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Implications of Near Solar Source Pickup Ions

近太阳源拾取离子的影响

基本信息

批准号：
0100659
负责人：
Nathan Schwadron
金额：
$ 28.79万
依托单位：
Regents of the University of Michigan - Ann Arbor
依托单位国家：
美国
项目类别：
Continuing Grant
财政年份：
2001
资助国家：
美国
起止时间：
2001-09-01 至 2002-09-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=0100659&HistoricalAwards=false
关键词：
Implications Near Solar Source Pickup

项目摘要

The investigators will study major heliospheric pickup ion sources in the solar wind, their propagation and acceleration. Pickup ions are generated from neutral atoms when they become ionized and begin to gyrate in a plasma's magnetic field. In the case of the solar wind, pickup ions born from slowly moving neutrals acquire an initial speed nearly equal to the solar wind speed as they are transported out with the solar wind's magnetic field. The pickup process thereby creates a more energetic and therefore more easily observed population of ions that may be used to infer properties of the neutral environment from which they were created. In the heliosphere, there are three main populations of pickup ions: interstellar pickup ions from interstellar neutrals, inner source pickup ions created by interactions between interplanetary dust and the solar wind, and discrete source pickup ions from comets, planets, and other discrete sources. The investigators will characterize near-solar pickup ion sources by modeling distribution functions and hydrodynamic properties of pickup ions produced from near-solar and interstellar sources. They will also study the relative significance of near-solar source pickup ions, interstellar source pickup ions, and solar wind particles as seed populations for energetic particles and anomalous cosmic rays.

研究人员将研究太阳风中主要的日光层拾取离子源，它们的传播和加速。当中性原子被电离并开始在等离子体的磁场中旋转时，就会产生拾取离子。在太阳风的情况下，从缓慢移动的中性粒子产生的拾取离子获得的初始速度几乎等于太阳风的速度，因为它们被太阳风的磁场输送出去。因此，拾取过程产生更有能量且因此更容易观察的离子群体，其可用于推断产生它们的中性环境的性质。在日光层中，有三种主要的拾取离子群：来自星际中性粒子的星际拾取离子，由行星际尘埃和太阳风之间的相互作用产生的内部源拾取离子，以及来自彗星，行星和其他离散源的离散源拾取离子。研究人员将通过模拟近太阳和星际源产生的拾取离子的分布函数和流体动力学特性来表征近太阳拾取离子源。他们还将研究近太阳源拾取离子，星际源拾取离子和太阳风粒子作为高能粒子和异常宇宙射线的种子种群的相对重要性。