Tsallis Statistics of the Magnetic Field in the Heliosheath
Tsallis Statistics of the Magnetic Field in the Heliosheath
复制标题
日鞘磁场的 Tsallis 统计
DOI：
10.1086/505577
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发表时间：
2006
期刊：
影响因子：
--
通讯作者：
M. Acuna
中科院分区：
文献类型：
--
作者：
L. Burlaga;A. Viñas;N. Ness;M. Acuna
旅行者1号于2004年12月16日在距离太阳94 Au处穿越了终止激波，从那时起它一直在穿过日鞘向星际介质移动。在日鞘中观测到的磁场强度B的分布在很宽的尺度范围内都是高斯分布，但测量的剖面似乎是连续的，磁场强度B（t）偶尔会有大的跳跃。在1 ~ 128天尺度τ上，B变化的所有概率分布dBn B（t + τ）- B（t）都能用非广延统计力学的对称Tsallis分布拟合。在≥32天的尺度上，分布是高斯分布，但在1到16天的尺度上，概率分布函数有非高斯的尾部，这表明内日鞘在1到16天的尺度上不是统计平衡的。
The spacecraft Voyager 1 crossed the termination shock on 2004 December 16 at a distance of 94 AU from the Sun, and it has been moving through the heliosheath toward the interstellar medium since then. The distributions of magnetic field strength B observed in the heliosheath are Gaussian over a wide range of scales, yet the measured profile appears to be filamentary with occasional large jumps in the magnetic field strength B(t). All of the probability distributions of changes in B, dBn ≡ B(t + τ) - B(t) on scales τ from 1 to 128 days, can be fit with the symmetric Tsallis distribution of nonextensive statistical mechanics. At scales ≥32 days, the distributions are Gaussian, but on scales from 1 through 16 days the probability distribution functions have non-Gaussian tails, suggesting that the inner heliosheath is not in statistical equilibrium on scales from 1 to 16 days.