Zobrazeno 1 - 10
of 73
pro vyhledávání: '"W.G. Elford"'
Autor:
L. Campbell, W.G. Elford
Publikováno v:
Planetary and Space Science. 54:317-323
New methods of determining meteor speeds using radar are giving results with an accuracy of better that 1%. It is anticipated that this degree of precision will allow determinations of pre-atmospheric speeds of shower meteors as well as estimates of
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2d3176e8b597e2e922bea8706fc23255
https://doi.org/10.1016/j.pss.2005.12.016
https://doi.org/10.1016/j.pss.2005.12.016
Autor:
M. A. Cervera, W.G. Elford
Publikováno v:
Planetary and Space Science. 52:591-602
The meteor radar response function is an important tool for analyzing meteor backscatter observed by radar systems. We extend previous work on the development of the response function to include a non-uniform meteor ionization profile, provided by me
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4b0274f4ec9142a98018b9016edf0f6a
https://doi.org/10.1016/j.pss.2003.12.004
https://doi.org/10.1016/j.pss.2003.12.004
Autor:
W.G. Elford
Publikováno v:
Journal of Atmospheric and Solar-Terrestrial Physics. 63:143-153
MST radars have been used to detect and study meteors since the mid-1980s. By exploiting the narrow beamwidth, high-pulse repetition rate and measurement of echo phase inherent in such systems, a number of new techniques have been developed specifica
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::10aaf1a40a1e32dba2b8af2902950b1d
https://doi.org/10.1016/s1364-6826(00)00145-0
https://doi.org/10.1016/s1364-6826(00)00145-0
Autor:
W. J. Baggaley, V. Porubčan, R.L. Hawkes, P.B. Babadzhanov, W.J. Baggaley, J. Borovička, W.G. Elford, I. Hasegawa, P. Jenniskens, J. Jones, I. Mann, P. Spurný, I.P. Williams
Publikováno v:
Transactions of the International Astronomical Union. 24:156-169
The IAU Meteor Data Centre (MDC), maintained at Lund, Sweden, under the direction of Bertil Lindblad, remains a valuable resource for the meteor community. Commission 22 currently has representatives on two inter-commission Working Groups, The Preven
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c86fd88e7fc64dfba50cab5164b79af9
https://doi.org/10.1017/s0251107x00002819
https://doi.org/10.1017/s0251107x00002819
Autor:
A. D. Taylor, W.G. Elford
Publikováno v:
Earth, Planets and Space. 50:569-575
The orbital element distributions of meteoroids detected during the Harvard Radio Meteor Project, 1968–69 Synoptic Year Program, have been reanalysed to remove selection effects associated with the radar observations. Corrections are made for the o
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d0a6bb0f744362ef68aa125d40833bde
https://doi.org/10.1186/bf03352150
https://doi.org/10.1186/bf03352150
Autor:
A.D. Taylor, W.G. Elford
Publikováno v:
Highlights of Astronomy. 11:239-245
This paper briefly summarises the contribution to the understanding of meteoroids and their orbits from recent radar studies of meteors. New data from VHF and UHF observations indicates that some meteoroids are ablating at heights up to 160 km and mo
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::256071b7b76250ffd03f0e9fc5f98ea0
https://doi.org/10.1017/s1539299600020669
https://doi.org/10.1017/s1539299600020669
Autor:
W.G. Elford, A.D. Taylor
Publikováno v:
Journal of Atmospheric and Solar-Terrestrial Physics. 59:1021-1024
Narrow beam VHF radars are able to detect transient ionization at heights between 80 and 120 km produced by meteoroids entering the atmosphere ‘down-the-beam’. Using a vertically directed beam, observations of this new type of meteor echo on two
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8da8f57eae4d69ee838b57432e175439
https://doi.org/10.1016/s1364-6826(96)00083-1
https://doi.org/10.1016/s1364-6826(96)00083-1
Publikováno v:
Radio Science. 32:805-816
In this paper we describe a new technique for measuring the speeds of individual meteors based upon the variation of the phase received in specular reflections from the meteor train prior to the meteoroid reaching the point of closestapproach to the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8630bfd75064009b20995ae9392a7873
https://doi.org/10.1029/96rs03638
https://doi.org/10.1029/96rs03638
Publikováno v:
Advances in Space Research. 20:1501-1504
We have gathered substantial evidence from novel radar meteor observations that most meteoroids start to ablate at altitudes considerably in excess of 100 km (at heights up to ∼140 km). This beginning height hb is a strong function of the melting p
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::41d03df656e899a417ccbcc502d852e0
https://doi.org/10.1016/s0273-1177(97)00425-0
https://doi.org/10.1016/s0273-1177(97)00425-0
Autor:
J. P. Avery, W.G. Elford, Robert A. Vincent, Susan K. Avery, M. A. Cervera, Iain M. Reid, T. A. Valentic
Publikováno v:
Radio Science. 31:1313-1329
This paper describes a comparison of two meteor radar systems operated simultaneously from June 29 to July 15, 1994, at the Buckland Park field station near Adelaide, Australia (35°S, 138°E). Both meteor systems operate on a narrow-beam VHF wind pr
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::93f7987e8b36461a1c6ced7c9fabb33d
https://doi.org/10.1029/96rs02028
https://doi.org/10.1029/96rs02028