Consolini Giuseppe, De Michelis Paola, Meloni Antonio
Istituto di Fisica dello Spazio Interplanetario, CNR, I-00133 Roma, Italy.
Phys Rev E Stat Nonlin Soft Matter Phys. 2002 Mar;65(3 Pt 2B):037303. doi: 10.1103/PhysRevE.65.037303. Epub 2002 Mar 7.
The aim of this work is to investigate the time spectral features of the main geomagnetic field fluctuations as measured on the Earth's surface in connection with a nontraditional turbulent dynamics of the fluid motions in the outer layers of the Earth's liquid core. The average geomagnetic field spectrum is found to be a power law, characterized by a spectral exponent alpha approximately -11/3, on time scales longer than 5 yr. We discuss the spectral exponent in connection with an intense magnetic field in the Earth's core and with a vortex coalescence process in a regime of drift-wave turbulence.
这项工作的目的是研究在地球表面测量的主地磁场波动的时间谱特征，这与地球液态外地核外层流体运动的非传统湍流动力学有关。发现在时间尺度大于5年时，平均地磁场谱是一个幂律，其特征谱指数α约为 -11/3。我们结合地核中的强磁场以及漂移波湍流 regime 中的涡旋合并过程来讨论谱指数。
