Analysis of spectrum of "warm" plasma's MHD eigenperturbations in the inner Earth's magnetosphere

1Parnowski, AS, 1Cheremnykh, ОК
1Space Research Institute of the National Academy of Sciences of Ukraine and the State Space Agency of Ukraine, Kyiv, Ukraine
Kosm. nauka tehnol. 2003, 9 ;(5-6):111-116
Publication Language: Russian
A spectrum of MHD eigenperturbations of magnetospheric plasma is analysed. Toroidal Alfven and ionosonic modes are shown to be main eigenmodes for a system with "rigid" boundary conditions on the ionosphere in the case of low pressure. As the pressure increases, poloidal Alfven modes are generated in the magnetospheric plasma. Certain relations between the value of the pressure and its profile make them unstable. In this case one can refer to them as to unstable ballooning modes. The boundary conditions strongly affect the spectrum of the eigenperturbations in the magnetospheric plasma.
Keywords: inner Earth's magnetosphere, MHD eigenperturbations, «warm» plasma
1. Cheremnykh O. K., Burdo O. S., Kremenetsky I. A., Parnowski A. S. To the theory of the MHD waves in the inner magnetosphere of the Earth. Kosm. nauka tehnol., 7 (5-6), 44—63 (2001) [in Russian].
2. Cheng C. Z., Chang T. C., Lin C. A., Tsai W. H. Mag-netohydrodynamic theory of field line resonances in the magnetosphere. J. Geophys. Res., 98A (7), 11339—11347 (1993).
3. Hameiri E., Laurence P., Mond M. The ballooning instability in space plasmas. J. Geophys. Res., 96, 1513— 1518 (1991).
4. Yoshikawa A., Itonaga M., Fujita S., et al. Eigenmode analysis of field line oscillations with the ionosphere — atmosphere — solid Earth electromagnetic coupled system. J. Geophys. Res., 104A (12), 28437—28457 (1999).