SHINE: Compound Solar Energetic Particle Events in the Heliosphere: Data Analysis and Modeling

SHINE：日光层中的复合太阳高能粒子事件：数据分析和建模

• 批准号: 0648181
• 负责人: David Lario
• 金额: $ 31.35万
• 依托单位: Johns Hopkins University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-04-01 至 2011-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0648181&HistoricalAwards=false
• 关键词: SHINE; Compound; Solar; Energetic; Particle

Interplanetary magnetic structures affect solar energetic particle (SEP) transport processes and shape the time-intensity histories of SEP events. Improved understanding of processes leading to major compound SEP events is necessary to determine the most extreme radiation environments in the inner heliosphere. Therefore, the PI will investigate how the state of the interplanetary medium influences the development of major SEP events in the inner heliosphere, how and when the energetic particle 'streaming limit' is violated, and what factors lead to the formation of energetic particle reservoirs. The PI's team will use energetic particle, plasma, and magnetic field data from a number of spacecraft (Cassini, ACE, IMP-8, GOES, Ulysses, Voyagers 1 and 2) to study the largest SEP events of the last three solar cycles. They will investigate the state of the inner heliosphere during these major events, the conditions that preceded SEP intensities exceeding the streaming limit, and the processes that formed energetic particle reservoirs in the inner heliosphere. The PI will model particle transport conditions in compound SEP events using numerical solutions of the transport equation for the evolution of the energetic particle distribution function. This numerical model includes the effects of solar wind convection, pitch-angle scattering, pitch-angle focusing, and adiabatic deceleration under the conditions in which multiple SEP events occur. The results of this research will be broadly disseminated in the form of publications, presentations at annual SHINE meetings, as well as at other workshops and seminars. The majority of research will be carried out by the PI and a summer intern college student. This research will also directly benefit the engineering teams that need to estimate the impact of SEPs on both space instrumentation and human space-flight.

行星际磁结构影响太阳高能粒子 (SEP) 传输过程并塑造 SEP 事件的时间强度历史。为了确定日光层内部最极端的辐射环境，必须更好地了解导致主要复合 SEP 事件的过程。 因此，PI将研究行星际介质的状态如何影响日球层内部主要SEP事件的发展，高能粒子“流动极限”如何以及何时被违反，以及哪些因素导致高能粒子库的形成。 PI 的团队将使用来自多个航天器（卡西尼号、ACE、IMP-8、GOES、尤利西斯号、航海者 1 号和 2 号）的高能粒子、等离子体和磁场数据来研究过去三个太阳周期中最大的 SEP 事件。 他们将研究这些重大事件期间日光层内部的状态、SEP强度超过流动极限之前的条件，以及在日光层内部形成高能粒子库的过程。 PI 将使用输运方程的数值解来模拟复合 SEP 事件中的粒子输运条件，以实现高能粒子分布函数的演化。 该数值模型包括多个 SEP 事件发生条件下太阳风对流、俯仰角散射、俯仰角聚焦和绝热减速的影响。这项研究的结果将以出版物、年度 SHINE 会议以及其他讲习班和研讨会上的演示的形式广泛传播。 大部分研究将由 PI 和一名暑期实习大学生进行。这项研究还将直接使需要估计 SEP 对空间仪器和载人航天影响的工程团队受益。