Ion-driven Instabilities in the Inner Heliosphere. I. Statistical Trends

Ion-driven Instabilities in the Inner Heliosphere. I. Statistical Trends
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内日光层中离子驱动的不稳定性。

DOI:
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发表时间:
2021
影响因子:
4.9
通讯作者:
B. Alterman
B. Alterman
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
M. Martinović;K. Klein;T. Ďurovcová;B. Alterman

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线性理论描述的不稳定性是太阳风中波粒相互作用的一种重要形式。我们诊断太阳风等离子体的不稳定行为之间的0.3和1 Au通过Nyquist标准,应用它来拟合的1.5 M质子和α粒子速度分布函数(VDFs)的太阳神I和II观测。不稳定间隔的比例随太阳径向距离的变化是线性的,表明不稳定模式的活动逐渐下降。当计算的太阳风速度和库仑数的函数,我们得到更极端的,指数趋势的碰撞似乎有一个显着的影响VDF的区域。不稳定增长率表现出类似的行为,并显着降低库仑数。我们发现,对于不可忽略的一部分观测,质子束或二次分量可能不会被检测到,由于仪器分辨率的限制,并证明这个问题的影响并不影响这项工作的主要结论。
Instabilities described by linear theory characterize an important form of wave–particle interaction in the solar wind. We diagnose unstable behavior of solar wind plasma between 0.3 and 1 au via the Nyquist criterion, applying it to fits of ∼1.5M proton and α particle Velocity Distribution Functions (VDFs) observed by Helios I and II. The variation of the fraction of unstable intervals with radial distance from the Sun is linear, signaling a gradual decline in the activity of unstable modes. When calculated as functions of the solar wind velocity and Coulomb number, we obtain more extreme, exponential trends in the regions where collisions appear to have a notable influence on the VDF. Instability growth rates demonstrate similar behavior, and significantly decrease with Coulomb number. We find that for a nonnegligible fraction of observations, the proton beam or secondary component might not be detected, due to instrument resolution limitations, and demonstrate that the impact of this issue does not affect the main conclusions of this work.
DOI: 10.3847/2041-8213/ab4adc
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影响因子: --
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Lloyd D. Woodham;R. Wicks;D. Verscharen;C. Owen;B. Maruca;B. Alterman
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