Subjects: Geosciences >> Space Physics submitted time 2017-03-10
Abstract：为了满足大气微量成分高精度测量需求，要求准确描述星载高光谱大气微量成份探测仪的仪器狭缝函数，针对高光谱大气微量成份探测仪视场大、波段宽、空间分辨率和光谱分辨率高等特点，研制了狭缝函数测量仪。本文首先介绍了狭缝函数测量仪的工作原理，接着利用狭缝函数测量仪可同时实现高分辨率、宽谱段测量的特点，对高光谱大气微量成份探测仪进行全视场的狭缝函数测试，给出仪器狭缝函数特性分布，并对结果进行分析。测试结果表明：高光谱大气微量成份探测仪的狭缝函数特性曲线近似满足高斯分布规律，由于星载大视场成像光谱仪存在光谱弯曲现象，导致边缘视场分辨能力略低于中心视场分辨能力，高光谱大气微量成份探测仪全视场光谱分辨率优于0.6nm。
Peer Review Status:
Awaiting Review
Subjects: Geosciences >> Space Physics submitted time 2017-03-10
Abstract：光谱定标是仪器遥感数据定量化的前提和基础，针对星载大气微量成分探测仪视场大、波长 宽、空间分辨率和光谱分辨率高的特点，建立了基于中阶梯衍射光栅的光谱定标装置。中阶梯光栅 因其较少的线密度和较大的闪耀角工作在较高的闪耀级次，光谱范围宽且具有较高的分辨率，可在 工作波段内一次性输出多条分布较为均匀的谱线，克服了传统定标方式的缺点，提高了定标精度。 本文首先介绍了光谱定标装置的工作原理，接着利用该装置对高光谱大气微量成份探测仪进行光谱 定标，通过寻峰和回归分析给出载荷的光谱定标方程，并利用标准汞灯谱线对定标结果进行检验。 结果表明：高光谱大气微量成份探测仪的像元和波长近似满足线性分布规律，定标不确定度为 0.0258nm，汞灯特征谱线的定标值和标准值偏差最大不超过0.0435nm，证明了定标结果的准确性。
Peer Review Status:Awaiting Review
Subjects: Geosciences >> Space Physics submitted time 2016-12-26
Abstract：FY-3气象卫星上搭载的紫外臭氧总量探测仪TOU是我国自主开发研制的首台用于全球臭氧总量定量测量的探测仪，自发射以来已成功在轨运行近两年。由于TOU发射前辐亮度定标存在偏差，为了得到高精度的产品，TOU必须进行在轨定标。本文介绍了基于辐射传输模式计算对TOU辐亮度进行在轨道定标的方法，定标过程中用于模拟辐亮度计算的臭氧总量由与TOU观测时刻相近的国外臭氧总量探测仪器MetOp/GOME-2提供。文章将在轨定标后TOU的反演结果与AURA/OMI以及地基的产品进行比较，研究结果表明，用辐射传输模式对TOU辐亮度进行在轨定标的方法是可行的，反演结果能够真实的反映臭氧的时空分布特性，在全球部分地基观测站所处的位置上对TOU, OMI以及地基的臭氧总量进行比较的结果表明，TOU与OMI的相对偏差均方根约为2.52%， TOU与地基以及OMI与地基观测结果之间的相对偏差均方根分别为4.45%和3.89%。
Peer Review Status:Awaiting Review
Subjects: Geosciences >> Space Physics submitted time 2016-05-13
Abstract： Sprites are the transient luminous events above very active thunderstorms and are the direct evidence of the energy in troposphere coupled to the upper atmosphere. The emissive spectrum study is the important means to understand the energy injected into upper atmosphere and regional ionization, the electron energy distribution during the whole event. These parameters are useful for the study of sprites' physical mechanism, in addition as a kind of natural atmospheric luminous phenomenon, the emissive spectrum study is useful for providing important information to the research of atmospheric radiation background information. Based on the Boltzmann Equation to calculate the time evolution of the electron energy distribution function in a mixture of partially ionized gases with an applied electric field, the paper calculated the spectral intensity in typical emissive band for sprites. Simulation results show that the emissive intensity is more intensive with more intensive E/N and the emissive spectrum is from far ultraviolet to near infrared.
Peer Review Status:Awaiting Review
Subjects: Geosciences >> Space Physics submitted time 2016-05-13
Abstract： The middle lightning phenomena is a key topic in the middle and upper atmosphere.In this dissertation,its emissive spectral is studied by numerical simulation.On the base of the quasi-electrostatic(QE)field excitating mechanism,the quasielectrostatic field distribution with height caused by a sudden discharge of thunderstorm cloud is calculated by single point charge model.The reduced E-field(E/N,where E is the quasielectrostatic field intensity and N is the neutral density)is inputted into the Boltzmann equation function for the electron energy distribution with time in a mixture of partially ionized gases.The excitation rate corresponding to the collisional process as a function of reduced E-field is calculated.On the base of the calculations the volume emissive rate for each emissive band is calculated,then the volume emissive rate is inputted into the atmophere radiative transfer function to obtain the radiative intensity with wavelength.Example for the excitation calculated when E/N=200Td,the radiative intensity produced thousands of rayleighs.The spectral distribution is relative to the atmospheric composition and dectection path.
Peer Review Status:Awaiting Review
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