Results 121 to 130 of about 20,282 (172)
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Canadian Journal of Physics, 1964
Mean daily values of meteor flux for three categories of meteor echoes are tabulated for the period 1958 to 1962. The variation of echo rate with echo duration is studied. The difficulty of using this relation to determine the mass distribution of meteoroids in interplanetary space is noted.
Peter M. Millman, Bruce A. McIntosh
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Mean daily values of meteor flux for three categories of meteor echoes are tabulated for the period 1958 to 1962. The variation of echo rate with echo duration is studied. The difficulty of using this relation to determine the mass distribution of meteoroids in interplanetary space is noted.
Peter M. Millman, Bruce A. McIntosh
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Proceedings of the Physical Society, 1947
An investigation of short-duration radio echoes observed at 4 to 5 metres wavelength in the neighbourhood of the E region of the ionosphere is described. Observations by vertical beam radio equipments showed that the echoes occurred most frequently at a height of about 95 km.
J S Hey, G S Stewart
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An investigation of short-duration radio echoes observed at 4 to 5 metres wavelength in the neighbourhood of the E region of the ionosphere is described. Observations by vertical beam radio equipments showed that the echoes occurred most frequently at a height of about 95 km.
J S Hey, G S Stewart
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Techniques for Measuring Radar Meteor Speeds
Earth, Moon, and Planets, 2004We compare the results from the application of four different methods to determine the speed of meteoroids from single station radar data. The methods used are the pre-t 0 amplitude, post-t 0 amplitude, pre-t 0 phase and the Fresnel transform (FT) methods. Speeds from the first three methods are compared to the FT method since, requiring the use of the
W. J. Baggaley, J. Grant
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The Canadian Meteor Orbit Radar Meteor Stream Catalogue
Earth, Moon, and Planets, 2007The Canadian Meteor Orbit Radar is a multi-frequency backscatter radar which has been in routine operation since 1999, with an orbit measurement capability since 2002. In total, CMOR has measured over 2 million orbits of meteoroids with masses greater than 10 μg, while recording more than 18 million meteor echoes in total.
Peter Brown +3 more
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The French meteor radar facility
Journal of Atmospheric and Terrestrial Physics, 1978Abstract A brief history of the meteor radars developed by the National Center for Telecommunication Studies is followed by a description of the equipment and data analysis techniques. Details are given of the simultaneously measured radio meteor winds over Garchy, France (47°N, 3°E) and Kiruna, Sweden (68°N, 20°E) during August 1974, and over Garchy
M. Glass +3 more
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Radar Detection of Meteor Trails
Nature, 1946IN the course of ionospheric observations made during the International Polar Year 1932–33, a transient type of radio echo was observed from levels in the upper atmosphere about 100 km. above the ground. Such echoes were found to last only a second or two and were noted to be equally frequent both by day and by night.
EDWARD APPLETON, R. NAISMITH
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Antarctic meteor observations using the Davis MST and meteor radars
Advances in Space Research, 2008Abstract This paper presents the meteor observations obtained using two radars installed at Davis (68.6°S, 78.0°E), Antarctica. The Davis MST radar was installed primarily for observation of polar mesosphere summer echoes, with additional transmit and receive antennas installed to allow all-sky interferometric meteor radar observations.
Holdsworth, D. +3 more
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Radar Meteor Counts: Anomalous Increase during 1963
Science, 1964Radar meteor counts at Ottawa, Canada, show an increase of up to 50 percent in the hourly rates of short-duration echoes during the middle months of 1963. A similar increase has been observed in the Southern Hemisphere.
B A, McIntosh, P M, Millman
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Meteor radar observations at Kyoto University
Journal of Atmospheric and Terrestrial Physics, 1979Abstract A brief description of a coherent-pulse Doppler radar system recently installed at Kyoto and some initial results obtained with it are presented. The solar semidiurnal tide generally dominates the wind oscillations at these heights, while a diurnal tide of comparable magnitude reveals itself in a less regular manner.
T. Aso, T. Tsuda, S. Kato
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Conjuring Radar Meteor Head-Echoes
2018 2nd URSI Atlantic Radio Science Meeting (AT-RASC), 2018The argument surrounding under-dense vs. over-dense radar meteors has raged for decades. Here we consider the head-echo case by the noting that the two limiting scattering regimes for the same radar (scattering) cross-section (RCS) are each easily described.
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