27th Young Scientists' Conference on Astronomy and Space Physics

Plasma Wave Recognition by Multipoint Filtering Techniques

29 Apr 2021, 19:05

15m

https://us02web.zoom.us/j/2709113918?pwd=ZnIyUml2VEN6YnkvSi90eTlwUzNLUT09

Solar physics and heliosphere; Atmospheric studies and space geophysics

Speaker

Mr Bohdan Petrenko (Taras Shevchenko National University of Kyiv, Kyiv, Ukraine)

Description

Turbulent wave fluctuations of plasma parameters obtained from the spacecraft measurements have mixed manifestations of spatial and temporal scales due to the dynamics of the considered environment. Decomposing of such plasma perturbations into frequency and spatial range have allowed us to analyse power distribution in branches of dispersion equations. We have demonstrated efficiency of each specific method in resolving $\omega -k$ distribution in magnetospheric events. These techniques such as k-filtering, MSR (Multi-point Signal Resonator), phase difference methods yield the power spectrum $P=P(\omega ,k)$ in four-dimensional $(\omega ,k)$ space, and thereafter for a fixed value of the frequency ${\omega }_0$ it is possible to study the power distribution of fluctuation in spatial dimensions.
The work was conducted in the frame plasma physics program of the National Academy of Sciences of Ukraine, the grant Az. 97 742 from the Volkswagen Foundation (“VWStiftung”) and International Institution of Space Research (ISSI-BJ).