Initial studies of high latitude magnetic field data during different magnetospheric conditions
Initial studies of high latitude magnetic field data during different magnetospheric conditions
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DOI：
10.1186/bf03352020
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发表时间：
2007-01-01
影响因子：
3
通讯作者：
Wanliss, J. A.
中科院分区：
文献类型：
--
作者：
Cersosimo, D. O.;Wanliss, J. A.
我们研究了不同地磁活动的高纬度磁力计数据的统计性质。这是通过表征地磁场非线性统计的变化，通过赫斯特指数，从一个地面磁力计站测量实现的。局部观测点地磁场的长期统计性质可以描述为多分数布朗运动，从而提出磁层活动数学模型所需的统计结构。我们还发现，一般来说，安静磁层层的平均赫斯特指数小于活跃磁层层的平均赫斯特指数。
We investigate the statistical properties of high-latitude magnetometer data for differing geomagnetic activity. This is achieved by characterizing changes in the nonlinear statistics of the geomagnetic field, by means of the Hurst exponent, measured from a single ground-based magnetometer station. The long-range statistical nature of the geomagnetic field at a local observation site can be described as a multifractional Brownian motion, thus suggesting the statistical structure required of mathematical models of magnetospheric activity. We also find that, in general, the average Hurst exponent for quiet magnetospheric intervals is smaller than that for more active intervals.