Mostrar el registro sencillo del ítem Nicolls, M. J. Kelley, M. C. Vlasov, M. N. Sahai, Y. Chau Chong Shing, Jorge Luis Hysell, D. L. Fagundes, P. R. Becker-Guedes, F. Lima, W. L. C. 2018-07-16T16:27:37Z 2018-07-16T16:27:37Z 2006-07-03
dc.identifier.issn 1432-0576
dc.description En: Annales Geophysicae, v. 24, n. 5, (July 2006) p. 1317-1331. es_ES
dc.description.abstract "We report here on post-midnight uplifts near the magnetic equator. We present observational evidence from digital ionosondes in Brazil, a digisonde in Peru, and other measurements at the Jicamarca Radio Observatory that show that these uplifts occur fairly regularly in the post-midnight period, raising the ionosphere by tens of kilometers in the most mild events and by over a hundred kilometers in the most severe events. We show that in general the uplifts are not the result of a zonal electric field reversal, and demonstrate instead that the uplifts occur as the ionospheric response to a decreasing westward electric field in conjunction with sufficient recombination and plasma flux. The decreasing westward electric field may be caused by a change in the wind system related to the midnight pressure bulge, which is associated with the midnight temperature maximum. In order to agree with observations from Jicamarca and Palmas, Brazil, it is shown that there must exist sufficient horizontal plasma flux associated with the pressure bulge. In addition, we show that the uplifts may be correlated with a secondary maximum in the spread-F occurrence rate in the post-midnight period. The uplifts are strongly seasonally dependent, presumably according to the seasonal dependence of the midnight pressure bulge, which leads to the necessary small westward field in the post-midnight period during certain seasons. We also discuss the enhancement of the uplifts associated with increased geomagnetic activity, which may be related to disturbance dynamo winds. Finally, we show that it is possible using simple numerical techniques to estimate the horizontal plasma flux and the vertical drift velocity from electron density measurements in the post-midnight period." es_ES
dc.format application/pdf es_ES
dc.language.iso eng es_ES
dc.publisher European Geosciences Union (EGU) es_ES
dc.rights info:eu-repo/semantics/openAccess es_ES
dc.rights.uri es_ES
dc.source Repositorio institucional - IGP es_ES
dc.subject Ionósfera--Investigación es_ES
dc.subject Campos eléctricos es_ES
dc.subject Radar--Observaciones es_ES
dc.subject Geomagnetismo--Variaciones diurnas es_ES
dc.subject Plasmas espaciales es_ES
dc.title Observations and modeling of post-midnight uplifts near the magnetic equator es_ES
dc.type info:eu-repo/semantics/article es_ES
dc.subject.ocde Atmósfera es_ES
dc.subject.ocde Radar es_ES
dc.subject.ocde Ciencias espaciales es_ES
dc.subject.ocde Observación es_ES
dc.subject.ocde Procesamiento de datos es_ES
dc.identifier.journal Annales Geophysicae es_ES
dc.description.peer-review Por pares es_ES
dc.identifier.doi 10.5194/angeo-24-1317-2006 es_ES




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