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首页> 外文期刊>The Astrophysical journal >TEMPORAL EVOLUTION OF A STREAMER COMPLEX: CORONAL AND IN SITU PLASMA PARAMETERS
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TEMPORAL EVOLUTION OF A STREAMER COMPLEX: CORONAL AND IN SITU PLASMA PARAMETERS

机译：串联复合物的时间演化：冠状和原位等离子体参数

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摘要

We report on observations acquired by the Ultraviolet Coronagraph Spectrometer (UVCS) aboard the Solar and Heliospheric Observatory (SOHO), from 2000 June 10 to June 17 at the time of a SOHO-Sun-Ulysses quadrature. UVCS took data at 1.6 and 1.9 R_☉ with a slit normal to the solar radius and centered along the radial to Ulysses. A streamer complex was sampled by UVCS throughout the quadrature campaign, giving us the opportunity to derive plasma parameters in different streamers and to compare them with plasma properties measured in situ. Large Angle Spectroscopic Coronagraph images above 2 R_☉ helped us understand the temporal evolution of the streamer complex. We derive densities, temperatures, and elemental abundances in two streamers, which have different temperatures and element abundances. In spite of these differences, both structures have the same first ionization potential (FIP) bias. The Fe/O ratio, which may be considered a proxy for the FIP effect, was measured in situ by the Solar Wind Ion Composition Spectrometer aboard the Ulysses spacecraft. Values of Fe/O measured in the corona at the sites where in situ plasma originated agree with in situ Fe/O values.
机译：我们报告了2000年6月10日至6月17日SOHO-Sun-Ulysses正交时由紫外线日冕光谱仪（UVCS）在太阳和日球天文台（SOHO）上获得的观测结果。 UVCS在1.6和1.9R_☉处获取数据，并有一条垂直于太阳半径的狭缝，并沿径向延伸至尤利西斯。 UVCS在整个正交运动期间对流光复合体进行采样，这使我们有机会获得不同流光中的血浆参数，并将其与现场测量的血浆特性进行比较。大于2R_☉的大角度光谱日冕图像有助于我们理解拖缆配合物的时间演变。我们得出了具有不同温度和元素丰度的两个拖缆中的密度，温度和元素丰度。尽管存在这些差异，但两种结构都具有相同的第一电离势（FIP）偏压。 Fe / O比，可以被认为是FIP效应的替代物，是由尤利西斯号航天器上的太阳风离子组成光谱仪原位测量的。在原位等离子体产生部位的电晕中测得的Fe / O值与原位Fe / O值一致。

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