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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.citation Chau, J. L., & Kudeki, E. (2006). Statistics of 150-km echoes over Jicamarca based on low-power VHF observations.==$Annales Geophysicae, 24$==(5), 1305-1310. https://doi.org/10.5194/angeo-24-1305-2006 es_ES
dc.identifier.govdoc index-oti2018
dc.identifier.uri http://hdl.handle.net/20.500.12816/1898
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.language.iso eng es_ES
dc.publisher European Geosciences Union (EGU) es_ES
dc.relation.ispartof urn:issn:0992-7689
dc.rights info:eu-repo/semantics/openAccess es_ES
dc.rights.uri https://creativecommons.org/licences/by/4.0/ es_ES
dc.subject Ionosphere es_ES
dc.subject Equatorial ionosphere es_ES
dc.subject Ionospheric irregularities es_ES
dc.subject Electric fields and currents 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 http://purl.org/pe-repo/ocde/ford#1.05.01 es_ES
dc.identifier.journal Annales Geophysicae es_ES
dc.description.peer-review Por pares es_ES
dc.identifier.doi https://doi.org/10.5194/angeo-24-1305-2006 es_ES

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