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Multi-Scale Analysis of the Geomagnetic Symmetric Index (sym)

机译:地磁对称指数(sym)的多尺度分析

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摘要

In this work we present a methodology to estimate the geomagnetic symmetric index (Sym) based on the wavelet analysis of the time series of the H component of the geomagnetic field measured at mid-latitude stations localized at Kakioka (KAK), Honolulu (HON), Hermanus (HER) and San Juan (SJG). A case study of the intense geomagnetic storm of 17–22 February 1999, caused by intense southward magnetic fields just behind an interplanetary shock driven by a magnetic cloud, is shown as an example of the procedure of derivation of the symmetric index and the capabilities of this analysis to improve the study of the coupling of the solar wind and the Earth's magnetosphere. Other examples are shown in order to demonstrate the applicability of the methodology to different magnetospheric conditions. It is shown that the long period variations of the symmetric index are linearly correlated to variations at the same periods of the H component of the geomagnetic field and that the contribution of short period variations to the symmetric index are biased by localized current systems such as the partial ring current and the field aligned currents.
机译:在这项工作中,我们提出了一种基于小波分析来估计地磁对称指数(Sym)的方法,该小波分析是对位于檀香山(HON)的Kakioka(KAK)中纬度站测得的地磁场H分量的时间序列进行的,赫曼努斯(HER)和圣胡安(SJG)。以1999年2月17日至22日的强烈地磁风暴为例,该磁场是由磁云驱动的行星际激波后面的强烈南向磁场引起的,它作为对称指数的推导过程和计算能力的一个例子。这项分析可以改善对太阳风与地球磁层耦合的研究。为了说明该方法在不同磁层条件下的适用性,给出了其他例子。结果表明,对称指数的长周期变化与地磁场H分量相同周期的变化线性相关,短周期变化对对称指数的贡献受局部电流系统(例如:局部振铃电流和磁场对准电流。

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  • 来源
    《Solar Physics》 |2003年第2期|383-394|共12页
  • 作者单位

    Instituto Nacional de Pesquisas Espaciais (INPE);

    Instituto Nacional de Pesquisas Espaciais (INPE);

    Instituto Nacional de Pesquisas Espaciais (INPE);

    Instituto Nacional de Pesquisas Espaciais (INPE);

    Instituto Nacional de Pesquisas Espaciais (INPE);

    Instituto Nacional de Pesquisas Espaciais (INPE);

    Instituto Nacional de Pesquisas Espaciais (INPE);

    Centro Regional Sul de Pesquisas Espaciais CRSPE/INPE;

    Centro Regional Sul de Pesquisas Espaciais CRSPE/INPE;

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