In this paper, we study the interaction between a nighttime Medium Scale Traveling Ionospheric Disturbance (MSTID) and geomagnetic north-south oriented field-aligned plasma depletion structure over Hanle, Leh Ladakh (32.7°N, 78.9°E; Mlat. ~24.1°N), India on a geomagnetically quiet night (06 May 2019, Ap = 4). The results are based on the observations carried out using a newly established airglow imager operating at 630.0 nm at Hanle which is a transition region of geomagnetic low-mid latitudes. A sequence of processes constituted this unique interaction that includes developing phase of the MSTID within the imager's field of view, gradual bending of the field-aligned plasma depletion structure and eventual merging with the MSTID, and propagation of the merged structure in the form of a single MSTID structure post-interaction. The mechanism appears to be controlled by unequal but oppositely directed polarization electric fields within the dark and bright bands of the developing MSTID, whose projection on the horizontal plane is observable in the airglow images. The present work is the first observation illustrating the interaction between a developing phase of MSTID and plasma depletion structure over a geomagnetic low-mid latitude transition region, which assumes importance for understanding the underlying plasma irregularity processes.

在本文中，我们研究了夜间中尺度电离层扰动（MSTID）与Leh Ladakh汉勒（32.7°N，78.9°E; Mlat。〜24.1° N），印度在地磁安静的夜晚（2019年5月6日，Ap = 4）。结果是基于使用新建立的气辉成像仪进行的观测结果，该成像仪在Hanle（地磁低中纬度的过渡区域）处以630.0 nm运行。一系列的过程构成了这种独特的相互作用，包括成像器视场内MSTID的显影阶段，场对准的等离子体耗尽结构的逐渐弯曲以及最终与MSTID的合并，以及合并结构的扩散形式为MSTID。单个MSTID结构交互后。该机制似乎受正在发展的MSTID的暗区和亮区中不相等但方向相反的极化电场控制，该电场在气辉图像中可观察到在水平面上的投影。目前的工作是首次观察到，说明了MSTID发育阶段与地磁低中纬度过渡区域上的等离子体耗竭结构之间的相互作用，这对于理解潜在的等离子体不规则过程具有重要意义。