Investigation of perturbations and collective motions of plasma in the inner magnetosphere of the Earth

Heading: 
Space and Atmospheric Physics
1Cheremnykh, OK, 1Parnowski, AS, 2Agapitov, AV
1Space Research Institute of the National Academy of Sciences of Ukraine and the State Space Agency of Ukraine, Kyiv, Ukraine
2Taras Shevchenko National University of Kyiv, Kyiv, Ukraine
Kosm. nauka tehnol. 2008, 14 ;(5):095-106
https://doi.org/10.15407/knit2008.05.095
Publication Language: Russian
Abstract: 
The paper deals with the investigation of generation, stability and spectrum of transversally small-scale ULF eigenmode perturbations of the magnetospheric resonator with consideration for pressure, its gradient, field line curvature and finite ionospheric conductivity. A set of equations for small transversally small-scale perturbations of static MHD equilibrium is derived. It describes coupled Alfven and slow magnetosonic modes in the dipolar model of the Earth's inner magnetosphere. These equations are supplemented by complex ionospheric boundary conditions with dissipation. The energetic principle showed that the stability of the system was determined by flute modes at finite ionospheric conductivity and by ideal ballooning modes at infinite one. For both these types of perturbations, stability criteria were derived. It is found that the eigenmode spectrum is discrete and its lines have finite width due to the presence of modes with different polarizations. We revealed that frequencies of Alfven modes decreased when the ionospheric conductivity decreased, and vanished fat certain value of the latter. These results were verified by numerical calculations and observational data processing.
Keywords: ionosphere, resonator, small-scale perturbations
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