Collaborative Research: SHINE: Understanding the Connection between the Abundance of Helium in the Interplanetary Medium and the Origin of the Solar Wind in the Corona

合作研究：SHINE：了解行星际介质中氦的丰度与日冕中太阳风的起源之间的联系

• 批准号: 0327723
• 负责人: Alan Lazarus
• 金额: --
• 依托单位: Massachusetts Institute of Technology
• 依托单位国家: 美国
• 项目类别: Continuing grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-10-01 至 2005-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0327723&HistoricalAwards=false
• 关键词: Collaborative; Research; SHINE; Understanding; Connection

Two new features in the variation of the relative abundance of helium to hydrogen in the solar wind have recently been observed by the WIND spacecraft: (i) This ratio is a linear function of the solar wind speed in the range from 250 km/s to 550 km/s, and (ii) The ratio undergoes a six-month periodic modulation in the sense that the maximum in He/H at a fixed solar wind speed occurs at the times when the Earth is most distant from the heliographic equator. This study will use this newly discovered effect as the basis for a thorough investigation of the connection between coronal and solar wind plasmas spanning observations by five different spacecraft taken over the last 30 years. Collaborations will be developed with investigators from these other spacecraft and with theorists and numerical modelers to connect the interplanetary observations of the He/H ratio back to its solar origins. These features present challenges to the currently accepted paradigm of solar wind. The abundance of helium is a sensitive test of models of solar wind formation and of the underlying connections between solar photospheric, coronal and interplanetary magnetic fields.

WIND航天器最近观测到太阳风中氦与氢的相对丰度变化的两个新特征：（i）这一比率是太阳风速度在250公里/秒至550公里/秒范围内的线性函数，和（ii）该比率经历六个月的周期性调制，在这个意义上，He/在太阳风速度固定的情况下，当地球距离日面赤道最远时，太阳风的速度会达到1.3H。 这项研究将利用这一新发现的效应作为基础，对过去30年来五个不同航天器观测到的日冕和太阳风等离子体之间的联系进行彻底调查。 将与来自这些其他航天器的研究人员以及理论家和数值建模者开展合作，将行星际He/H比的观测与其太阳起源联系起来。 这些特征对目前公认的太阳风模式提出了挑战。 氦的丰度是对太阳风形成模型以及太阳光球、日冕和行星际磁场之间潜在联系的敏感测试。