A method for capturing the shape and location of the sun onoccurrence of solar occultation

摘要

A method for capturing the solar shape and location on occurrence of solar occultation is presented. On occurrence ofoccultation when the Sun is covered by atmosphere, the solar shape viewed by satellite-borne detector on certain orbitthrough atmosphere at different heights varies greatly due to such factor as the in homogeneity of atmosphere and cloudcovering, etc. During the varying of heights of atmosphere, the gray image of Sun also changes, which even appearsseveral parts in different size due to the disturbance of cloud layer. Based on which, the Paper proposes a method forcapturing solar shape and intensity on occurrence of solar occultation. First, taking the solar grey image withoutatmospheric refraction effects as a reference; then the refraction angle of Sun ray after being refracted by atmosphere canbe reversely calculated by using Abel integral function and the vertically distributed data of index of refraction; Last, thesolar shape after passing atmosphere can be obtained by calculating the refraction angle of the ray on solar limb. Wehave obtained the image of solar shape and intensity at the occultation central point of contact from 5km to 60km whenthe detector is located at the defined satellite orbit (600km) by simulation. This method is of great significance forrealizing the solar simulator which can reflect solar shape and intensity in a comparatively truly degree under thecircumstance of existing various affecting factors for application in the fields like measuring and calibration of postureparts of satellite, remote sensing technology and material measure, etc.© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.