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首页> 外文期刊>Izvestiya. Physics of the solid earth >High Latitude Magnetic Impulse Events (MIEs): Polarization Peculiarities and Excitation Conditions
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High Latitude Magnetic Impulse Events (MIEs): Polarization Peculiarities and Excitation Conditions

机译：高纬度磁脉冲事件（MIES）：偏振特性和励磁条件

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摘要

Polarization characteristics (polarization type, ellipticity epsilon, tilt angle of the polarization ellipse's major axis) of high-latitude magnetic impulse events (MIEs) observed at the latitude of the dayside polar cusp are studied. It is established that all impulses are elliptically polarized, being right-polarized in 43% of cases (R-type) and left-polarized in 57% of cases (L-type). The right-polarized MIEs on the ground are more pronounced in the azimuthal direction, whereas the left-polarized events are more clearly marked in the meridional direction. The MIEs of both polarization types have the properties of intermittent processes. It is shown that diurnal and seasonal variations in the occurrence frequency and amplitudes of the events depend significantly on the type of their polarization. The R- and L-type impulse events are predominantly observed during the descending and ascending phase of the solar cycle, respectively. Solar wind high-speed streams (HSSs) are more favorable for exciting right-polarized impulses, whereas left-polarized impulse events are more efficiently excited by coronal mass ejection (CME). It is established that R-type impulses emerge in the conditions when the orientation of the interplanetary magnetic field vector is close to the radial direction against the development of moderate magnetospheric substorms whereas the L-type impulses appear when IMF is perpendicular to the Sun-Earth line in the absence of substorms. The behavior of the characteristics of impulse events significantly depends on the value of the IMF Bz-component and on the angle (xB) = arccos(Bx/B). It is conjectured that excitation of the two groups of impulses is caused by the IMF structures in the solar wind stream with the characteristic configuration in the ecliptic plane, which determine the polarization type and properties of MIEs.
机译：研究了在天花柱纬度观察到的高纬度磁脉冲事件（MIES）的偏振特性（偏振型，椭圆形ε，偏振椭圆形的主轴的倾斜角度）。确定所有脉冲均为椭圆偏振，43％的病例（R型）和57％的病例（L型）中的左右偏振。地面上的右偏振的MIE在方位角方向上更加明显，而左极化事件在优选方向上更清晰。两种极化类型的MIE具有间歇过程的性质。结果表明，事件发生频率和幅度的昼夜季节变化显着取决于它们极化的类型。在太阳循环的下降和上升阶段，r-和l型脉冲事件主要观察到太阳循环的下降阶段。太阳能高速流（HSSS）对于激发令人兴奋的右极脉冲更有利，而左偏振的脉冲事件通过冠状体积喷射（CME）更有效地激发。建立R型脉冲在行星型磁场矢量的方向接近径向方向上的径向上，而L型脉冲在IMF垂直于太阳地球时出现没有代甲的线。脉冲事件特征的特征的行为显着取决于IMF BZ组分的值和角度（XB）= ARCCOS（Bx / B）。猜测这两组脉冲的激发是由太阳风流中的IMF结构引起的，其具有辉光平面中的特征构造，其确定了MIES的偏振类型和性质。

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