced the FCI radar and present results of full‐night F‐region observations. This radar is referred to as Measurements of Equatorial and Low‐latitude Ionospheric irregularities over São Luís, South America (MELISSA), and made observations between March 2014 and December 2018. We present results of our analyses of pre‐ and post‐midnight F region echoes with focus on the spectral features of post‐midnight echoes and how they compare to spectra of echoes observed in the post‐sunset sector. The radar observations indicate that post‐midnight F‐region irregularities were generated locally and were not a result of “fossil” structures generated much earlier in time (in other longitude sectors) and that drifted into the radar field‐of‐view. This also includes cases where the echoes are weak and that would be associated with decaying equatorial spread F (ESF) structures. Collocated digisonde observations show modest but noticeable F‐region apparent uplifts prior to post‐midnight ESF events. We associate the equatorial uplifts with disturbed dynamo effects and with destabilizing F‐region conditions leading to ESF development.es_ES
dc.description.peer-reviewPor pareses_ES
dc.formatapplication/pdfes_ES
dc.identifier.citationRodrigues, F. S., Zhan, W., Milla, M. A., Fejer, B. G., De Paula, E. R., Neto, A. C., ... & Batista, I. S. (2019). MELISSA: system description and spectral features of pre‐ and post‐midnight F‐region echoes.==$Journal of Geophysical Research: Space Physics, 124$==(12), 10482-10496. https://doi.org/10.1029/2019JA027445es_ES
dc.identifier.doihttps://doi.org/10.1029/2019JA027445es_ES
dc.identifier.govdocindex-oti2018
dc.identifier.journalJournal of Geophysical Research: Space Physicses_ES
dc.identifier.urihttp://hdl.handle.net/20.500.12816/4912
dc.language.isoenges_ES
dc.publisherAmerican Geophysical Uniones_ES
dc.relation.ispartofurn:issn:2169-9380
dc.rightsinfo:eu-repo/semantics/closedAccesses_ES
dc.subjectEquatoriales_ES
dc.subjectIrregularitieses_ES
dc.subjectIonospherees_ES
dc.subjectRadares_ES
dc.subjectSpread Fes_ES
dc.subject.ocdehttp://purl.org/pe-repo/ocde/ford#1.05.01es_ES
dc.titleMELISSA: system description and spectral features of pre‐ and post‐midnight F‐region echoeses_ES
dc.typeinfo:eu-repo/semantics/articlees_ES

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