Ballooning perturbations in the inner magnetosphere of the Earth: Spectrum, stability and eigenmode analysis

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• 作者：A.V. Agapitov ; O.K. Cheremnykh ; A.S. Parnowski
• 关键词：Magnetosphere ; Magnetosphere– ; ionosphere coupling ; Ballooning modes ; Flute modes
• 刊名：Advances in Space Research
• 出版年：2008
• 期刊代码：6_02731177
• 类别：et
• 出版时间：2008
• 卷：41
• 期：10
• 页码：1682-1687
• 文件大小：492 K

摘要

We investigate the generation of ballooning perturbations in the inner magnetosphere of the Earth in the dipole model of the geomagnetic field taking into account ionospheric boundary conditions. The ionosphere is considered as a thin layer with finite conductivity. The eigenmode spectrum is discrete and consists of Alfvén, slow magnetosonic, flute and incompressible modes. Their interaction depends on ionospheric conductivity. The decay rate is small in noon and night sectors and large in dawn and dusk sectors. The lowest stability threshold /γ ≈ 4.25 is determined by flute modes.