SHINE: Turbulence and Perpendicular Ion Heating in the Corona and Solar Wind

闪耀：日冕和太阳风中的湍流和垂直离子加热

• 批准号: 0851005
• 负责人: Benjamin Chandran
• 金额: $ 34.61万
• 依托单位: University of New Hampshire
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-07-01 至 2013-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0851005&HistoricalAwards=false
• 关键词: SHINE; Turbulence; Perpendicular; Ion; Heating

The PI will investigate the role of turbulent heating in the origin and dynamics of the solar wind. He will use a combination of 'weak' and 'strong' turbulence theory to investigate the strength of the so-called "quasi-parallel cascade." The small scale waves produced by the quasi-parallel cascade have very high frequencies, and can cause perpendicular ion heating via a cyclotron resonance. The PI will also use high accuracy test particle calculations to investigate perpendicular ion heating by low frequency "quasi-2D" turbulence, which is believed to be the energetically dominant component of solar wind turbulence. The PI will then incorporate these results into a 1D fluid model of the solar wind that solves for the radial evolution of the turbulence and plasma properties. He will test and validate his theoretical results by comparing the 1D fluid model to observations of the temperature profile, temperature anisotropy, and bulk flow speeds of protons, electrons, alpha particles, and minor ions in the corona and solar wind.This project addresses a key element of the Solar, Heliospheric, and INterplanetary Environment (SHINE) research program, which is to gain an understanding of the mechanisms of solar wind heating and to incorporate them into global models, with the objective of reproducing the observed properties of the solar wind. The PI is a Science Working Group Leader for the SHINE community and a new member of the SHINE Steering Committee, where he helps organize SHINE community workshops. He will continue his active involvement as an instructor at specialized summer and winter schools for graduate students, postdoctoral researchers, and advanced undergraduate students at the University of New Hampshire (UNH). By providing young scientists with specialized training and exposure to recent developments in solar physics research, these topical schools promote the integration of research and education at UNH.

PI将研究湍流加热在太阳风的起源和动力学中的作用。他将结合‘弱’和‘强’湍流理论来研究所谓的“准平行叶栅”的强度。准平行级联产生的小尺度波具有很高的频率，可以通过回旋共振引起垂直离子加热。PI还将使用高精度的测试粒子计算来研究低频“准2D”湍流对垂直离子的加热，这被认为是太阳风湍流的能量主导成分。然后PI将把这些结果合并到太阳风的一维流体模型中，该模型解决了湍流和等离子体属性的径向演化问题。他将通过将一维流体模型与日冕和太阳风中质子、电子、阿尔法粒子和次离子的温度分布、温度各向异性和整体流动速度的观测进行比较来测试和验证他的理论结果。该项目致力于太阳、日光层和星际环境(SINE)研究计划的一个关键元素，该计划旨在了解太阳风加热的机制并将其纳入全球模型，目的是再现太阳风的观测特性。PI是SHARE社区的科学工作组组长，也是SHARE指导委员会的新成员，在那里他帮助组织SHARE社区研讨会。他将继续积极参与新汉普郡大学(UNH)专门为研究生、博士后研究人员和高级本科生开设的夏季和冬季专门学校的讲师工作。通过为青年科学家提供专门培训和接触太阳物理研究的最新发展，这些专题学校促进了UNH的研究和教育的一体化。