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Registration Number

0221U101232, 0119U101631 , R & D reports

Title

The role of turbulent and wave processes in space plasma

Head

Cheremnykh Oleg K., Доктор фізико-математичних наук

Registration Date

18-01-2021

Organization

Department for special training National academy of science of Ukraine at Kiev University

Description

Methods of phase difference, k-filtering, MSR technique are analyzed in detail, which allow to obtain a set of wave power peaks with different spatial scales at the same frequency using multi-satellite measurements. The software implementation of these methods with their successful testing on artificial data is executed. The efficiency of each method to detect magnetic field spectra maxima depending on the ability to provide scalar or vector time series is demonstrated. The wave activity before the start of the magnetospheric substorm was analyzed, and it was found that 10-second waves with linear polarization are dominant. Cross-correlation allowed to determine the lower limit of the propagation velocity of such perturbations in the Earth's magnetotail. Using measurements from the Cluster-II space mission, the characteristics of different plasma parameters are compared in the current disruption regions. The results obtained indicate to the presence of spectral breaks, powerful Pc4 and Pi1 pulsations, and cascades. The dispersion ratios also suggest nonlinear energy cascade processes in the current disruption regions. The interaction of solar chromospheric jets with separated vortices was researched. It has been shown that vortex can create a thrust applied to the jet and directed upwards during interaction with a jet. The generation of low-frequency plasma waves in the pre-flare plasma in the active region of the Sun is considered. A semi-empirical model of the solar atmosphere VAL (F) is used. It is shown that it is possible to predict the beginning of the flare process in the active region using the interaction of kinetic Alvenan and kinetic ion-sound waves. The VAL (F) model allows situations when the main source of the aforementioned instability can be a sub-Dreicer electric field and drift plasma movements due to presence of spatial inhomogeneities. It is shown that the generation of kinetic Alfven and kinetic ion-acoustic waves can occur both, in plasma wit 

Product Description

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Ivchenko Vasyl M
Voitsekhovska Anna D
Kozak Liudmyla V
Cheremnykh Oleg K
Cheremnykh Sergey O