Abstract

The results of a statistical study of the polarization characteristics of irregular geomagnetic Pi3 pulsations observed in polar regions of the magnetosphere and the effect of interplanetary conditions on them are presented. One-minute digital observations of the magnetic field of the Heiss Island (HIS, Φ' = 74.80°, Λ' = 144.46°) and Mirny (MIR, Φ' = –76.93°, Λ' = 122.92°) observatories are used. Pi3 pulsations are characterized by right-handed, left-handed, and mixed polarizations (R, L, and R&L types, respectively). Regardless of the polarization type, Pi3 pulsations have been observed mainly in the night sector of the magnetosphere at the final stage of the explosive phase of the substorm. The duration of the time delay between the substorm onset and the occurrence of Pi3 pulsations depends significantly on their polarization type. HIS and MIR show no dependence of the main characteristics (amplitude, frequency, ellipticity, and tilt of the main axis of the polarization ellipse) of Pi3 pulsations of R, L, and R&L types on local time. In HIS, R- and R&L-type Pi3 pulsations are observed mainly during slow solar-wind streams, and L-type pulsations are observed during high-speed streams from coronal holes. In MIR, Pi3 pulsations of the three polarization types are observed mainly during high-speed solar-wind streams. Small-scale closed structures of the magnetic field in the flow of slow and fast solar-wind currents determine the polarization type of Pi3 pulsations. It is revealed that the excitation of Pi3 pulsations of the R, L, and R&L types occurs at different levels of plasma turbulence in the magnetotail.

中文翻译：

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高纬Pi3地磁脉动的极化特征

摘要

给出了对在磁层极性区域中观测到的不规则地磁Pi3脉动的极化特性以及行星际条件对其的影响的统计研究结果。使用Heiss岛（HIS，Φ'= 74.80°，Λ'= 144.46°）和Mirny（MIR，Φ'= –76.93°，Λ'= 122.92°）天文台的一分钟数字观测。Pi3脉动的特征是右旋，左旋和混合极化（分别为R，L和R＆L类型）。不论偏光类型，Pi3在亚暴的爆炸阶段的最后阶段，主要在磁层的夜区观察到了脉动。在亚暴爆发和Pi3脉动发生之间的时间延迟的持续时间在很大程度上取决于其极化类型。HIS和MIR显示R，L和R＆L类型的Pi3脉动的主要特征（振幅，频率，椭圆度和极化椭圆的主轴倾斜）不依赖于本地时间。在HIS中，R-和R＆L型Pi3脉动主要在太阳风缓慢流中观察到，L型脉动在日冕孔高速流中观察到。在MIR中，主要在高速太阳风流中观察到三种极化类型的Pi3脉动。缓慢和快速的太阳风电流中的磁场的小规模封闭结构决定了Pi3脉冲的极化类型。揭示了R，L和R＆L类型的Pi3脉冲的激发发生在磁尾中的等离子体湍流的不同水平上。