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首页> 外文期刊>The Astrophysical journal >EMPIRICAL DENSITIES, KINETIC TEMPERATURES, AND OUTFLOW VELOCITIES IN THE EQUATORIAL STREAMER BELT AT SOLAR MINIMUM
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EMPIRICAL DENSITIES, KINETIC TEMPERATURES, AND OUTFLOW VELOCITIES IN THE EQUATORIAL STREAMER BELT AT SOLAR MINIMUM

机译：最低日赤道带皮带的经验密度，运动温度和出流速度

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摘要

We use combined Ultraviolet Coronagraph Spectrometer and Large Angle Spectroscopic Coronagraph data to determine the O~(5+) outflow velocities as a function of height along the axis of an equatorial streamer at solar minimum and as a function of latitude (at 2.3 solar radius from Sun center). The results show that outflow increases rather abruptly in the region between 3.6 and 4.1 solar radius near the streamer cusp and gradually increases to ～90 km s~(-1) at ～5 solar radius in the streamer stalk beyond the cusp. The latitudinal variation at 2.3 solar radius shows that there is no outflow (within the measurement uncertainties) in the center of the streamer, called the core, and that a steep increase in outflow occurs just beyond the streamer legs, where the O Ⅵ λ1032 intensity relative to H Ⅰ λ1216 (Lyα) is higher than in the core. Velocity variations in both height and latitude show that the transitions from no measurable outflow to positive outflow are relatively sharp and thus can be used to infer the location of the transition from closed to open field lines in streamer magnetic field topologies. Such information, including the densities and kinetic temperatures derived from the observations, provides hard constraints for realistic theoretical models of streamers and the source regions of the slow solar wind.
机译：我们结合使用紫外线日冕仪和大角度日冕仪数据来确定O〜（5+）流出速度与赤道拖缆轴高度的函数关系，即太阳最低时和纬度的函数（距太阳2.3半径）太阳中心）。结果表明，在流光尖端的太阳半径3.6至4.1之间的区域内，出水量突然增加，而在流光尖端的约5太阳半径处，流出量逐渐增加至〜90 km s〜（-1）。太阳半径为2.3时的经度变化表明，在拖缆的中心（称为核心）没有流出（在测量不确定性范围内），并且恰好在拖缆支腿（OⅥλ1032强度）以外出现了急剧的流出增加。相对于HⅠλ1216（Lyα）高于核心。高度和纬度的速度变化表明，从无可测量的流出到正流出的过渡相对较尖锐，因此可以用来推断流场磁场拓扑结构中从封闭磁场到开放磁场的过渡位置。这些信息，包括从观测得出的密度和动力学温度，为拖缆和慢太阳风的源区的现实理论模型提供了严格的约束。

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