The dependence of the frequency spectra of the interplanetary magnetic-field fluctuations on the direction of the mean field期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

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The dependence of the frequency spectra of the interplanetary magnetic-field fluctuations on the direction of the mean field

Authors:	Jörn E Kunstmann

Institution:	(1) Institut für Reine und Angewandte Kernphysik, Universität of Kiel, W-Germany

Abstract:	The frequency spectra of the interplanetary magnetic field fluctuations are the projection of their wavenumber spectra onto one dimension. Only the frequency spectra can be measured by spacecrafts. It is studied how their measured size depends on the direction of the mean fieldB ₀, which structures the symmetry of the fluctuations relative to the solar wind system. It is specialized for the slab model, Alfvén waves, magneto-acoustic waves and the isotropic case. For the slab model the frequency spectra are proportional to $\left\| {\cos \psi } \right\|^{ - q - 1}$ , whereq is the spectral index and the angle betweenB ₀ and the radial direction. For the diffusion coefficientK _TT the relation $K_{rr} \sim \left\| {\cos \psi } \right\|^{ - q + 1}$ holds.

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