Coordinated Analysis of the Zonal Mean Circulation and Semidiurnal Tide in the Mesosphere and Lower-Thermosphere Using Ground Based Radar and TIMED Observations

作为这项提议的一部分，来自水平风场定时卫星的地面和TIDI观测将被用来估计半日潮的空间结构(纬度、经度和高度)和时间演变，包括迁移和非迁移，每月一次。这一努力的动力是双重的。首先，半日潮对MLT的结构有显著影响。然而，关于潮汐的潜在变化性以及这种变化性的可能来源，人们知之甚少。纵向变化的一个可能来源是非迁移性潮汐分量，这可能是低层大气的纬向不对称加热、非线性波-波相互作用或MLT的原地来源造成的。要解决变率问题，必须将由非迁移性潮汐分量引起的经向变率与源和传播效应分离，如准两年振荡，它可以改变迁移性半日潮的结构。为了实现这些研究目标，这项提议将利用21个地面流星和MF雷达系统的数据。这些数据将与定时TIDI测量一起收集和分析。作为这项提议的结果，每个站点将每4天提供一次地面平均和潮汐(24、12和8小时)估计。这些潮汐估计将与TIDI测量相结合，以提供对MLT中纬向平均环流、迁移性和非迁移性半日潮的估计。将努力整合本文未包括但也作为定时/雪松计划的一部分资助的站点的地面测量，以将这些结果扩展到其他纬度。

Palo, Scott EATM-0000956As part of this proposal both ground-based and TIDI observations from the TIMED satellite of the horizontal wind field will be used to estimate the spatial structure (latitude, longitude, and height) and temporal evolution of the semidiurnal tide, both migrating and non-migrating, on a monthly basis. The impetus for this effort is twofold. First, the semidiurnal tide has a significant influence on the structure of the MLT. However, little is understood about the underlying variability of the tide and the possible sources of this variability. One possible source of longitudinal variability is due to the non-migrating tidal components, which may result from zonally asymmetric heating in the lower-atmosphere, non-linear wave-wave interactions, or from in-situ sources in the MLT. To attack the problem of variability the longitudinal variability that results from the non-migrating tidal components must be separated from the source and propagation effects, such as the quasi-biennial oscillation, which can modify the structure of the migrating semidiurnal tide. To accomplish these research goals this proposal will utilize data from 21 ground-based meteor and MF radar systems. These data will be collected and analyzed in conjunction with the TIMED TIDI measurements. As a result of this proposal ground-based mean and tidal (24, 12, and 8 hour) estimates will be provided every 4 days from each station. These tidal estimates will be analyzed in conjunction with the TIDI measurements to provide an estimate of the zonal mean circulation, the migrating and non-migrating semidiurnal tides in the MLT on a monthly basis. An effort will be made to integrate ground-based measurements from stations not included herein but which are also funded as part of the TIMED/CEDAR program to extend these results to other latitudes.