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- Title
Ballooning Instability in the Magnetospheric Plasma: Two‐Dimensional Eigenmode Analysis.
- Authors
Rubtsov, Aleksandr V.; Mager, Pavel N.; Klimushkin, Dmitri Yu.
- Abstract
This paper is concerned with the transverse structure of the ballooning instability in a two‐dimensionally inhomogeneous model of the magnetosphere, which takes into account inhomogeneity both across the magnetic shells and along the field lines. According to the previous studies, the ballooning instability can develop at steep fall of the plasma pressure from the Earth. In this paper, the region of negative plasma pressure gradient is assumed to be sharply localized across the magnetic shells. It causes the localization of the unstable perturbation in the same direction. In this region, the perturbation has a resonator‐like structure, where only modes with discrete set of the growth rate values can exist. The azimuthal wave number of the unstable mode must exceed some critical value, which is determined by the width of the localization region. Key Points: The unstable ballooning perturbation is localized in the same region where the sharp plasma pressure decrease from the Earth takes placeThe perturbation has a resonator‐like structure with discrete values of the growth rate corresponding to different radial harmonicsThere is an upper threshold of an azimuthal scale of the unstable ballooning mode that is determined by the sharp plasma pressure fall width
- Subjects
BALLOONING; MAGNETOSPHERE; PLASMA pressure; MAGNETIC fields; PERTURBATION theory
- Publication
Journal of Geophysical Research. Space Physics, 2020, Vol 125, Issue 1, pN.PAG
- ISSN
2169-9380
- Publication type
Article
- DOI
10.1029/2019JA027024