Statistics of the Interplanetary Magnetic Fields Observed at 0.72 AU And 1 AU |
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| Authors: | Li Xiaoyu Zhang Tielong |
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| Affiliation: | 1.State Key Laboratory of Space Weather, Center for Space Science and Applied Research, Chinese Academy of Sciences, Beijing, 100190, China2.Graduate University of Chinese Academy of Sciences, China3.Space Research Institute, Austria Academy of Sciences, Graz, Austria |
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| Abstract: | This paper presents the Interplanetary Magnetic Field (IMF) observations at 0.72 AU measured by Venus Express (VEX) and 1 AU by Advanced Composition Explorer (ACE) in 2007. The distributions of daily averages of B are lognormal in both locations. The multiscale structure of the magnetic field fluctuations was described by studying the increments of B over a range scales from 10 min to 21.3 hours. All the Probability Distribution Functions (PDFs) can be described quantitatively by Tsallis distribution function. On the ecliptic plane from 0.72 AU to 1 AU, the entropy index q increases with distance over all scales, indicating the intermittency of turbulence is growing. The widths of the PDFs at 0.72 AU are larger than those at 1 AU at all scales, which indicating the turbulence at 0.72 AU is more intense than that at 1 AU. This helps us understand the nature and development of the magnetic field fluctuations. |
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| Keywords: | IMF Tsallis distribution Solar wind fluctuations |
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