STATISTICAL ANALYSIS OF THE MAGNETIC FIELD MEASUREMENTS

Автор(и)

  • L. Kozak Kyiv National Taras Shevchenko University, Україна
  • A. Lui Johns Hopkins University Applied Physics Laboratory, Laurel, Maryland, США
  • S. Savin Space Research Institute, Russian Academy of Sciences, Moscow, Російська Федерація

DOI:

https://doi.org/10.18524/1810-4215.2013.26.83835

Ключові слова:

turbulent model, intermittency, statistical properties of boundary layers, Earth’s magnetosphere

Анотація

Investigation of statistical features of the magnetic field fluctuations in bound regions of Earth's magnetosphere, on different time scales, is carried out in this work. Measurements of Cluster-II with frequency 22.5 Hz for 2004-2008 years have been used for the analysis. During these investigations we have studied the changes of shape and parameters of probability density function for magnetic field fluctuations for periods of presence of the satellite in magnetosheath, solar plasma wind and in region of magnetopause. We have considered the evolution of change of maximum of probability den­sity function and investigated structure functions of differ­ent orders as characteristics of turbulent processes for dif­ferent time scales. Investigation of structure functions of high orders helped us to determine the character of turbu­lent processes and study diffusion in the considered re­gions. We have found, that the highest intermittence is observed in the postshock region; for the middle magnetosheath the results of experimental data correspond to log-Poisson turbulent cascade model, and for the descrip­tion of processes in SW plasma one can use the Iroshnikov-Kraichnan's model.

 

Посилання

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Опубліковано

2013-11-19

Номер

Том 26 № 2 (2013)

Розділ

Статті

Ліцензія

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Відповідно Закону України про авторське право і суміжні права N 3792-XII від 23 грудня 1993 року