Particle Acceleration and Wave Turbulence During Ionospheric Modification

电离层修改过程中的粒子加速和波湍流

• 批准号: 9314409
• 负责人: Martin Goldman
• 金额: $ 22.5万
• 依托单位: University of Colorado at Boulder
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-11-01 至 1997-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9314409&HistoricalAwards=false
• 关键词: Particle; Acceleration; Wave; Turbulence; During

9314409 Goldman Relevant new theoretical research will be performed in support of current ionospheric modification experiments. The specific focus will be on acceleration of particles and effects of spatial nonuniformity in connection with strong Langmuir and ion-acoustic wave turbulence excited in the ionosphere by an HF modifier. The new theoretical research has been motivated by airglow, incoherent scatter, and barium release experiments performed during ionospheric modification over Arecibo, PR. The mean energy and moments of the velocity distriubtion of electrons accelerated by strong Langmuir turbulence iwll be computer after systematic development of appropriate and workable theoretical acceleration models in one dimension. Numerical simulations will be based on modified versions of existing 2-time- scale fluid codes, and will be calibrated against kinetic simulations. A goal will be to determine whether or not such energetic electrons can account for the oxygenic airglowobserved during ionospheric modification. The general area of theoretical and computational research is Langmuir turbulence. Research performed under this grant is expected to be relevant also to laser-plasma interaction physics and to beam-excited Langmuir turbulence in naturally-occurring space plasmas. ***

9314409戈德曼将进行相关的新理论研究，以支持目前的电离层改造实验。 具体的重点将是粒子的加速和空间不均匀性的影响与强朗缪尔和离子声波湍流在电离层中激发的HF修改器。 新的理论研究是在Arecibo电离层改造期间进行的气辉、非相干散射和钡释放实验的激发下进行的。在系统地发展了适当的和可行的一维理论加速模型后，将计算出强朗缪尔湍流加速电子的平均能量和速度分布的矩。 数值模拟将基于现有2时间尺度流体代码的修改版本，并将根据动力学模拟进行校准。 一个目标将是确定这种高能电子是否可以解释电离层修改期间观察到的含氧气辉。理论和计算研究的一般领域是朗缪尔湍流。 根据这项赠款进行的研究预计也将与激光等离子体相互作用物理学和自然发生的空间等离子体中的光束激发朗缪尔湍流有关。 ***