Effect of current sheets on the power spectrum of the solar wind magnetic field using a cell model |
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| Authors: | G Li G Qin Q Hu B Miao |
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| Institution: | 1. Department of Physics and Center for Space Plasma and Aeronomic Research, University of Alabama in Huntsville, Huntsville, AL 35899, United States;2. State Key Laboratory of Space Weather, Center for Space Science and Applied Research, Chinese Academy of Sciences, Beijing 100190, China;3. Center for Space Plasma and Aeronomic Research, University of Alabama in Huntsville, Huntsville, AL 35899, United States;4. CAS Key Laboratory of Geospace Environment, University of Science and Technology of China, Hefei, Anhui 230026, China |
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| Abstract: | A puzzling observation of solar wind MHD turbulence is the often seen Kolmogorov scaling of k-5/3, even though the solar wind MHD turbulence is dominated by Alfvénic fluctuations. Recently Li et al. (2011) proposed that the presence of current sheets may be the cause of the Kolmogorov scaling. Here, using a cell model of the solar wind we examine the effect of current sheets on the power spectrum of the solar wind magnetic field. We model the solar wind as multiple cells separated by current sheets. We prescribe the spectra of turbulent magnetic field in individual cells as IK-like and examine the spectra along trajectories that cross multiple boundaries. We find that these spectra become softer and are consistent with the Kolmogorov-scaling. Our finding supports our recent proposal of Li et al. (2011). |
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| Keywords: | Solar wind MHD turbulence |
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