Collaborative Research: Analysis and Modeling of Nonlinear Wave-Particle Interactions from the Siple Transmitter Experiment

合作研究：单发射机实验中非线性波粒相互作用的分析和建模

• 批准号: 1542608
• 负责人: Mark Golkowski
• 金额: $ 24.29万
• 依托单位: University of Colorado at Denver
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2016
• 资助国家: 美国
• 起止时间: 2016-08-01 至 2020-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1542608&HistoricalAwards=false
• 关键词: Collaborative; Research; Analysis; Modeling; Nonlinear

The Siple Transmitter Experiment, operated in Antarctica from 1973 to 1988 under sponsorship from the National Science Foundation, provided scientific researchers with a heretofore unmatched opportunity to perform controlled experiments to study nonlinear wave-particle interactions. Very low frequency waves radiated by the transmitter at the Antarctic Siple Station propagated into the Earth?s magnetosphere where they interacted with the energetic electrons in the Radiation Belts. This interaction modified the waves, amplifying them and generating new rising and falling frequency components. The modified waves were observed with radio receivers on the ground at the Northern Hemisphere conjugate points of the same geomagnetic field line. These "triggered" waves bear similarities to naturally occurring "chorus" type waves that are a major driver of space weather processes. The data were recorded and later digitized under the Air Force Research Laboratory data-preservation award. Analyzing this legacy dataset with modern techniques and comparing observations to the latest numerical models will help resolve outstanding issues in space weather research. Whistler-mode waves are the electromagnetic waves with frequency of about 100 Hz-30 kHz, observed in Earth?s magnetosphere, and they are one of the major factors significantly affecting the energetic electrons population in the Earth's Radiation Belts. Despite many decades of active research, important questions on the whistler waves interaction with energetic electrons in the Radiation Belts still remain unanswered, which does not allow us to predict reliably the intensity of energetic electron fluxes in the Radiation Belts. These fluxes of energetic particles may significantly affect spacecraft in the geostationary and low orbits, astronauts in the space station, as well space-based scientific, military, and communication satellites. This project will study previously accumulated collection of data from the Siple Transmitter Experiment. Statistical analysis of these data in combination with numerical simulations will be used to characterize the dynamics of nonlinear interactions of whistler waves with energetic particles, focusing on the wave growth and generation of newly triggered emissions. This data analysis will guide advanced numerical simulations of the wave-particle interactions in order to understand fundamental physical processes involved, such as generation of naturally occurring plasma waves called "chorus" and "hiss" and also electromagnetic ion cyclotron waves. This research project will enhance infrastructure for research and education through a strong collaboration between two academic institutions and contribute to the training of graduate and undergraduate students.

在国家科学基金会的赞助下，从1973年至1988年在南极洲进行了SIPLE发射器实验，为科学研究人员提供了迄今无与伦比的机会，可以执行受控的实验来研究非线性波颗粒相互作用。非常低的频率波由发射机在南极siple站辐射到地球磁层中，它们与辐射带中的能量电子相互作用。这种相互作用修改了波浪，扩大了波浪并产生新的上升和下降频率成分。 在同一地磁田间线的北半球偶联点的地面上观察到了修改的波。 这些“触发”波与自然发生的“合唱”型波有相似之处，这是太空天气过程的主要驱动力。记录了数据，然后根据空军研究实验室数据保护奖进行数字化。通过现代技术分析此旧数据集并将观察结果与最新数值模型进行比较将有助于解决太空天气研究中的杰出问题。 惠斯勒模式波是在地球磁层中观察到的频率约为100 Hz-30 kHz频率的电磁波，它们是地球辐射带中能量电子总体的主要因素之一。尽管进行了数十年的积极研究，但有关惠斯勒波与辐射带中能量电子相互作用的重要问题仍未得到解答，这不允许我们可靠地预测辐射带中能量电子通量的强度。这些能量颗粒的通量可能会显着影响地静止和低轨道，空间站中的宇航员，以及太空的科学，军事和通信卫星。该项目将研究先前从Siple发射器实验中累积的数据收集。将这些数据与数值模拟结合的统计分析将用于表征惠斯勒波与能量颗粒的非线性相互作用的动力学，重点是波的生长和新触发的排放的生成。该数据分析将指导波颗粒相互作用的高级数值模拟，以了解所涉及的基本物理过程，例如生成自然存在的血浆波，称为“合唱”和“ HISS”，以及电磁离子循环基因旋转膜波。该研究项目将通过两个学术机构之间的强有力合作来增强研究和教育的基础设施，并为研究生和本科生的培训做出贡献。