Generation of resonant Alfvén waves in the auroral oval
Generation of resonant Alfvén waves in the auroral oval
复制标题
极光椭圆区中阿尔文共振波的产生
DOI：
10.5194/angeo-34-241-2016
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发表时间：
2016
影响因子：
1.9
通讯作者：
O. Kozyreva
中科院分区：
文献类型：
--
作者：
V. Pilipenko;D. Klimushkin;P. Mager;M. Engebretson;O. Kozyreva
抽象的。许多独立的观测表明，共振场线Pc5脉动（典型的周期约为几分钟）最好在极光椭圆内激发。考虑最明显的解释方案表明，没有简单的解释这种效果。在这里，我们认为理论上的产生的环形Pc5阿尔芬波波动磁层场向电流。结果表明，Alfven波的纬向结构具有与经典场线共振情况相同的特征：峰位于纬向，在共振磁层上有180°的相移.这个模型提出了一个额外的机制，超低频（ULF）波激发，可以在极光纬度。
Abstract. Many independent observations have shown that resonant field line Pc5 pulsations (typical periods of about several minutes) are preferably excited inside the auroral oval. Consideration of the most evident interpretation schemes shows that there is no simple explanation of this effect. Here we consider theoretically the generation of toroidal Pc5 Alfven waves by fluctuating magnetospheric field-aligned currents. It is shown that the Alfven wave latitudinal structure has the same features as in the case of the classical field line resonance driven by external sources: a peak localized in latitude and a 180° phase shift across the resonant magnetic shell. This model suggests an additional mechanism of ultra-low-frequency (ULF) wave excitation which can operate at auroral latitudes.