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The effect of recombination and attachment on meteor radar diffusion coefficient profiles

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Title
The effect of recombination and attachment on meteor radar diffusion coefficient profiles
Other Titles
유성흔 확산 계수에서의 이온-전자 결합과 중성대기-전자 부착 효과
Authors
Lee, Changsup
Kim, Jeong-Han
Kim, Yong Ha
I. M. Reid
J. P. Younger
Subject
Meteorology & Atmospheric Sciences
Keywords
diffusion; meteors; radar; recombination
Issue Date
2013
Publisher
American Geophysical Union
Citation
Lee, Changsup, et al. 2013. "The effect of recombination and attachment on meteor radar diffusion coefficient profiles". JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 118: 3037-3043.
Abstract
Estimates of the ambipolar diffusion coefficient produced using meteor radar echo decay times display an increasing trend below 80-85 km, which is inconsistent with a diffusion-only theory of the evolution of meteor trails. Data from the 33 MHz meteor radar at King Sejong Station, Antarctica has been compared with observations from the Aura EOS MLS satellite instrument. It has been found that the height at which the diffusion coefficient gradient reverses follows the height of a constant neutral atmospheric density surface. Numerical simulations of meteor trail diffusion including dissociative recombination with atmospheric ions and three-body attachment of free electrons to neutral molecules indicate that three-body attachment is responsible for the distortion of meteor radar diffusion coefficient profiles at heights below 90 km, including the gradient reversal below 80-85 km. Further investigation has revealed that meteor trails with low initial electron line density produce decay times more consistent with a diffusion-only model of meteor trail evolution.he 33 MHz meteor radar at King Sejong Station, Antarctica has been compared with observations from the Aura EOS MLS satellite instrument. It has been found that the height at which the diffusion coefficient gradient reverses follows the height of a constant neutral atmospheric density surface. Numerical simulations of meteor trail diffusion including dissociative recombination with atmospheric ions and three-body attachment of free electrons to neutral molecules indicate that three-body attachment is responsible for the distortion of meteor radar diffusion coefficient profiles at heights below 90 km, including the gradient reversal below 80-85 km. Further investigation has revealed that meteor trails with low initial electron line density produce decay times more consistent with a diffusion-only model of meteor trail evolution.
URI
http://repository.kopri.re.kr/handle/201206/6115
DOI
http://dx.doi.org/10.1002/jgrd.50315
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