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Influence of ionospheric conductivity on mid-latitude Pc 3-4 pulsations

机译：电离层电导率对中纬度Pc 3-4脉动的影响

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Diurnal variations of the parameters of the magnetospheric Alfven resonator at different latitudes have been calculated using a semi-empirical model of the ionosphere-magnetosphere plasma distribution. The ionospheric plasma density is taken from the IRI model, the electron density at the magnetospheric equator is based on the ISEE/whistler model, and the field-aligned magnetospheric plasma distribution is calculated under the assumption of diffusive equilibrium. It is shown that for the mid-latitude ionosphere the Hall conductivity has no effect on the parameters of the magnetospheric Alfven resonator. The calculated values of damping rates of Alfven oscillations at middle latitudes during the dark period are too high for the "free-end" and "Quarter-wave" oscillation regimes to be realized. At low latitudes quality factors are relatively high both at daytime and nighttime conditions. An expected change of a field-aligned structure of Alfven oscillations during the transition from dayside to nightside ionospheric conditions does not occur. The analysis of the experimental data recorded at middle and low latitude stations of the "210 deg Magnetic Meridian" magnetometer network and station l' Aquila gives the results, compatible with the predictions of the numerical model: (a) the pulsation amplitude in a frequency band near the fundamental harmonic of the Alfven field line resonance has the strongest dependence on the ionospheric conductivity; (b) the influence of dayight ionospheric conditions on the Pc 3 amplitudes is less at low (L <= 2) geomagnetic latitudes than at middle latitudes; (c) the ionospheric conductivity control of the Pc 3 amplitude at middle latitudes weakens with increasing harmonic number.
机译：使用电离层-磁层等离子体分布的半经验模型，计算了不同纬度上的磁层Alfven谐振器参数的日变化。电离层等离子体密度取自IRI模型，磁层赤道的电子密度基于ISEE / whistler模型，在扩散平衡的假设下计算了磁场取向的磁层等离子体分布。结果表明，对于中纬度电离层，霍尔电导率对磁层Alfven谐振器的参数没有影响。在暗期中纬度的Alfven振荡的阻尼率的计算值对于实现“自由端”和“四分之一波”振荡体制而言太高了。在低纬度地区，无论白天还是晚上，品质因数都相对较高。从白天到夜晚电离层条件转换期间，Alfven振荡的场取向结构不会发生预期的变化。对“ 210度磁子午线”磁力计网络的中低纬度站点和l'Aquila站点记录的实验数据的分析得出的结果与数值模型的预测相符：（a）频率中的脉动幅度Alfven场线共振的基波附近的频带对电离层电导率的依赖性最大。 （b）在低（L <= 2）地磁纬度下，昼/夜电离层条件对Pc 3振幅的影响小于在中纬度; （c）中纬度Pc 3振幅的电离层电导率控制随着谐波次数的增加而减弱。

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