Search academic texts

Information × Registration Number 0204U003174, 0101U002789 , R & D reports Title Investigations of physical properties on surfaces and in atmospheres of planets popup.stage_title Head Korokhin V., Registration Date 16-02-2004 Organization Kharkov National University named after V.N.Karazin popup.description2 Objects of investigations are the Moon, Jupiter, aerosol and dust particles of Solar system.Goal of the work is research of optical properties of planets atmospheres and surfaces, development of theory of light scattering by systems of interacting scatterers.Methods of investigation are photometrical and polarimetrical, using theoretical analysis of data, theoretical and digital modeling the processes of light scattering on planets surfaces.Polarimetric observations of lunar surface for 23 phase angles (from 8° to 123°) were carried out. The maps of positive polarization degree maximum and its phase angle for leff=461 nm and leff=669 nm for the east semisphere have been constructed. The last one has been obtained for the first time.The maps of specropolarimetric index of polarization degree maximum Cp=Pmax(669 nm)/Pmax(461 nm) and amax(669 nm)/amax(461 nm) have been constructed also.The analysis of relationships between various optical parameters of lunar surface was carried out. It was established that amax - diffuse albedo m dependence shows significant linear anticorrelation. amax - Pmax dependence has nonlinear character. Correlation diagram specropolarimetric index Cp=Pmax(669 nm)/Pmax(461 nm) - albedo has typical fork-like shape: there is anticorrelation for mares and correlation for highlands.On the base of large quantity of observational material more precise empirical Akimov's formula has been obtained. A value of parameter n, appearing in it, for the main types of lunar surface has been found. Also it is shown that the albedo practically does not influence on the law of light distribution over lunar disk, and this distribution is determinated only by surface relief.The 20-years series of Jupiter photopolarimetric observations was continued by observations of 2000, 2001 and 2003 years. The obtained values of the north-south asymmetry of linear polarization degree are:-0.85±0.36? (2000), -1.15±0.28? (2001) and 1.04±0.56? (2003).The first approach of the model of light polarization by reflection onthe Jupiter stratosphere aerosol haze particles has been made. The first results of the modeling show a good qualitative agreement with observations.The researching of the Jupiter atmosphere light reflection law was made to study the thin effects in the Jupiter atmosphere. The chosen linear combination of the Lambert and Lommel-Seeliger laws gives a good approximation with errors smaller than 3 The program complex "IRIS" for processing and analysis of big arrays of photometric and polarimetric data has been greatly developed and improved.The software for objective cluster analysis of photopolarimetric data on the basis of modified ISOMAT method has been developed.The formulas of transformation between coordinates on image plane, planetocentric and photometric coordinates for the planets of arbitrary shapes have been obtained.The new algorithms of CCD-data primary processing have been developed. It allows to increase measurements precision significantly. A modernization of electronic part of photopolarimeter "x_CCD" has been carried out.The opposition effects for semi-infinite rare media are considered. Theirs dependencies from concentration and scatterers properties are studied. The near-fields effects are illustrated on examples of light scattering by chaotically oriented clusters of spherical particles.Candidate's degree thesis (Velikodsky, 2002), two master's degree works (Goryunova, Shalygin, 2003), two bachelor's degree works (Goryunova, Shalygin, 2002) and one term paper (Goryunova, 2001) have been defended on the basis of the researches. Product Description popup.authors popup.nrat_date 2020-04-02 Close