Particle Acceleration and Wave Turbulence During Ionospheric Modification

9314409将进行戈德曼相关的新理论研究，以支持目前的电离层修改实验。具体的焦点将是粒子的加速和空间不均匀的影响，这些影响与由HF修改器在电离层中激发的强朗缪尔和离子声波湍流有关。这项新的理论研究是由在PR阿雷西博上空的电离层修改过程中进行的气辉、非相干散射和钡释放实验推动的。在系统地发展了合适的、可行的一维理论加速模型后，电子在强朗缪尔湍流加速下的速度分布的平均能量和平均力矩将被计算出来。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些高能电子是否可以解释在电离层修改期间观察到的氧气辉。理论和计算研究的一般领域是朗缪尔湍流。根据这项赠款开展的研究预计也将与激光-等离子体相互作用物理和自然发生的空间等离子体中光束激发的朗缪尔湍流有关。***

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. ***