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dc.contributor.author Chau Chong Shing, Jorge Luis
dc.contributor.author Kudeki, E.
dc.date.accessioned 2018-07-16T17:16:18Z
dc.date.available 2018-07-16T17:16:18Z
dc.date.issued 2006-01
dc.identifier.issn 1432-0576
dc.identifier.uri http://repositorio.igp.gob.pe/handle/IGP/1898
dc.description En: Annales Geophysicae, v. 24, n. 5 (July 2006), p. 1305-1310. es_ES
dc.description.abstract "In this work we summarize the statistics of the socalled 150-km echoes obtained with a low-power VHF radar operation at the Jicamarca Radio Observatory (11.97◦ S, 76.87◦ W, and 1.3 ◦ dip angle at 150-km altitude) in Peru. Our results are based on almost four years of observations between August 2001 and July 2005 (approximately 150 days per year). The majority of the observations have been conducted between 08:00 and 17:00 LT. We present the statistics of occurrence of the echoes for each of the four seasons as a function of time of day and altitude. The occurrence frequency of the echoes is ∼75% around noon and start decreasing after 15:00 LT and disappear after 17:00 LT in all seasons. As shown in previous campaign observations, the 150-echoes appear at a higher altitude (>150 km) in narrow layers in the morning, reaching lower altitudes (∼135 km) around noon, and disappear at higher altitudes (>150 km) after 17:00 LT. We show that although 150-km echoes are observed all year long, they exhibit a clear seasonal variability on altitudinal coverage and the percentage of occurrence around noon and early in the morning. We also show that there is a strong day-to-day variability, and no correlation with magnetic activity. Although our results do not solve the 150-km riddle, they should be taken into account when a reasonable theory is proposed." es_ES
dc.format application/pdf es_ES
dc.format.extent En: Annales Geophysicae, v. 24, n. 5 (January 2006), p. 1305-1310.
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 http://creativecommons.org/licences/by-nc-nd/2.5/pe/ es_ES
dc.source Repositorio institucional - IGP es_ES
dc.subject Ionósfera es_ES
dc.subject Campos eléctricos es_ES
dc.subject Ionósfera--Observaciones es_ES
dc.subject Ecos es_ES
dc.subject Variaciones estacionales es_ES
dc.title Statistics of 150-km echoes over Jicamarca based on low-power VHF observations es_ES
dc.type info:eu-repo/semantics/article es_ES
dc.subject.ocde Radar es_ES
dc.subject.ocde Atmósfera es_ES
dc.subject.ocde Perú es_ES
dc.subject.ocde Observación es_ES
dc.subject.ocde Medición es_ES
dc.subject.ocde Estadística es_ES
dc.subject.ocde Estaciones del año es_ES
dc.identifier.journal Annales Geophysicae es_ES
dc.description.peer-review Por pares es_ES
dc.identifier.doi 10.5194/angeo-24-1305-2006 es_ES

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