论文标题
太阳风湍流的电场波动频谱的各向异性
Anisotropy of Electric Field Fluctuations Spectrum of Solar Wind Turbulence
论文作者
论文摘要
为了研究太阳风湍流惯性范围内的功率和光谱指数各向异性，我们使用群集航天器在游离太阳风中累积的70个间隔的电场数据。我们使用小波分析技术来计算电场波动谱，并研究其光谱指数变化，随着地层中心径向方向与局部平均磁场之间的角度变化。我们发现频率为0.01 Hz至0.1 Hz的频率清晰的功率和光谱指数各向异性，并平行波动的功率多于垂直。我们还报告了对各向异性的研究，这是太阳活性的函数。
To investigate the power and spectral index anisotropy in the inertial range of solar wind turbulence, we use 70 intervals of electric field data accumulated by Cluster spacecraft in the free solar wind. We compute the electric field fluctuation power spectra using wavelet analysis technique and study its spectral index variation with the change in angle between the heliocentric radial direction and the local mean magnetic field. We find clear power and spectral index anisotropy in the frequency ranging from 0.01 Hz to 0.1 Hz, with more power in parallel fluctuations than perpendicular. We also report our study of anisotropy as a function of solar activity.
