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Influence of magnetic shear on the collisional current driven ion cyclotron instability

P Satyanarayana, G Ganguli, S L Ossakow1984年Plasma Physics and Controlled FusionIF 2.2出版社

The effects of magnetic shear on the collisional current driven ion cyclotron instability are discussed by incorporating the self-consistent magnetic shear produced by the currents driving the instability itself. It is found that large currents J>or approximately=mA m-2 are needed to significantly modify the properties of the local instability. The wave packet localizes around kz/ky<<1, thereby indicating that the mode is propagating almost perpendicular to the magnetic field. Under auroral conditions (J approximately 10 mu A m-2, Ls approximately 500 km) it is found that the mode is confined to a region of a few hundred meters along the direction of the magnetic field and its local growth rate is unaffected by the magnetic shear.

日本語訳

磁気シアが、衝突性の電流駆動イオンサイクロトロン不安定性に及ぼす影響について、不安定性自体を駆動する電流によって生成される自己無撞着な磁気シアを考慮して議論する。局所的な不安定性の特性を有意に変化させるためには、J>約mA m⁻²の大きな電流が必要であることが見出される。波束はkz/ky<<1の周辺に局在し、これにより伝播モードが磁場に対してほぼ垂直であることが示される。極光条件(J≈10μA m⁻²、Ls≈500km)では、モードは磁場方向に沿って数百メートルの領域に閉じ込められ、その局所成長率は磁気シアの影響を受けないことが見出される。

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Current driveMagnetic shearCyclotron instability
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