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首页> 外文期刊>Journal of Geophysical Research, C. Oceans: JGR >Coordinated investigation of summer time mid-latitude descending e layer (E_s) perturbations using Na lidar, ionosonde, and meteor wind radar observations over Logan, Utah (41.7°N, 111.8°W)
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Coordinated investigation of summer time mid-latitude descending e layer (E_s) perturbations using Na lidar, ionosonde, and meteor wind radar observations over Logan, Utah (41.7°N, 111.8°W)

机译：使用犹他州洛根（41.7°N，111.8°W）上的Na激光雷达，离子探空仪和流星风雷达观测资料对夏季中纬度降e层（E_s）摄动进行协调研究

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It is well known that there is a strong correlation between the formation of a descending sporadic E layer (E_s) and the occurrence of large upper atmospheric zonal wind shears, most likely driven by solar thermal tides and/or gravity waves. We present new results of E_s perturbation events captured between 13 and 17 July 2011 (UT days 194-198) as part of a coordinated campaign using a wind/temperature Na lidar at Utah State University [41.7°N, 111.8°W], and a Canadian Advanced Digital Ionosonde (CADI; Scientific Instrumentation Ltd., Saskatoon, Saskatchewan, Canada) and SkiYMet meteor wind radar, both located at nearby Bear Lake Observatory [41.9°N, 111.4°W]. During this period, the CADI detected strong descending E _s on 2 days (195 and 197) when large modulations of the top-side mesospheric Na layer occurred in synchronism with strong oscillations in the ionosonde E region echoes. A weakening in the descending E layer echoes was observed on the other 2 days (196 and 198) coincident with a large reduction in the zonal diurnal and semidiurnal amplitudes above 95 km. Both tidal components were found to have comparable contributions to the total zonal wind shear that was critical for E_s formation and its downward propagation. Further investigation indicates that the weakening tidal amplitudes and the occurrence of the Es events were also influenced by a strong quasi-two-day period modulation, suggesting significant quasi-two-day wave (QTDW) interactions with the tides. Indeed, a nonlinear, wave-wave interaction-induced 16-hour period child wave was also detected, with amplitude comparable to that of the prevailing tides. These interaction processes and their associated effects are consistent with earlier Thermosphere Ionosphere Mesosphere Electrodynamics General Circulation Model studies of nonlinear interactions between the migrating tidal waves and the QTDW and were probably responsible for the observed damping of the tidal amplitudes resulting in the disruption of the E_s. Key PointsEs induces large perturbations of Na abundance in lower thermosphereE_s weakening is coincident with weakening of zonal wind tidesThe damping of tidal amplitude is the result of interaction between PW and Tide
机译：众所周知，下降的零星E层（E_s）的形成与大的高层大气纬向风切变的发生之间存在很强的相关性，这很可能是由太阳热潮和/或重力波驱动的。我们展示了在2011年7月13日至17日（UT天194-198）之间捕获的E_s扰动事件的新结果，这是在犹他州立大学使用风/温度Na激光雷达[41.7°N，111.8°W]进行的协调运动的一部分，以及加拿大先进数字离子探空仪（CADI;科学仪器有限公司，加拿大萨斯喀彻温省萨斯卡通）和SkiYMet流星风雷达，都位于附近的贝尔湖天文台[41.9°N，111.4°W]。在此期间，CADI在两天内（195和197）检测到强下降E _s，这是由于顶面中层Na层发生了较大的调制并与离子探空仪E区域回波的强烈振荡同步发生的。在其他两天（196和198）观察到下降的E层回波减弱，同时95 km以上的纬向日和半日振幅大幅减小。发现这两个潮汐分量对总的纬向风切变具有可比的贡献，这对E_s的形成及其向下传播至关重要。进一步的研究表明，减弱的潮汐振幅和Es事件的发生也受到强烈的准两日周期调制的影响，表明与潮汐有明显的准两日波相互作用。确实，还检测到了非线性的，由波波相互作用引起的16小时周期的子波，其幅度与当时的潮汐相当。这些相互作用过程及其相关影响与早期的热球电离层中层电动力学通用循环模型研究有关，即潮汐潮汐与QTDW之间的非线性相互作用，并且可能是由于观测到的潮汐振幅衰减导致E_s破坏所致。要点Es在较低的热圈中引起Na丰度的大扰动E_s减弱与纬向风潮减弱同时发生潮汐振幅的衰减是PW和潮汐相互作用的结果

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