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Mesospheric temperatures estimated from the meteor decay times over King Sejong Station(62.2°S, 58.8°W), Antarctica

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Title
Mesospheric temperatures estimated from the meteor decay times over King Sejong Station(62.2°S, 58.8°W), Antarctica
Other Titles
남극 세종과학기 유성레이더 관측으로부터 중간권 온도 추정연구
Authors
Jee, Geonhwa
Kim, Yong Ha
Kim, Jeong-Han
Keywords
Antarctica; Mesospheric temperature; Meteor radar
Issue Date
2010
Citation
Jee, Geonhwa, Kim, Yong Ha, Kim, Jeong-Han. 2010. Mesospheric temperatures estimated from the meteor decay times over King Sejong Station(62.2°S, 58.8°W), Antarctica. American Geophysical Union. American Geophysical Union. 2010.12.16~.
Abstract
A VHF meteor radar has ben operated at King Sejong Station (62.2°S, 58.8°W), Antarctica since March 2007 for the observations of the neutral winds in the mesosphere and lower thermosphere region. In addition, the radar observation allows usto estimate the neutral temperature from the measured meteor decay times of the meteor echoes by utilizing Hockings method (Hocking, 1999). For this temperature estimation, the meteor echoes observed from March 2007 to July 2009 were divded, for the first time, into weak and strong echoes depending on the strength of estimated relative electron line densities. The estimated temperatures are then compared the temperature measurements from the spectral airglow temperature imager (SATI) which has also been operated at the same location since 2002. The estimated temperatures from strong echoes were significantly lower than the temperatures estimated from weak echoes by on average about 31 K. As was done in most previous studies, we also derived the temperature by using all echoes without dividing into weak and strong, which produces about 10 K lower than the weak echoes. Among these hree estimated temperatures, the one from weak echoes was most similar to the SATI temperature. This result indicates that the strong echoes tend to reduce the estimated temperature and therefore need to be removed in the estimation procedure. We will also present the comparison of the estimated temperature with other measurements, for example, from the TIMED/SABER instrument and the NRLMSISE- 00 empirical model results as a further validation.
URI
http://repository.kopri.re.kr/handle/201206/8525
Conference Name
American Geophysical Union
Conference Place
American Geophysical Union
Conference Date
2010.12.16~
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