标题： 太阳耀斑中电离和中性物种之间的漂移速度的观测检测 显示英文标题

标题： Observational detection of drift velocity between ionized and neutral species in solar prominences

摘要： 我们报告了使用2012年9月在德国真空望远镜（特内里费岛天文台）获得的高分辨率光谱数据，在日珥中检测到离子和中性粒子速度的差异。 同时使用两种具有不同电离状态元素的谱线，即CaII 8542 A和HeI 10830 A，获得了太阳日珥一小部分的时间序列扫描，具有高时间分辨率。 对这两条谱线的位移、宽度和振幅进行了仔细比较，以提取等离子体的动力学信息。 检测到许多动力学特征，如反向流动、喷流和传播波。 在所有情况下，我们发现从两种元素谱线中提取的参数之间存在非常强的相关性，证实两者追踪的是相同的等离子体。 然而，我们也发现了短暂的瞬态现象，在这些现象中这种相关性会消失。 这些瞬态现象与离子-中性粒子漂移速度有关，其速度约为几百米每秒。 非零漂移速度的区域在时间和距离图中表现出相干性。 显示英文摘要

摘要： We report a detection of differences in ion and neutral velocities in prominences using high resolution spectral data obtained in September 2012 at the German Vacuum Tower Telescope (Observatorio del Teide, Tenerife). A time series of scans of a small portion of a solar prominence was obtained simultaneously with a high cadence using the lines of two elements with different ionization states, namely the CaII 8542 A and the HeI 10830 A. Displacements, widths and amplitudes of both lines were carefully compared to extract dynamical information about the plasma. Many dynamical features are detected, such as counterstreaming flows, jets and propagating waves. In all the cases we find very strong correlation between the parameters extracted from the lines of both elements, confirming that both trace the same plasma. Nevertheless, we also find short-lived transients where this correlation is lost. These transients are associated with the ion-neutral drift velocities of the order of several hundred m/s. The patches of non-zero drift velocity show coherence on time-distance diagrams.