Multispectral and Multi‐instrument Observation of TIDs Following the Total Solar Eclipse of 21 August 2017
Multispectral and Multi‐instrument Observation of TIDs Following the Total Solar Eclipse of 21 August 2017
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2017 年 8 月 21 日日全食后 TID 的多光谱和多仪器观测
DOI：
10.1029/2018ja026333
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
S. Chakrabarti
中科院分区：
文献类型：
--
作者：
S. Aryal;G. Geddes;S. C. Finn;S. Mrak;I. Galkin;I. Cnossen;T. Cook;S. Chakrabarti
2017 年 8 月 22 日夜间，日全食发生后约 8 小时，观测到高层大气夜辉亮度中的波浪状结构。这些波状扰动是大气重力波和相关的行进电离层扰动（TID）的特征。 2017 年 8 月 22 日世界标准时间 2 点至 10 点，在伊利诺伊州卡本代尔的红线 (OI 630.0 nm) 和绿线 (OI 557.7 nm) 上进行了观测。根据小波分析，红线和绿线的主要时间段均为 1.5 小时左右。从伊利诺伊州卡本代尔的全球定位系统总电子含量测量获得的差分总电子含量数据以及从爱达荷国家实验室和米尔斯通山的数字探测器测量获得的电离层参数显示了类似的主导时间段。根据这些观测结果及其与地磁指数的相关性，TID 似乎与地磁扰动相关。此外，通过模拟电离层-热层系统对日食的响应，我们发现虽然日食在我们的观测期间增强了250 km处的O/N2比和电子密度（Ne），但它并没有影响TID。 TID 的垂直（7 m/s）和经向（616 m/s）相速度分别使用红线和绿线亮度分布之间的互相关分析以及微分总电子含量电图的光谱分析来估计。这提供了一种表征 TID 三维波特性的方法。
Wave‐like structures in the upper atmospheric nightglow brightness were observed on the night of 22 August 2017, approximately 8 hr following a total solar eclipse. These wave‐like perturbations are signatures of atmospheric gravity waves and associated traveling ionospheric disturbances (TIDs). Observations were made in the red line (OI 630.0 nm) and the green line (OI 557.7 nm) from Carbondale, IL, at 2–10 UTC on 22 August 2017. Based on wavelet analyses, the dominant time period in both the red and green lines was around 1.5 hr. Differential total electron content data obtained from Global Positioning System total electron content measurements at Carbondale, IL, and ionospheric parameters from digisonde measurements at Idaho National Laboratory and Millstone Hill showed a similar dominant time period. Based on these observations and their correlation with geomagnetic indices, the TIDs appear to be associated with geomagnetic disturbances. In addition, by modeling the ionosphere‐thermosphere system's response to the eclipse, it was seen that while the eclipse enhanced the O/N2 ratio and electron density (Ne) at 250 km during our observation period, it did not affect the TIDs. Vertical (7 m/s) and meridional (616 m/s) phase velocities of the TIDs were estimated using cross‐correlation analysis between red and green line brightness profiles and spectral analysis of the differential total electron content keogram, respectively. This provides a method to characterize the three‐dimensional wave properties of TIDs.
影响因子：
5.2
作者：
Mrak, Sebastijan;Semeter, Joshua;Sivadas, Nithin
通讯作者：
Sivadas, Nithin