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)
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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DOI：
10.1016/j.jastp.2019.105148
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发表时间：
2019-12
影响因子：
1.9
通讯作者：
H. Kam;Y. Kim;N. Mitchell;Jeong‐han Kim;Changsup Lee
中科院分区：
文献类型：
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作者：
H. Kam;Y. Kim;N. Mitchell;Jeong‐han Kim;Changsup Lee
我们已经评估了两种方法的可靠性估计中层温度从全天空VHF流星雷达数据。第一种方法利用流星尾迹的衰减时间，而另一种方法利用温度与观测到的流星回波高度分布的半高宽（FWHM）之间的线性关系。利用2007-2017年和2003 - 2013年期间南极世宗国王站（62.22°S，58.78°W）和瑞典Esrange（67.90°N，21.10°E）的两个流星雷达数据集分别估计了温度。我们设计了一种改进的衰减时间的温度估计方法，利用仔细选择检测到的回波，反映季节性变化的高度范围内，双极扩散是占主导地位的流星衰减。应用改进的方法，我们实现了温度估计平均在6.2%和5.4%的Aura/MLS温度约90公里，在Esrange和KSS，分别。相比之下，用半高宽法估算的温度与欧洲探空火箭发射场和KSS的MLS温度的平均差异分别为5.1%和3.6%。的FWHM温度显示显着较小的差异，从MLS温度和时间波动比两个网站的衰变时间估计的温度。这可能表明，半高宽方法是更强大的流星雷达数据估计中间层温度。
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 2007–2017 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 around 90 km at Esrange and KSS, respectively. In comparison, temperatures estimated by the FWHM method have mean 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.