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Evaluation of estimated mesospheric temperatures from 11-year meteor radar datasets of King Sejong Station (62°S, 59°W) and Esrange (68°N, 21°E)

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Title
Evaluation of estimated mesospheric temperatures from 11-year meteor radar datasets of King Sejong Station (62°S, 59°W) and Esrange (68°N, 21°E)
Other Titles
세종기지와 Esrange 유성레이더 11년 자료를 활용한 중간권 온도 추정법 평가
Authors
Kam, Hosik
Kim, Yong Ha
Mitchell, Nicholas J.
Kim, Jeong-Han
Lee, Changsup
Subject
Geochemistry & Geophysics; Meteorology & Atmospheric Sciences
Keywords
Esrange; King Sejong Station; ambipolar diffusion; mesospheric temperature; meteor radar
Issue Date
2019-12
Citation
Kam, Hosik, et al. 2019. "Evaluation of estimated mesospheric temperatures from 11-year meteor radar datasets of King Sejong Station (62°S, 59°W) and Esrange (68°N, 21°E)". JOURNAL OF ATMOSPHERIC AND SOLAR-TERRESTRIAL PHYSICS, 196(1): 105148-105148.
Abstract
We have evaluated the reliability of two methods for estimating mesospheric temperatures from all-sky VHF meteor radar data. The first method utilizes the decay time of meteor trails, and the other method takes advantage of the linear relation between temperatures and the full width at half maximum (FWHM) of the observed meteor echoes height distribution. We estimated the temperatures from two meteor radar datasets of King Sejong Station (62.22°S, 58.78°W), Antarctic and Esrange, Sweden (67.90°N, 21.10°E) during a period of 2007 to 2017 and 2003 to 2013, respectively. We devised an improved decay time method of temperature estimation that utilizes careful selection of detected echoes by reflecting seasonal change in height range where ambipolar diffusion is dominant in meteor decay. Applying the improved method, we achieved temperature estimation on average within 6.2 and 5.4% from Aura/MLS temperatures at 90 km at Esrange and KSS, respectively. In comparison, temperatures estimated by the FWHM method have averaged differences of 5.1 and 3.6% from the MLS temperatures at Esrange and KSS, respectively. The FWHM temperatures show significantly less discrepancy from MLS temperatures and temporal fluctuations than the temperatures estimated by the decay time for both sites. This may indicate that the FWHM method is more robust to estimate mesospheric temperatures from meteor radar data.
URI
https://repository.kopri.re.kr/handle/201206/10994
DOI
http://dx.doi.org/10.1016/j.jastp.2019.105148
Appears in Collections  
2019-2019, Understanding polar upper atmospheric changes by energy inputs from the space environment and the lower atmosphere (19-19) / Jee, Geonhwa (PE19020)
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