局部气泡中的血浆Turbulence
Plasma Turbulence in the Local Bubble
摘要：
局部气泡中的湍流可能在那里的气体热力学中扮演重要角色。测量天体物理等离子体中湍流的最佳天文技术是无线电闪烁。Philips和Clegg在1992年对附近脉冲星B 0950 +08的散射水平进行的测量表明，视线平均湍流强度参数$<C_N^2>$的值明显低于对其他脉冲星观测到的值，这与无线电波通过高度稀薄等离子体的传播相一致。在本文中，我们讨论了自那时以来所取得的观测进展。目前，有四个观察者（B 0950 +08，B1133+16，J 0437 -4715和B 0809 +74）的视线似乎主要位于本地泡沫内。星际磁场沿这些视线的平均密度和视线分量都小于恒星的标称值，但没有预期的那么多。四颗星中的三颗也有星际闪烁的测量。参数$<C_N^2>$的值对于其中两个小于正常值，但是对于第三个完全是标称值。这种不确定的状况可以通过测量和分析恒星“次级光谱”中的“弧”来改善。
英文摘要：
Turbulence in the Local Bubble could play an important role in the thermodynamics of the gas that is there. The best astronomical technique for measuring turbulence in astrophysical plasmas is radio scintillation. Measurements of the level of scattering to the nearby pulsar B0950+08 by Philips and Clegg in 1992 showed a markedly lower value for the line-of-sight averaged turbulent intensity parameter $<C_N^2>$ than is observed for other pulsars, consistent with radio wave propagation through a highly rarefied plasma. In this paper, we discuss the observational progress that has been made since that time. At present, there are four pulsars (B0950+08, B1133+16, J0437-4715, and B0809+74) whose lines of sight seem to lie mainly within the local bubble. The mean densities and line of sight components of the interstellar magnetic field along these lines of sight are smaller than nominal values for pulsars, but not by as much expected. Three of the four pulsars also have measurements of interstellar scintillation. The value of the parameter $<C_N^2>$ is smaller than normal for two of them, but is completely nominal for the third. This inconclusive status of affairs could be improved by measurements and analysis of ``arcs'' in ``secondary spectra'' of pulsars.
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