CEDAR: ALOHA/ANLC-93; Airglow Imaging Studies

这项建议涉及大气气辉的研究， 使用NCAR的宽视场成像仪进行的对流云（ANLC） 用于ALOHA/ANLC-93战役的伊莱克特拉飞机。 相机将会 为包括激光雷达在内的活动提供相关数据， 雷达和来自中间层上层的光谱信息 低热层区域。 运动的基本目标是 定位和研究与ANLC相关的地球物理条件， 重力波动力学和零星的钠层。 除了 为这些团队目标提供观察贡献， 重力波水平属性的具体研究 从这些数据中解析出来，并与 现有的数据集是在1991-92年的7个月期间收集的 在UT的熊湖，使用这里提出的相同仪器。 洛克希德公司已经开发并成功展示了在 几个地面战役，一个敏感的，裸露的CCD成像仪， 能够测量高信号的OH、O2、Na和OI夜光 噪声比。 特别地，使用宽带的OH成像 技术（7500-9300 >），已经在60秒内产生了50：1的S：N 曝光使用.35o像素（>.5 km分辨率开销）， 天空光学 在此灵敏度下， 已经观察到了百分之几的数量级。 数组是1024 X 1024（15.4mm X 15.4mm），比市售产品大4倍以上 迄今为止用于空气动力学研究的现有阵列。 系统 使用坚固耐用的商用电子设备（包括计算机） 并且对于飞机环境稳定。 协调性 与NCAR合作，在飞机上安装一个全天空圆顶， 适应全天空领域。 飞机俯仰和滚转稳定性 研究表明，对于典型的飞行， 条件下，可以在30秒内获得>.5o的角分辨率。 办妥了一批 宽视场摄像机将用于（1）记录 OH气辉层中的不规则性， 影响飞行层的大气重力波和潮汐 太阳高度角（SEA）-10o（即 （2）图像太阳能 在-6oSEA-8o的情况下， 在SEA>-6.5o的ANLC相的Na“钠闪光”成像， 支持零星钠层的研究。 意见（2）和 (3)在计划中的两次向北飞往极地的飞行中是可行的 章 利用OH图像，水平波长，强度 振幅、视水平相速度和空间范围 (up到500公里半径的飞机），将研究的目标 （一）. 将对图像进行谱密度分析， 解析水平重力波信息。 在ANLC 活动中，将试图提供对云的观测结果， ANLC的位置信息。 从Na 'flash'图像中，Na 密度将从图像反转。 为了一个非常特殊 位置（即SEA>-6.5o），Na柱密度将从 所述图像用于所述层的假定恒定太阳光照。

This proposal involves the study of atmospheric airglow and noctilucent clouds (ANLCs) with a wide field imager from the NCAR Electra aircraft for the ALOHA/ANLC-93 campaign. The imager will provide correlative data to the campaign which includes lidar, radar, and spectroscopic information from the Upper Mesosphere- Lower Thermosphere region. The basic campaign objectives are to locate and study the geophysical conditions associated with ANLCs, gravity wave dynamics, and sporadic Na layers. In addition to providing an observational contribution to these team goals, a specific study of the horizontal attributes of gravity waves resolved from these data will be performed and compared to an existing data set which was taken over a 7 month period in 1991-92 at Bear Lake, UT with the same instrument that is proposed here. Lockheed has developed and successfully demonstrated in several ground based campaigns, a sensitive, bare CCD imager capable of measuring OH, O2, Na, and OI nightglows with high signal to noise ratios. In particular, OH imaging using broad band techniques (7500-9300 >), have produced 50:1 S:N with 60 s exposures using .35o pixels (>.5 km resolution overhead) with all- sky optics. With this sensitivity, airglow intensity amplitudes on the order of a few percent have been observed. The array is a 1024 X 1024 (15.4mm X 15.4mm) which is >4x larger than the commercially available arrays used in aeronomical studies to date. The system uses commercial electronics (including a computer) which are rugged and stable for the aircraft environment. Coordination has been made with NCAR to install an all-sky dome on the aircraft to accommodate the all-sky field. Aircraft pitch and roll stability have been investigated to suggest that, for typical flight conditions, angular resolutions of >.5o over 30 seconds can be achieved. The wide field camera will be used to (1) document irregularities in the OH airglow layer which are caused by atmospheric gravity waves and tides affecting the layer for flight segments where the Solar Elevation Angle (SEA)-10o (which is the condition for most flight paths for the campaign); (2) image solar scattered illumination of noctilucent clouds where -6oSEA-8o for the ANLC phase; and (3) image the Na 'sodium flash' at SEA>-6.5o in support of the study of sporadic Na layers. Observations (2) and (3) are feasible on the two planned flights north into the polar cap. With the OH imagery, the horizontal wavelength, intensity amplitude, apparent horizontal phase velocity, and spatial extent (up to 500 km radius of the aircraft), will be studied in objective (1). Spectral density analysis will be performed on imagery to resolve the horizontal gravity wave information. In the ANLC campaign,m observations of the clouds will be attempted to provide information of ANLC's location. From Na 'flash' imagery, the Na density will be inverted from the image. For a very specific location (i.e. SEA>-6.5o) the Na column density will be derived from the image for an assumed constant solar illumination of the layer.