Turbulence Driving by Interstellar Pickup Ions in the Outer Solar Wind
Turbulence Driving by Interstellar Pickup Ions in the Outer Solar Wind
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DOI：
10.3847/1538-4357/acb337
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发表时间：
2023-01
期刊：
影响因子：
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通讯作者：
P. Isenberg;B. Vasquez;Charles W. Smith
中科院分区：
文献类型：
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作者：
P. Isenberg;B. Vasquez;Charles W. Smith
我们重新审视的问题，如何不稳定的散射的星际拾取离子（PUI）可能会驱动湍流的外太阳风，以及为什么能量释放到波动，这种散射似乎是显着低于标准的双球面预测。我们认为，在散射过程中，由周围的湍流的新拾取的离子的散射可以导致在一个更球形的分布的PUI和减少所产生的波动能量的水平与湍流强度和核心太阳风加热的观察一致。这种情况意味着一种自我调节机制的运作，这种机制维持了PUI主导的太阳风中观测到的湍流和加热条件。
We revisit the question of how the unstable scattering of interstellar pickup ions (PUIs) may drive turbulence in the outer solar wind and why the energy released into fluctuations by this scattering appears to be significantly less than the standard bispherical prediction. We suggest that energization of the newly picked-up ions by the ambient turbulence during the scattering process can result in a more spherical distribution of PUIs and reduce the generated fluctuation energy to a level consistent with the observations of turbulent intensities and core solar wind heating. This scenario implies the operation of a self-regulation mechanism that maintains the observed conditions of turbulence and heating in the PUI-dominated solar wind.