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.

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最远离的赤道赤道。 这项研究将使用这种新发现的效果作为对过去30年中五个不同的航天器进行观测的冠状动脉和太阳风等离子体之间的联系的基础。 将与来自其他航天器的研究人员以及理论家和数字建模者进行合作，以将HE/H比的行星际观测与太阳能起源联系起来。 这些功能对当前公认的太阳风范式提出了挑战。 氦气的丰度是对太阳风形成模型以及太阳光球，冠状和星际磁场之间的基本连接的敏感测试。