http://dspace.nbuv.gov.ua:80/handle/123456789/114707 2026-04-18T06:53:52Z http://dspace.nbuv.gov.ua:80/handle/123456789/119613 The discrete dipole approximation code DDscat.C++: features, limitations and plans Choliy, V.Ya. We present a new freely available open-source C++ software for numerical solution of the electromagnetic waves absorption and scattering problems within the Discrete Dipole Approximation paradigm. The code is based upon the famous and free Fortan-90 code DDSCAT by B. Draine and P. Flatau. Started as a teaching project, the presented code DDscat.C++ differs from the parent code DDSCAT with a number of features, essential for C++ but quite seldom in Fortran. This article introduces the new code, explains its features, presents timing information and some plans for further development. 2013-01-01T00:00:00Z http://dspace.nbuv.gov.ua:80/handle/123456789/119612 Telescope inaccuracy model based upon satellite laser ranging data Zhaborovskyy, V.P.; Pap, V.O.; Medvedsky, M.M.; Choliy, V.Ya. In this paper, a new approach to constructing a telescope pointing model is described. Procedures of data collection, data processing, and model construction are presented. Telescope encoder countings, obtained during satellite laser ranging, are used as input data for the construction of the model. The model is presented as a harmonical series with frequencies obtained by the maximum entropy spectral analysis method. 2013-01-01T00:00:00Z http://dspace.nbuv.gov.ua:80/handle/123456789/119611 Damping of magnetospheric toroidal Alfvén eigenmodes due to phase mixing Cheremnykh, S.O.; Parnowski, A.S. We demonstrate that toroidal shear Alfvén eigenmodes in dipolar magnetostatic plasma equilibrium are subject to damping due to phase mixing. This result is of particular interest for the investigation of Pc5-6 geomagnetic pulsations. 2013-01-01T00:00:00Z http://dspace.nbuv.gov.ua:80/handle/123456789/119610 Vortex and ULF wave structures in the plasma sheet of the Earth magnetosphere Saliuk, D.A.; Agapitov, O.V. We studied the ULF wave packet propagation in the Earth plasma sheet making use of the magnetic field measurements from FGM detector and plasma properties from CORRAL detector aboard the Interball-Tail spacecraft. The MHD vortex structures were observed simultaneously with the Pc5 ULF waves. The vortex spatial scale was found to be about 1200-3600 km and the velocity is 4-16 km/s transverse to the background magnetic field. We studied numerically the dynamics of the initial vortex perturbations in the plasma system with parameters observed in the Earth plasma sheet. The system with the vector nonlinearity was processed making use of the full reduction scheme. The good agreement of the experimental value of the vortex structure velocity with numerical results was obtained. The velocity was found to be close to the local plasma drift velocity. 2013-01-01T00:00:00Z