Dependence of the Dissipation Range Spectrum of Interplanetary Magnetic Fluctuationson the Rate of Energy Cascade
Dependence of the Dissipation Range Spectrum of Interplanetary Magnetic Fluctuationson the Rate of Energy Cascade
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DOI：
10.1086/506151
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发表时间：
2006-06
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影响因子：
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通讯作者：
Charles W. Smith;Kathleen E. Hamilton;B. Vasquez;R. Leamon
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文献类型：
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作者：
Charles W. Smith;Kathleen E. Hamilton;B. Vasquez;R. Leamon
我们研究了太阳风中湍流磁耗散的性质。我们采用了一个数据库，描述了超过800个间隔的行星际磁场和太阳风测量记录的ACE航天器在1 Au的光谱。我们专注于在航天器频率≥0.3 Hz时形成的耗散范围的频谱特性，并表明，虽然在较低频率下的惯性范围显示出严格限制的频谱指数范围，耗散范围表现出广泛的幂律指数。我们表明，这种变化的解释在于通过惯性范围的能量级联率的耗散范围谱的依赖性，使陡峭的频谱形式导致从更大的级联率。
We investigate the nature of turbulent magnetic dissipation in the solar wind. We employ a database describing the spectra of over 800 intervals of interplanetary magnetic field and solar wind measurements recorded by the ACE spacecraft at 1 AU. We focus on the spectral properties of the dissipation range that forms at spacecraft frequencies ≥0.3 Hz and show that while the inertial range at lower frequencies displays a tightly constrained range of spectral indexes, the dissipation range exhibits a broad range of power-law indexes. We show that the explanation for this variation lies with the dependence of the dissipation range spectrum on the rate of energy cascade through the inertial range such that steeper spectral forms result from greater cascade rates.