Composition of the local interstellar cloud from observations of interstellar pickup ions
Composition of the local interstellar cloud from observations of interstellar pickup ions
复制标题
根据星际拾取离子的观测得出局部星际云的组成
DOI：
10.1063/1.1434012
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发表时间：
2002
期刊：
影响因子：
--
通讯作者：
J. Geiss
中科院分区：
文献类型：
--
作者：
G. Gloeckler;J. Geiss
拾取离子的观测为我们提供了一种新的方法来探测日光层内外的偏远地区。对H，He，N，O和Ne的全面和连续的测量，特别是使用太阳风离子成分光谱仪，提供了丰富的数据，用于推断围绕我们太阳系的本地星际云（LIC）的化学和物理特性。我们提出了新的结果的元素组成和电离状态的LIC。比较氦、氮、氧和氖在现今本地星际介质中的丰度与相应的太阳系中这些元素的丰度，我们发现，与LIC中重元素丰度过剩的预期相反，这两种成分大致相同。这表明，自46亿年前太阳形成以来，几乎没有或根本没有额外的星系演化，或者太阳系和LIC中的物质遵循不同的演化路径。
Observations of pickup ions give us a new method to probe remote regions in and beyond the heliosphere. Comprehensive and continuous measurements of H, He, N, O, and Ne especially with the Solar Wind Ion Composition Spectrometer on Ulysses, are providing a wealth of data that are used to infer the chemical and physical properties of the Local Interstellar Cloud (LIC) that surrounds our solar system. We present new results on the elemental composition and ionization state of the LIC. Comparing the abundance of He, N, O and Ne in the present day local interstellar medium to the corresponding solar system abundance of these elements we find that, contrary to expectations of overabundance of heavy elements in the LIC, these two compositions are about the same. This suggests that there has been little or no additional galactic evolution since the formation of the Sun 4.6 billion years ago, or that the materials in the solar system and in the LIC followed different evolutionary paths.