Kozak Liudmyla

Abstract Reference: 30943
Identifier: P8.17
Presentation: Poster presentation
Key Theme: 8 Other

ANALYSIS OF SATELLITE FLUXGATE MAGNETIC FIELD MEASUREMENTS

Authors:
Kozak Liudmyla, Lui Anthony Tat Yin, Grigorenko Elena, Kronberg Elena, Prokhorenkov Andrew 

Statistical properties of magnetic field fluctuations in boundary regions of the Earth's magnetosphere at different timescales were considered. Data of fluxgate magnetic field measurements with high resolution (22.5 Hz) obtained by Cluster mission from 2004 to 2014 were used. Changes in the form and parameters of the probability density function have been studied for the periods when the satellite was in the solar wind plasma, different magnetosheath regions, and the Earth’s magnetosheeth. Variations in the probability density function maximum and the kurtosis value as characteristics of the turbulence property evolution on different timescales have been studied. Two asymptotic regimes of P0, which are characterized by different power laws, have been found. The structural functions of different orders and the types of diffusion processes in different regions, depending on time variations in the generalized diffusion coefficient, have been studied in order to analyze the character of diffusion processes. For the magnetosheath regions, it has been found that the diffusion coefficient increases in the course of time (i.e., the regime of superdiffusion has been obtained).

The work is done in the frame of complex program of NAS of Ukraine on space researches for 2012-1016, within the framework of the educational program No.2201250 \Education, Training of students, PhD students, scientific and pedagogical staff abroad" launched by the Ministry of Education and Science of Ukraine and under a partial support of the grant Az. 90 312 from the Volkswagen Foundation («VW-Stiftung»).