CAREER: Understanding Collisionless Magnetic Reconnection as a Fundamental Heliospheric Process

职业：理解无碰撞磁重联作为基本的日光层过程

• 批准号: 2338131
• 负责人: Colby Haggerty
• 金额: $ 57.43万
• 依托单位: University of Hawaii
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2024
• 资助国家: 美国
• 起止时间: 2024-02-01 至 2029-01-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2338131&HistoricalAwards=false
• 关键词: CAREER; Understanding; Collisionless; Magnetic; Reconnection

Magnetic reconnection is a fundamental plasma process that occurs throughout the heliosphere. Reconnection efficiently converts magnetic energy into particle energy and likely plays a critical role in dissipating energy in systems where collisions are infrequent, such as the solar corona, turbulent solar wind, and Earth’s magnetosphere. Because of this, a detailed kinetic description of magnetic reconnection is necessary for understanding fundamental heliospheric processes, including solar flares, turbulence dissipation, and solar wind-magnetospheric interaction. This CAREER project seeks to understand how collisionless physics modifies the process of magnetic reconnection. The education component includes mentoring student research (high school through graduate students), public outreach, and the development of a High-Performance Computing workshop for undergraduate students in Hawai’i.This research seeks to understand how collisionless physics modifies the process of magnetic reconnection and how this manifests in the heliosphere. The research addresses the following three key Science Objectives (SO): SO#1: Determine how a velocity shear alters collisionless magnetic reconnection. Understand how an increasing shear velocity modifies the reconnection characteristic (i.e., reconnection rate, outflow velocity, and heating relate) in the kinetic limit. SO#2: Understand the role of increased inflowing ion and electron temperature in magnetic reconnection in anti-parallel and guide field configurations. SO#3: Identify the effects of energetic, non-thermal electrons on the reconnection process. Reconnection is likely an efficient source of non-thermal electrons, which may feedback on the reconnecting system. These objectives will be achieved with a combination of theory, kinetic modeling, and observations.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

磁重联是发生在整个日球层的基本等离子体过程。重联有效地将磁能转化为粒子能，在碰撞不频繁的系统中，如日冕、湍流太阳风和地球磁层，重联可能在耗散能量方面起着关键作用。正因为如此，磁重联的详细动力学描述对于理解太阳层的基本过程是必要的，包括太阳耀斑、湍流耗散和太阳风-磁层相互作用。这个CAREER项目旨在了解无碰撞物理如何改变磁重联的过程。教育部分包括指导学生研究（从高中到研究生），公共宣传，以及为夏威夷的本科生开发高性能计算研讨会。这项研究旨在了解无碰撞物理是如何改变磁重联过程的，以及这在日球层是如何表现出来的。该研究解决了以下三个关键科学目标（SO）： SO#1：确定速度剪切如何改变无碰撞磁重联。了解不断增加的剪切速度如何在动力学极限下改变重联特性（即重联速率、流出速度和加热相关）。SO#2：了解在反平行和引导场配置中，增加的流入离子和电子温度在磁重联中的作用。SO#3：确定高能非热电子对重连过程的影响。重联可能是一种有效的非热电子源，它可能对重联系统产生反馈。这些目标将通过理论、动力学建模和观测相结合来实现。该奖项反映了美国国家科学基金会的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。