Differences between Doppler velocities of ions and neutral atoms in a solar prominence
Differences between Doppler velocities of ions and neutral atoms in a solar prominence
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日珥中离子和中性原子的多普勒速度之间的差异
DOI：
10.1051/0004-6361/201629979
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发表时间：
2017
影响因子：
6.5
通讯作者：
Anan T
中科院分区：
文献类型：
--
作者：
Anan T
在具有部分电离等离子体的天体物理系统中，离子的运动由磁场控制，而中性粒子只能通过与离子碰撞间接感受到磁场的洛伦兹力。电离和中性物质之间的速度漂移在修改重要的物理过程中起着关键作用，例如磁重联，磁流体动力学波的阻尼，等离子体中角动量通过磁场的传输，本文旨在研究日珥中钙离子和中性氢的多普勒速度差异，以寻找中性氢和钙离子的速度差异。方法利用希达天文台无顶太阳望远镜的高色散摄谱仪同时观测了日珥活动区H Ⅰ 397 nm、H Ⅰ 434 nm、Ca Ⅱ 397 nm和Ca Ⅱ 854 nm的光谱。我们比较了多普勒速度，来自移动的谱线的峰值推测从光学薄plasma.ResultsThere的情况下，中性原子和离子之间的速度差异是显着的，例如1433事件（~3%的组比较配置文件）与中性氢原子和钙离子之间的速度差异大于3σ的测量误差。然而，我们也发现，从同一物种发射的两条谱线的多普勒速度之间的显着差异，和相同的物种之间的速度差的概率密度函数的中性原子和离子之间的差异并不显着conclusions我们解释的多普勒速度的差异是由于不同的组件在日珥沿着视线的运动，而不是中性原子与等离子体的去耦。
ContextIn astrophysical systems with partially ionized plasma, the motion of ions is governed by the magnetic field while the neutral particles can only feel the magnetic field’s Lorentz force indirectly through collisions with ions. The drift in the velocity between ionized and neutral species plays a key role in modifying important physical processes such as magnetic reconnection, damping of magnetohydrodynamic waves, transport of angular momentum in plasma through the magnetic field, and heating.AimsThis paper aims to investigate the differences between Doppler velocities of calcium ions and neutral hydrogen in a solar prominence to look for velocity differences between the neutral and ionized species.MethodsWe simultaneously observed spectra of a prominence over an active region in H I 397 nm, H I 434 nm, Ca II 397 nm, and Ca II 854 nm using a high dispersion spectrograph of the Domeless Solar Telescope at Hida observatory. We compared the Doppler velocities, derived from the shift of the peak of the spectral lines presumably emitted from optically-thin plasma.ResultsThere are instances when the difference in velocities between neutral atoms and ions is significant, for example 1433 events (~3% of sets of compared profiles) with a difference in velocity between neutral hydrogen atoms and calcium ions greater than 3σof the measurement error. However, we also found significant differences between the Doppler velocities of two spectral lines emitted from the same species, and the probability density functions of velocity difference between the same species is not significantly different from those between neutral atoms and ions.ConclusionsWe interpreted the difference of Doppler velocities as being a result of the motions of different components in the prominence along the line of sight, rather than the decoupling of neutral atoms from plasma.
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