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SHINE: Physics of the Interplanetary Electric Potential and Modifications to Exosphere Models of the Solar Wind

SHINE：行星际电势的物理学和太阳风外逸层模型的修改

基本信息

批准号：
1723416
负责人：
Joseph Borovsky
金额：
$ 36万
依托单位：
SPACE SCIENCE INSTITUTE
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2017
资助国家：
美国
起止时间：
2017-09-01 至 2021-08-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1723416&HistoricalAwards=false
关键词：
SHINE Physics Interplanetary Electric Potential

项目摘要

This SHINE Investigation focuses on the production of stellar winds and will provide information about the physics of double layers in natural plasmas. Stellar winds production is important for other astrophysical systems as well as understanding the solar wind that the Earth and other planetary systems are subject to. The Principal Investigator in acts as a SHINE-GEM Liaison where solar/solar-wind issues and geospace issues are communicated between two research communities and is active in the Los Alamos Space Weather Summer School where his research investigations have been used to create student research projects.This 3-year SHINE Investigation will make improvements to the physics of exosphere models of the solar wind and will determine how those improvements affect the properties of the solar wind and the exobase that drives it. The major advance will be to replace a static (in the Sun's reference frame) interplanetary potential with a potential made up of multiple weak double layers propagating in the solar wind plasma. The changed reaction of ions to moving potential structures (instead of a Sun-stationary potential structure) will result in: (1) changed terminal velocities for the protons and heavy ions as a function of the electron velocity distribution function at the exobase, (2) a related change in the total electrostatic potential needed to accelerate the solar wind, (3) heating, rather than cooling, of the ions as they are accelerated, (4) differences in the outward acceleration of protons and heavy ions. Using multiple double layers as the form of the potential in exosphere models for the interplanetary electric field will result in a more-physically correct model and should overcome several of the shortcomings that existing exosphere models have. As a fundamental part of this SHINE project, PIC plasma simulations will be run to discern critical properties of solar-wind double layers as inputs to the exosphere model.

这项研究的重点是恒星风的产生，并将提供有关自然等离子体中双层物理的信息。恒星风的产生对其他天体物理系统以及理解地球和其他行星系统所受的太阳风都很重要。首席研究员在两个研究界之间就太阳/太阳风问题和地球空间问题进行交流，并活跃在洛斯阿拉莫斯空间天气暑期学校，在那里他的研究调查已被用于创建学生研究项目。这项为期3年的SINE调查将对太阳风的外层模型的物理进行改进，并将确定这些改进如何影响太阳风的特性和驱动它的外部数据库。主要的进展将是用在太阳风等离子体中传播的多个弱双层组成的势来取代静态的(在太阳的参考系中)行星际势。离子对移动势能结构(而不是太阳静止势能结构)的反应将导致：(1)质子和重离子的末端速度随外基面电子速度分布函数的变化，(2)加速太阳风所需的总静电势的相关变化，(3)加速时离子的加热而不是冷却，(4)质子和重离子向外加速的差异。使用多个双层作为行星际电场的系外层模型中的势的形式，将产生一个更物理上正确的模型，并应克服现有系外层模型的几个缺点。作为SISH项目的一个基本部分，PIC等离子体模拟将被用来辨别太阳风双层的临界性质，作为地外层模型的输入。