Modelling of the problem of satellite based UV-tomography of the ionosphereстатья
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Дата последнего поиска статьи во внешних источниках: 26 сентября 2016 г.
Аннотация:The results of the modelling of the direct and inverse problems of low-orbital satellite UV-tomography of volume emission rate of ionospheric OI 135.6 nm emission are presented. For the direct problem we used real geometries of the orbits of DMSP 5D3 satellites caring UV spectrometers SSUSI and SSULI, their scanning parameters (rate and angles) as well as the model distributions of volume emission rate containing irregularities of various scales. Thus, data obtained in direct problem were used for the reconstruction of the model of volume emission rate distribution. We used well developed in ionospheric radiotomography iterative algorithms ART and SIRT to solve obtained system of linear equations. We show that for successful reconstruction of the model the condition of the positiveness of the solution should be taken into account. Weight functions should be applied to decrease the solution in the areas where it is a priory small, as well as smoothing with decreasing at each iteration step parameter to neglect approximation errors. Taking these issues into account results in comparable computational costs for ART and SIRT algorithms with reconstruction errors ~ 6%. We also discuss the influence of random and systematic errors in input data on the reconstruction results. We show that parameters of algorithms can be adjusted on the stage of modelling for a given level of noise in input data to decrease the influence of noise of order of several percent on the reconstruction quality.