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Meteor head echo radar data: Mass–velocity selection effects by S. Close; P. Brown; M. Campbell-Brown; M. Oppenheim; P. Colestock is a Physics and Astronomy article available to read on EtoBox.

What is Meteor head echo radar data: Mass–velocity selection effects about?

High-power, large-aperture (HPLA) radars detect the plasma that forms in the vicinity of a meteoroid and moves approximately at its velocity; reflections from these plasmas are called head echoes. For over a decade, HPLA radars have been detecting head echoes with peak velocity distributions >50 km/s. These results have created some controversy within the field of meteor physics because previous data, including spacecraft impact cratering studies, optical and specular meteor data, indicate that the peak of the velocity distribution to a set limiting mass should be <20 km/s [Love, S.G., Brownlee, D.E., 1993. Science 262, 550-553]. Thus the question of whether HPLA radars are preferentially detecting high-velocity meteors arises. In this paper we attempt to address this question by examining both modeled and measured head echo data using the ALTAIR radar, collected during the Leonid 1998 and 1999 showers. These data comprise meteors originating primarily from the North Apex sporadic meteor source. First, we use our scattering theory to convert measured radar-cross-section (RCS) to electron line density and mass, as well as to convert modeled electron line density and mass to RCS. We

Who reads Meteor head echo radar data: Mass–velocity selection effects?

Author

S. Close; P. Brown; M. Campbell-Brown; M. Oppenheim; P. Colestock

Publisher

Elsevier Science; Elsevier ; Elsevier Inc.; Elsevier BV; Oxford University Press (OUP) (ISSN 0019-1035)

Published

2007

Language

EN

Field

Physics and Astronomy (Physical Sciences)