Properties of AE data and bicolored noise
Properties of AE data and bicolored noise
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AE 数据和双色噪声的特性
DOI：
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发表时间：
1994
期刊：
影响因子：
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通讯作者：
H. Koskinen
中科院分区：
文献类型：
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作者：
J. Takalo;J. Timonen;H. Koskinen
对13期20天的声发射数据进行了详细分析。平均相关维数为3.4，计算维数与磁层活动有关，活动期越长，相关维数越小。然而，这种明显的相关维度并不意味着声发射数据背后的磁层系统是低维的。相反，双色噪声与声发射数据具有许多相同的特性。同时发现声发射时间序列具有自仿射特性，标度指数在约2小时的时间尺度上发生变化。在声发射数据的功率谱中，这个时间尺度在大约1/（5小时）处表现为谱断裂。
A detailed analysis has been made of 13 periods of 20 days of the AE data. The average correlation dimension is found to be 3.4, and the calculated dimension is found to depend on the magnetospheric activity such that more active periods have smaller dimensions. This apparent correlation dimension does not, however, imply that the magnetospheric system behind the AE data is low-dimensional. On the contrary, bicolored noise is shown to share many properties with the AE data. The AE time series is also found to be self-affine such that the scaling exponent changes at the time scale of about 2 hours. This same time scale is suggested to appear as a spectral break at about 1/(5 hours) in the power spectrum of the AE data.