Sporadic meteor sources as observed by the Jicamarca high-power large-aperture VHF radar

Main Author: Chau Chong Shing, Jorge Luis
Other Authors: Woodman Pollitt, Ronald Francisco, Galindo, Freddy
Format: Contribución a una Publicación Periódica
Language: eng
Published: 2006
Subjects:
Online Access: http://repositorio.igp.gob.pe/handle/IGP/319
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spelling Chau Chong Shing, Jorge LuisWoodman Pollitt, Ronald FranciscoGalindo, Freddy2016-11-07T20:56:07Z2017-12-21T19:41:55Z2016-11-07T20:56:07Z2017-12-21T19:41:55Z2006http://repositorio.igp.gob.pe/handle/IGP/31910.1016/j.icarus.2006.11.006En: ICARUS 188 (2007), p. 162-174.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 ∼91% of the observations. The other ∼9% 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.Submitted by Biblioteca Central (biblio@igp.gob.pe) on 2016-11-07T20:56:07Z No. of bitstreams: 1 Sporadic meteor sources as observed by the Jicamarca High-power large-aperture VHF radar-2006.PDF: 351614 bytes, checksum: e41612756984c67bfc329aea859271fc (MD5)Made available in DSpace on 2016-11-07T20:56:07Z (GMT). No. of bitstreams: 1 Sporadic meteor sources as observed by the Jicamarca High-power large-aperture VHF radar-2006.PDF: 351614 bytes, checksum: e41612756984c67bfc329aea859271fc (MD5) Previous issue date: 2006Made available in DSpace on 2017-12-21T19:41:55Z (GMT). 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dc.title.es_ES.fl_str_mv Sporadic meteor sources as observed by the Jicamarca high-power large-aperture VHF radar
title Sporadic meteor sources as observed by the Jicamarca high-power large-aperture VHF radar
spellingShingle Sporadic meteor sources as observed by the Jicamarca high-power large-aperture VHF radar
Chau Chong Shing, Jorge Luis
Meteoritos
Ionósfera
Radar
Observaciones
Atmósfera
title_short Sporadic meteor sources as observed by the Jicamarca high-power large-aperture VHF radar
title_full Sporadic meteor sources as observed by the Jicamarca high-power large-aperture VHF radar
title_fullStr Sporadic meteor sources as observed by the Jicamarca high-power large-aperture VHF radar
title_full_unstemmed Sporadic meteor sources as observed by the Jicamarca high-power large-aperture VHF radar
title_sort Sporadic meteor sources as observed by the Jicamarca high-power large-aperture VHF radar
author Chau Chong Shing, Jorge Luis
author_facet Chau Chong Shing, Jorge Luis
Woodman Pollitt, Ronald Francisco
Galindo, Freddy
author_role author
author2 Woodman Pollitt, Ronald Francisco
Galindo, Freddy
author2_role author
author
dc.contributor.author.fl_str_mv Chau Chong Shing, Jorge Luis
Woodman Pollitt, Ronald Francisco
Galindo, Freddy
dc.subject.es_ES.fl_str_mv Meteoritos
Ionósfera
Radar
Observaciones
Atmósfera
topic Meteoritos
Ionósfera
Radar
Observaciones
Atmósfera
dc.description.es_ES.fl_txt_mv En: ICARUS 188 (2007), p. 162-174.
dc.description.abstract.es_ES.fl_txt_mv 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 ∼91% of the observations. The other ∼9% 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.
dc.description.sponsorship.es_ES.fl_txt_mv IGP, ROJ
description En: ICARUS 188 (2007), p. 162-174.
publishDate 2006
dc.date.accessioned.none.fl_str_mv 2016-11-07T20:56:07Z
2017-12-21T19:41:55Z
dc.date.available.none.fl_str_mv 2016-11-07T20:56:07Z
2017-12-21T19:41:55Z
dc.date.issued.fl_str_mv 2006
dc.type.es_ES.fl_str_mv info:eu-repo/semantics/contributionToPeriodical
format contributionToPeriodical
dc.identifier.uri.none.fl_str_mv http://repositorio.igp.gob.pe/handle/IGP/319
dc.identifier.doi.none.fl_str_mv 10.1016/j.icarus.2006.11.006
url http://repositorio.igp.gob.pe/handle/IGP/319
identifier_str_mv 10.1016/j.icarus.2006.11.006
dc.language.iso.es_ES.fl_str_mv eng
language eng
dc.rights.es_ES.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.es_ES.fl_str_mv Instituto Geofísico del Perú, Radio Observatorio de Jicamarca
dc.source.es_ES.fl_str_mv Repositorio institucional - IGP
dc.source.none.fl_str_mv reponame:IGP-Institucional
instname:Instituto Geofísico del Perú
instacron:IGP
reponame_str IGP-Institucional
collection IGP-Institucional
instname_str Instituto Geofísico del Perú
instacron_str IGP
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