Mostrar el registro sencillo del ítem Chau Chong Shing, Jorge Luis Woodman Pollitt, Ronald Francisco Galindo, Freddy 2018-10-29T18:38:42Z 2018-10-29T18:38:42Z 2007-05
dc.identifier.citation Chau, J. L., Woodman, R. F., & Galindo, F. (2006). Sporadic meteor sources as observed by the Jicamarca high-power large-aperture VHF radar. ==$Icarus, 188$== (1), 162-174. es_ES
dc.identifier.govdoc index-oti2018
dc.description.abstract We present, for the first time, the main sources of sporadic meteors as inferred from meteor-head echoes obtained by a high-power large-aperture radar (HPLAR). Such results have been obtained at the Jicamarca HPLAR (11.95° S, 76.87° W, 1° dip angle). Observations are based on close to 170,000 meteors detected in less than 90 h spread over 14 days, between November 2001 and February 2006. Meteors with solar orbits are observed to come from basically six previously known sources, i.e., North and South Apex, Helion, Anti-Helion, and North and South Toroidal, representing of the observations. The other represents meteors with observed velocities greater than the Sun's escape velocity at 1 AU, most of them of extra-solar origin. Results are given before and after removing the Earth's velocity and the sources are modeled with two-dimensional Gaussian distributions. In general, our results are in very good agreement with previously known sources reported by Jones and Brown [Jones, J., Brown, P.G., 1993. Mon. Not. R. Astron. Soc. 265, 524–532] using mainly specular meteor radar (SMR) data gathered over many years and different sites. However, we find slightly different locations and widths, that could be explained on the basis of different sensitivities of the two techniques and/or corrections needed to our results. For example, we find that the North and South Apex sources are well defined and composed each of them of two collocated Gaussian distributions, one almost isotropic with ∼10° width and the other very narrow in ecliptic longitude and wide in ecliptic latitude. This is the first time these narrow-width sources are reported. A careful quantitative analysis is needed to be able to compare the strengths of meteor sources as observed with different techniques. We also present speed and initial altitude distributions for selected sources. Using a simple angular sensitivity function of the combined Earth–atmosphere–radar instrument, and an altitude selection criteria, the resulting meteor sources are in better qualitative agreement with the results obtained with SMRs. es_ES
dc.format application/pdf es_ES
dc.language.iso eng es_ES
dc.publisher Elsevier es_ES
dc.relation.ispartof urn:issn:0019-1035
dc.rights info:eu-repo/semantics/restrictedAccess es_ES
dc.subject Meteors es_ES
dc.subject Ionospheres es_ES
dc.subject Radar observations es_ES
dc.title Sporadic meteor sources as observed by the Jicamarca high-power large-aperture VHF radar es_ES
dc.type info:eu-repo/semantics/article es_ES
dc.subject.ocde es_ES
dc.identifier.journal Icarus es_ES
dc.description.peer-review Por pares es_ES
dc.identifier.doi es_ES




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