Mesosphere and Lower Thermosphere Changes Associated With the 2 July 2019 Total Eclipse in South America Over the Andes Lidar Observatory, Cerro Pachon, Chile
Mesosphere and Lower Thermosphere Changes Associated With the 2 July 2019 Total Eclipse in South America Over the Andes Lidar Observatory, Cerro Pachon, Chile
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DOI：
10.1029/2021jd035064
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发表时间：
2022-05
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影响因子：
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通讯作者：
Cerro Pachon;F. Vargas;A. Liu;G. Swenson;C. Segura;P. Vega;J. Fuentes;D. Pautet;M. Taylor;Y. Zhao;Y. Morton;H. Bourne
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作者：
Cerro Pachon;F. Vargas;A. Liu;G. Swenson;C. Segura;P. Vega;J. Fuentes;D. Pautet;M. Taylor;Y. Zhao;Y. Morton;H. Bourne
本文介绍了2019年7月2日智利日全食前后一周的观测结果。这次日食发生在世界协调时19时22分至21时46分之间，并于协调世界时20时38分至20时40分(当地时间16时38分至16时40分)在安第斯激光雷达观测站(30.3°S，70.7°W)上空完全遮盖太阳。使用ALO仪器进行了观测，目的是观察日食对中间层和较低热层区域(高度75-105公里)可能产生的影响。为了补充我们的数据集，我们还利用了在拉塞雷纳大学胡安·索尔达多天文台进行的定时/军刀温度和电离层电子密度测量。观测到的事件包括气辉图像中异常快速的弓形重力波结构、中间层温度映射器亮度以及激光雷达温度，水平波长为150公里，观测周期为24分钟，垂直波长为25公里。此外，流星雷达扫描到的100公里以上的强纬向风切变，以及从电离层探空仪测量到的100公里左右零星的E层的出现。最后，在激光雷达数据中看到了温度和密度的变化以及98公里附近零星下降的钠层的存在。我们讨论了MLT中日食的影响，这可以揭示这类事件期间的一组稀疏测量数据。我们的结果指出了与日食相关的大气变化的几个影响，这些变化在MLT下面和上面，但不是直接在MLT内。
This article presents the results of a week of observations around the 2 July 2019, total Chilean eclipse. The eclipse occurred between 19:22 and 21:46 UTC, with complete sun disc obscuration at 20:38–20:40 UTC (16:38–16:40 LT) over the Andes Lidar Observatory (ALO) at (30.3°S, 70.7°W). Observations were carried out using ALO instrumentation with the goal to observe possible eclipse‐induced effects on the mesosphere and lower thermosphere region (MLT; 75–105 km altitude). To complement our data set, we have also utilized TIMED/SABER temperatures and ionosonde electron density measurements taken at the University of La Serena's Juan Soldado Observatory. Observed events include an unusual fast, bow‐shaped gravity wave structure in airglow images, mesosphere temperature mapper brightness as well as in lidar temperature with 150 km horizontal wavelength 24 min observed period, and vertical wavelength of 25 km. Also, a strong zonal wind shear above 100 km in meteor radar scans as well as the occurrence of a sporadic E layer around 100 km from ionosonde measurements. Finally, variations in temperature and density and the presence of a descending sporadic sodium layer near 98 km were seen in lidar data. We discuss the effects of the eclipse in the MLT, which can shed light on a sparse set of measurements during this type of event. Our results point out several effects of eclipse‐associated changes in the atmosphere below and above but not directly within the MLT.