The hyperthermal ionization and high absolutemeteor velocities observed with HPLA radars

Details The hyperthermal ionization and high absolutemeteor velocities observed with HPLA radars The hyperthermal ionization and high absolutemeteor velocities observed with HPLA radars

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004em%26p...95..627p&link_type=abstract

Earth, Moon, and Planets, Volume 95, Issue 1-4, pp. 627-632

Physics

Hpla, Hyperthermal Ionization, Meteors, Velocities

Scientific paper

High Power Large Aperture (HPLA) radars generally observe very high meteor velocities averaging over 50 km s-1. There are only a few events recorded around 30 km s-1, while meteors at 20 km s-1 or slower are very rare. This is a clear and debated contradiction to specular meteor radar results. A high plasma density condition contributes, but the dominating phenomenon is the hyperthermal ionization mechanism due to chemical dynamics of the ionization process. The observed high velocities can be explained in terms of high hyperthermal ionization cross-sections for collisions between ablated meteoroid metal atoms such as Na and/or Fe and atmospheric species.

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