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Shine调查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学的信息。恒星风的生产对于其他天体物理系统以及了解地球和其他行星系统所遵守的太阳风很重要。作为Shine-Gem联络人的主要研究者，在两个研究社区之间传达了太阳能/太阳能问题和地理空间问题，并活跃于Los Alamos太空天气暑期学校，他的研究调查被用来创建学生研究项目这三年的光泽调查将改善太阳风的外层模型的物理，并将决定这些改进如何影响太阳风的特性和驱动驱动的exobase。主要的进步将是替换行星际电位的静态（在太阳的参考框架中），其电势由在太阳风等离子体中传播的多个弱双层组成。离子对移动电势结构的反应发生了变化（而不是太阳势结构）将导致：（1）质子和重离子的终端速度变化，而重离子是电子速度分布函数在Exobase处的函数（2）（2 ）加速太阳风的相关总静电电位的相关变化，（3）离子加速时加热而不是冷却，（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外层模型中潜力的形式将导致更正确的模型，并应克服现有Exosphere模型的几个缺点。作为此Shine项目的基本部分，将运行PIC等离子体模拟，以辨别太阳能双层的关键特性作为Exosphere模型的输入。