Mostrar el registro sencillo del ítem Malhotra, Akshay Mathews, John D. Urbina, Julio 2018-07-17T16:34:25Z 2018-07-17T16:34:25Z 2007-12-27
dc.identifier.issn 2169-9402
dc.description En: Journal of Geophysical Research: Space Physics, v. 112, n. A12 (December 2007), p. A12303, 1-13. es_ES
dc.description.abstract "Nonclassical radar meteor echoes or range spread trail echoes (RSTEs), lasting from tens of seconds to over 15 min, have been a subject of considerable interest and speculation in the community ever since they were first observed in the 1940s. Using data collected from the Jicamarca Radio Observatory 50 MHz VHF radar in June 2006, we find that many properties of RSTEs can be explained largely from a radio science perspective. On a statistical basis, RSTEs of duration >15 s are observed exclusively from scatterers in the k⊥B (k = radar wave number; B = geomagnetic field) region apparently as the result of trail evolution parallel to B, forming approximately Fresnel-zone sized scattering regions thus narrowing the scattering pattern. This result implies that the initial irregularity structures in the meteor trail exhibit a wide scattering pattern that can be seen from anywhere in the radar beam given sufficient radar sensitivity but once the trail significantly elongates along B, it can be detected only from the k⊥B region of the radar. This conclusion has far-reaching implications to current interpretations of instability development in RSTEs as the location of the meteoroid trajectory relative to the narrow k⊥B region strongly determines observed RSTE properties such as onset time relative to the head echo and trail lifetime as functions of altitude. That is, a RSTE event viewed by two closely spaced identical radars would have different properties. Meteoroid size, energy, and fragmentation as well as radar properties such as frequency, beam pattern, and absolute sensitivity play obvious roles as well." es_ES
dc.format application/pdf es_ES
dc.language.iso eng es_ES
dc.publisher American Geophysical Union (AGU) es_ES
dc.rights info:eu-repo/semantics/restrictedAccess es_ES
dc.rights.uri info:eu-repo/semantics/restrictedAccess es_ES
dc.source Repositorio institucional - IGP es_ES
dc.subject Meteoros es_ES
dc.subject Meteorología por radar es_ES
dc.subject Radar--Perú--Mediciones es_ES
dc.subject Dispersión es_ES
dc.subject Ionósfera--Investigación--Perú es_ES
dc.subject Geomagnetismo es_ES
dc.title A radio science perspective on long-duration meteor trails es_ES
dc.type info:eu-repo/semantics/article es_ES
dc.subject.ocde Ciencias espaciales es_ES
dc.subject.ocde Atmósfera es_ES
dc.subject.ocde Meteorología es_ES
dc.subject.ocde Radar es_ES
dc.subject.ocde Perú es_ES
dc.subject.ocde Medición es_ES
dc.subject.ocde Estadística es_ES
dc.identifier.journal Journal of Geophysical Research: Space Physics es_ES
dc.description.peer-review Por pares es_ES
dc.identifier.doi 10.1029/2007JA012576 es_ES




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