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| Titel |
Radiant measurement accuracy of micrometeors detected by the Arecibo 430 MHz Dual-Beam Radar |
| VerfasserIn |
D. Janches, M. C. Nolan, M. Sulzer |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 4, no. 3 ; Nr. 4, no. 3 (2004-04-15), S.621-626 |
| Datensatznummer |
250001702
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| Publikation (Nr.) |
 copernicus.org/acp-4-621-2004.pdf |
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| Zusammenfassung |
| Precise knowledge of the angle between the meteor vector velocity and the
radar beam axis is one of the largest source of errors in the Arecibo
Observatory (AO) micrometeor observations. In this paper we study ~250
high signal-to-noise ratio (SNR) meteor head-echoes obtained using the
dual-beam 430 MHz AO Radar in Puerto Rico, in order to reveal the
distribution of this angle. All of these meteors have been detected first by
the radar first side lobe, then by the main beam and finally seen in the side
lobe again. Using geometrical arguments to calculate the meteor velocity in
the plane perpendicular to the beam axis, we find that most of the meteors
are travelling within ~15° with respect to the beam axis, in
excellent agreement with previous estimates. These results suggest that
meteoroids entering the atmosphere at greater angles may deposit their
meteoric material at higher altitudes explaining at some level the missing
mass inconsistency raised by the comparisson of meteor fluxes derived from
satellite and traditional meteor radar observations. They also may be the
source of the observed high altitude ions and metalic layers observed by
radars and lidars respectively. |
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