Multistatic Specular Meteor Radar Network in Peru: System Description and Initial Results
Multistatic Specular Meteor Radar Network in Peru: System Description and Initial Results
复制标题
秘鲁多基地镜面流星雷达网络：系统描述和初步结果
DOI：
10.1029/2020ea001293
复制
发表时间：
2020
影响因子：
3.1
通讯作者：
P. Erickson
中科院分区：
文献类型：
--
作者：
J. Chau;J. M. Urco;J. Vierinen;B. Harding;M. Clahsen;Nico Pfeffer;K. Kuyeng;M. Milla;P. Erickson
中层和低热层（MLT）区域在全球范围内由各种尺度的动力学主导：行星波，潮汐，重力波和分层湍流。后两者可以共存，并且在水平尺度小于500公里的情况下很重要，而这种尺度很难测量。这项研究介绍了最近部署的多基地镜面流星雷达系统，SIMONE秘鲁，它可以用来观察这些规模。雷达位于磁赤道的希卡马卡射电天文台及其周围。除了提供典型报道的大尺度特征的初步结果外，如低纬度地区的主导日潮汐，我们还展示了使用两种方法获得的空间和时间分辨风的选定日期的结果：（a）平均风及其梯度的估计（梯度法），以及（B）Tikhonov正则化的逆理论（正则化风场反演方法）。梯度法可以改进MLT垂直速度，并首次改进低纬度风场参数，如水平散度和相对涡度。正则化风场反演方法允许估计观测区域内的空间结构，并且具有优于梯度方法的潜力，特别是当更多的检测可用时，或者当进行正则化因子的自适应微调时。SIMONE秘鲁卫星为目前缺乏的MLT连续观测能力增加了低纬度的重要信息。结果有助于在不同尺度的MLT动力学的研究固有地连接到低大气强迫和E-区域发电机相关的电离层变化。
The mesosphere and lower thermosphere (MLT) region is dominated globally by dynamics at various scales: planetary waves, tides, gravity waves, and stratified turbulence. The latter two can coexist and be significant at horizontal scales less than 500 km, scales that are difficult to measure. This study presents a recently deployed multistatic specular meteor radar system, SIMONe Peru, which can be used to observe these scales. The radars are positioned at and around the Jicamarca Radio Observatory, which is located at the magnetic equator. Besides presenting preliminary results of typically reported large‐scale features, like the dominant diurnal tide at low latitudes, we show results on selected days of spatially and temporally resolved winds obtained with two methods based on: (a) estimation of mean wind and their gradients (gradient method), and (b) an inverse theory with Tikhonov regularization (regularized wind field inversion method). The gradient method allows improved MLT vertical velocities and, for the first time, low‐latitude wind field parameters such as horizontal divergence and relative vorticity. The regularized wind field inversion method allows the estimation of spatial structure within the observed area and has the potential to outperform the gradient method, in particular when more detections are available or when fine adaptive tuning of the regularization factor is done. SIMONe Peru adds important information at low latitudes to currently scarce MLT continuous observing capabilities. Results contribute to studies of the MLT dynamics at different scales inherently connected to lower atmospheric forcing and E‐region dynamo related ionospheric variability.