Measurement of the Stochasticity of Low-Latitude Geomagnetic Temporal Variations
Measurement of the Stochasticity of Low-Latitude Geomagnetic Temporal Variations
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DOI：
10.5194/angeo-21-2025-2003
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发表时间：
2003-09
影响因子：
1.9
通讯作者：
J. Wanliss;M. A. Reynolds
中科院分区：
文献类型：
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作者：
J. Wanliss;M. A. Reynolds
抽象的。使用功率谱和赫斯特范围缩放技术对低纬度 6 个站点的总磁场强度的地面磁力计测量结果进行了分析。大多数时间序列的赫斯特指数接近 0.5，这表明具有随机性，最高纬度站的赫斯特指数大于 0.6，表现出一定的持久性。虽然没有明显的明确相关性，但赫斯特指数随纬度的相对增加表明磁层的潜在动力学随纬度变化的可能性。这一结果可能有助于量化内部磁层本身的动力学，而无需直接存在太阳风驱动器。关键词。磁层物理（磁层配置和动力学；等离子体层） – 空间等离子体物理（非线性现象）
Abstract. Ground magnetometer measurements of total magnetic field strength from 6 stations at low latitudes were analyzed using power spectrum and Hurst range scaling techniques. The Hurst exponents for most of these time-series were near 0.5, which indicates stochasticity, with the highest latitude stations exhibiting some persistence with Hurst exponents greater than 0.6. Although no definite correlations are evident, the relative increase of the Hurst exponent with latitude suggests the possibility that the underlying dynamics of the magnetosphere change with latitude. This result may help quantify the dynamics of the inner magnetosphere itself without the direct presence of the solar wind driver. Key words. Magnetospheric physics (magnetospheric configuration and dynamics; plasmasphere) – Space plasma physics (nonlinear phenomena)