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Latitudinal amplitude-phase structure of MHD waves: STARE radar and image magnetometer observations and modeling

机译：MHD波的横向振幅相位结构：STARE雷达和图像磁力计的观测和建模

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We have developed a numerical model that yields a steady-state distribution of field components of MHD wave in an inhomogeneous plasma box simulating the realistic magnetosphere. The problem of adequate boundary condition at the ionosphere–magnetosphere interface for coupled MHD mode is considered. To justify the model’s assumptions, we have derived the explicit inequality showing when the ionospheric inductive Hall effect can be neglected upon the consideration of Alfven wave reflection from the ionospheric boundaries. The model predicts a feature of the ULF spatial amplitude/phase distribution that has not been noticed by the field line resonance theory: the existence of a region with opposite phase delays on the source side of the resonance. This theoretical prediction is supported by the amplitude-phase latitudinal structures of Pc5 waves observed by STARE radar and IMAGE magnetometers. A gradual decrease in azimuthal wave number m at smaller L-shells was observed at longitudinally separated radar beams.
机译：我们已经开发了一个数值模型，可以在模拟真实磁层的非均匀等离子体盒中产生MHD波场分量的稳态分布。考虑了耦合MHD模式在电离层-磁层界面上的适当边界条件的问题。为了证明模型的假设是正确的，我们推导出了显式不等式，该不等式表示何时考虑电离层边界的Alfven波反射可以忽略电离层的感应霍尔效应。该模型预测了场线共振理论尚未注意到的ULF空间幅度/相位分布特征：共振源侧存在具有相反相位延迟的区域。 STARE雷达和IMAGE磁力计观测到的Pc5波的振幅相位纬度结构为这一理论预测提供了支持。在纵向分开的雷达波束上，在较小的L壳处观察到方位波数m逐渐减小。

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