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- Title
Radar Backscatter from Underdense Meteors and Diffusion Rates.
- Authors
Werner Singer; Ralph Latteck; Luis Millan; Nick Mitchell; Jens Fiedler
- Abstract
Abstract  Many meteoroids burn up between about 120 km and 70 km, deposit metals and dust and form ionized trails which are detected by radars. Model studies about the influence of neutral or positively charged background dust on the ambipolar diffusion indicate that significant smaller decay times should be observed for weak meteor echoes compared to strong meteor echoes which can affect the estimation of temperatures. The variation of meteor decay times in dependence on echo strength, height, and season was studied using radar observations at 69° N, 22° S, and 67° S. Significantly reduced decay times were found for weak echoes below about 88 km at low latitudes throughout the year, and at high latitudes with the exception of summer. In summer at high latitudes, decreasing decay times of weak and strong meteors are observed at altitudes below about 85 km during the appearance of noctilucent clouds. The impact of reduced decay times on the estimation of neutral temperatures from decay times is discussed.
- Subjects
ASTRONOMY; METEORS; SOLAR system; METEOROLOGICAL optics
- Publication
Earth, Moon & Planets, 2008, Vol 102, Issue 1-4, p403
- ISSN
0167-9295
- Publication type
Article
- DOI
10.1007/s11038-007-9220-0