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dc.contributor.author Lehmacher, G. A.
dc.contributor.author Kudeki, E.
dc.contributor.author Akgiray, A.
dc.contributor.author Guo, L.
dc.contributor.author Reyes, P.
dc.contributor.author Chau Chong Shing, Jorge Luis
dc.coverage.spatial Jicamarca
dc.date.accessioned 2018-07-19T16:06:53Z
dc.date.available 2018-07-19T16:06:53Z
dc.date.issued 2009-07-06
dc.identifier.citation Lehmacher, G. A., Kudeki, E., Akgiray, A., Guo, L., Reyes, P., & Chau, J. L. (2009). Radar cross sections for mesospheric echoes at Jicamarca.==$Annales Geophysicae, 27$==(7), 2675-2684. https://doi.org/10.5194/angeo-27-2675-2009 es_ES
dc.identifier.govdoc index-oti2018
dc.identifier.uri http://hdl.handle.net/20.500.12816/1968
dc.description.abstract Radar cross sections (RCS) of mesospheric layers at 50 MHz observed at Jicamarca, Peru, range from 10−18 to 10−16 m−1, three orders of magnitudes smaller than cross sections reported for polar mesospheric winter echoes during solar proton events and six orders of magnitude smaller than polar mesospheric summer echoes. Large RCS are found in thick layers around 70 km that also show wide radar spectra, which is interpreted as turbulent broadening. For typical atmospheric and ionospheric conditions, volume scattering RCS for stationary, homogeneous, isotropic turbulence at 3 m are also in the range 10−18 to 10−16 m−1, in reasonable agreement with measurements. Moreover, theory predicts maximum cross sections around 70 km, also in agreement with observations. Theoretical values are still a matter of order-of-magnitude estimation, since the Bragg scale of 3 m is near or inside the viscous subrange, where the form of the turbulence spectrum is not well known. In addition, steep electron density gradients can increase cross-sections significantly. For thin layers with large RCS and narrow spectra, isotropic turbulence theory fails and scattering or reflection from anisotropic irregularities may gain relevance. 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/restrictedAccess es_ES
dc.subject Ionosphere es_ES
dc.subject Turbulence es_ES
dc.subject Atmospheric propagation es_ES
dc.title Radar cross sections for mesospheric echoes at Jicamarca 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-27-2675-2009 es_ES

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