IBEX带的空间约束：一种主导的Turbulence机制
Spatial Confinement of the IBEX Ribbon: A Dominant Turbulence Mechanism
摘要：
由星际边界探测器（IBEX）航天器观测到的增强的高能中性原子流的窄带状物引发了许多解释其结构和性质的想法。其中一个想法是“中性太阳风“方案，该方案将源粒子确定为源自太阳风电荷交换相互作用的本地星际介质中的拾取质子。这种情况一直被认为需要不切实际的弱俯仰角散射的拾取质子来解释狭窄的结构。最近，Schwadron & McComas（2013）提出，这种结构可能是由于拾取质子的空间保留，而不是由于受限的俯仰角分布。在这里，我们提出了一个物理动机，定量机制，以产生这样的空间配置。这种机制是基于“主导湍流”的假设，它可以适用于新的拾取质子的生产是缓慢的，并已被用来成功地解释在外部太阳风中观察到的湍流加热水平。该形式主义预测了拾取各向同性化过程，该过程根据拾取质子的初始俯仰角从环境湍流波动中添加或减去能量。我们表明，这个过程的一个简单的模型可以产生一个带状结构的定性协议的意见。这个简单的模型的结果还没有定量令人满意，但我们提出了几个改进，可能会减少定量的差异。
英文摘要：
The narrow ribbon of enhanced energetic neutral atom flux observed by the Interstellar Boundary Explorer (IBEX) spacecraft has prompted numerous ideas to explain its structure and properties. One of these ideas is the "neutral solar wind" scenario, which identifies the source particles as pickup protons in the local interstellar medium originating in solar wind charge-exchange interactions. This scenario has been thought to require unrealistically weak pitch-angle scattering of the pickup protons to explain the narrow structure. Recently, Schwadron & McComas (2013) suggested that this structure could result from a spatial retention of the pickup protons, rather than from a restricted pitch-angle distribution. Here, we present a physically motivated, quantitative mechanism to produce such a spatial configuration. This mechanism is based on the "dominant turbulence" assumption, which can be applied where the production of new pickup protons is slow, and has been used to successfully explain the level of turbulent heating observed in the outer solar wind. This formalism predicts a pickup isotropization process which adds or subtracts energy from the ambient turbulent fluctuations, depending on the initial pitch angle of the pickup protons. We show that a simple model of this process can yield a ribbon structure in qualitative agreement with the observations. The results of this simple model are not yet quantitatively satisfactory, but we suggest several improvements which may reduce the quantitative discrepancy.
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