Pranke J B, Christensen A B, Morse F A, Hickman D R, Chater W T, Howey C K, Jones D A
Aerospace Corporation, Space Sciences Laboratory, P.O. Box 92957, Los Angeles, California 90009, USA.
Appl Opt. 1982 Nov 1;21(21):3941-52. doi: 10.1364/AO.21.003941.
A concave grating Wadsworth spectrometer designed to scan the UV limb of the earth was flown on a Defense Department meteorological satellite to obtain measurements of atmospheric emissions in the 85-395-nm wavelength range as a function of height above the solid earth. The instrument field of view was 0.14 x 3.8 degrees corresponding to 6 km in the vertical and 230 km in the horizontal at the limb. The scanning motion was controlled by a momentum compensated dc-torque motor mechanism that panned the line of sight across the limb corresponding to tangent altitudes of 80-480 km. A set of three photon counting detectors, each viewing a separate exit slit, provided simultaneous coverage of the wavelength bands of 85-120 nm (EUV), 110-163 nm (far UV), and 290-395 nm (UV) at a wavelength resolution of 0.4, 0.8, and 1.2 nm, respectively. A separate photometric channel isolated the atmospheric sodium doublet at 589.0-589.6 nm. The grating position and instrument view angle were controlled by digital circuitry operating on hardwired and uplinked command instructions. The operating modes included a variety of scanning and fixed wavelength and view angle operations. A description of the instrument and several examples of the data are presented. These include the dayglow emissions from thermospheric oxygen and nitrogen that form the basis of a thermospheric density determination, auroral enhancements observed in these emissions and in hydrogen Ly-alpha, and nighttime sodium emissions.
一台用于扫描地球紫外边缘的凹面光栅沃兹沃思光谱仪搭载在国防部气象卫星上，以获取85 - 395纳米波长范围内大气发射随距固体地球高度变化的测量数据。仪器视场为0.14×3.8度，对应于边缘处垂直方向6千米和水平方向230千米。扫描运动由一个动量补偿直流扭矩电机机构控制，该机构使视线扫过对应切线高度为80 - 480千米的边缘。一组三个光子计数探测器，每个探测器观察一个单独的出射狭缝，分别以0.4、0.8和1.2纳米的波长分辨率同时覆盖85 - 120纳米（极紫外）、110 - 163纳米（远紫外）和290 - 395纳米（紫外）的波段。一个单独的光度通道分离出589.0 - 589.6纳米处的大气钠双线。光栅位置和仪器视角由基于硬连线和上行链路指令操作的数字电路控制。操作模式包括各种扫描、固定波长和视角操作。文中介绍了该仪器的描述及一些数据示例。这些包括热层氧和氮的日辉发射，它们是热层密度测定的基础；在这些发射以及氢莱曼α线中观测到的极光增强；以及夜间钠发射。
