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dc.contributor.author Lehmacher, G. A.
dc.contributor.author Kudeki, E.
dc.date.accessioned 2018-10-24T12:50:38Z
dc.date.available 2018-10-24T12:50:38Z
dc.date.issued 2003-12-18
dc.identifier.citation Lehmacher, G. A., & Kudeki, E. (2003). Variability of equatorial mesospheric echoes.==$Advances in Space Research, 32$==(5), 747-752. https://doi.org/10.1016/S0273-1177(03)00410-1 es_ES
dc.identifier.uri http://hdl.handle.net/20.500.12816/3118
dc.description.abstract Selected results from recent mesospheric campaigns with the 50-MHz Jicamarca radar in August 1998, December 1999 and January 2000 are reported. The data were acquired with 300 and 450 m rangemresolution and processed with 1 minute time resolution. The focus of this study is on signal-to-noise ratio and its variability on short and long time scales. System changes such as transmitter power were monitored using the signal level near the tropopause. We found that the daily mesopheric signal and its variability increase with solar activity monitored by the sunspot number. Several short-term enhancements of signal power could be linked to solar x-ray flares. Both observations agree with the basic assumption that high electron densities and strong density gradients enhance the illumination of mesospheric turbulence. Daily recurring and descending layers in August is evidence for strong tidal modulation of the dynamic processes that cause the echoes. The good range and time resolution allows to identify many complex structures within the echo layers, including braids and cat's eyes that may be evidence for dynamical instabilities in the mesosphere. es_ES
dc.format application/pdf es_ES
dc.language.iso eng es_ES
dc.publisher Elsevier es_ES
dc.relation.ispartof urn:issn:0273-1177
dc.rights info:eu-repo/semantics/restrictedAccess es_ES
dc.subject Electron density es_ES
dc.subject Mesosphere es_ES
dc.subject Radar es_ES
dc.title Variability of equatorial mesospheric echoes 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 Advances in Space Research es_ES
dc.description.peer-review Por pares es_ES
dc.identifier.doi https://doi.org/10.1016/S0273-1177(03)00410-1 es_ES

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