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Magnetosonic resonances in the magnetospheric plasma

机译：磁层等离子体中的磁声共振

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A problem of coupling between fast and slow magnetosonic waves in Earth's magnetosphere (magnetosonic resonance) is examined. Propagation both slow magnetosonic wave and Alfven wave can easily be canalized along the magnetic field line direction. The main difference between the two is that slow magnetosonic waves dissipate strongly due to their interaction with the background plasma ions, whose temperature is above the electron temperature. In Earth's magnetosphere, however, there is a region where the dissipation of slow magnetosonic waves can be weak—the inner plasmasphere. The slow magnetosonic waves generated there can be registered directly. In other regions, with strong dissipation of slow magnetosonic waves, their signature may be detected through their impact on the Alfven resonance at frequencies for which the resonant Alfven and slow magnetosonic waves exist simultaneously in the magnetosphere. Owing to their strong coupling with the background plasma ions, resonant slow magnetosonic waves can transfer the energy and impulse from the solar wind to the magnetospheric plasma ions via fast magnetosonic waves penetrating into the tail lobes. A problem of resonant conversion of fast magnetosonic waves into slow magnetosonic oscillations in a magnetosphere with dipole-like magnetic field is also examined.
机译：研究了地球磁层中快磁波和慢磁波之间的耦合问题（磁声共振）。慢磁声波和阿尔夫文波的传播都可以很容易地沿磁场线方向传播。两者之间的主要区别在于，慢速磁声波由于其与背景等离子的相互作用而强烈消散，背景等离子的温度高于电子温度。但是，在地球的磁层中，慢电磁波的耗散可能很弱，即内部等离子层。在那里产生的慢磁声波可以直接记录。在其他区域，由于慢磁声波的强烈消散，可以通过它们对Alfven谐振的影响来检测它们的特征，在该频率下，磁谐振层中同时存在Alfven和慢磁声波。由于它们与本底等离子体离子的强耦合，共振的慢磁声波可以通过穿透尾翼的快速磁声波将能量和脉冲从太阳风传递到磁层等离子体离子。还研究了在具有偶极子状磁场的磁层中将快磁声波共振转换为慢磁声振荡的问题。

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