Study of wave-particle interactions in space plasmas (Joint research using multiple spacecraft observations and computer experiments)

空间等离子体中波粒相互作用的研究（利用多个航天器观测和计算机实验的联合研究）

基本信息

批准号：
08044075
负责人：
MATSUMOTO Hiroshi
金额：
$ 11.58万
依托单位：
KYOTO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for international Scientific Research
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1997
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08044075/
关键词：
GEOTAIL PWI Plasma waves Conputer experiments WIND POLAR Freja AKEBONO BEN ESW Type III Solar Burst AKR 磁気圏尾部 ISTP

项目摘要

Due to the launch failure, we missed the CLUSTER spacecraft. However, we succeeded to proceed the collaboration among GEOTAIL,WIND,POLAR,Freja, and AKEBONO spacecraft. We performed the simultaneous observations of the Type III solar radio bursts, and 2 fp emissions by GEOTAIL and WIND and we analyzed the propagation features of the Type III solar radio bursts and the source location of the 2 fp emissions. Further, on the AKR emissions, we showed that its source is located at 21-22 MLT based on the collaboration among GEOTAIL,WIND spacecraft and Ray tracing numerical calculations. The modulated Langmuir waves are observed in the tail, solar wind, and polar regions by GEOTAIL,WIND,and Freja spacecraft, respectively. Many theoretical attempts to explain these amplitude modulations have focused on the nonlinear wave-wave coupling, however, they have not succeeded, yet. Our computer experiments succeeded to reproduce the waveforms of these modulated Langmuir waves and showed that the observed amplitude modulations are the result of the spatial modulation of the Langmuir waves due to the trapping effects without the wave-wave interactions. In the collaboration among AKEBONO,Freja spacecraft and the ray tracing, we found that the source region of the Auroral Hiss is located at 11,000km altitude in the polar region. We examined electron velocity distributions corresponding to the observations of the electrostatic solitary waves (ESW). We found the existence of the high energy electrons streaming in the same direction with the ESW.This result is consistent with the BGK potential model which corresponds to the final stage of electron beam instabilities.

由于发布故障，我们错过了群集航天器。但是，我们成功地进行了Geotail，Wind，Polar，Freja和Akebono航天器之间的合作。我们同时观察了III型太阳能无线电爆发，并通过Geotail and Wind进行了2次FP排放，我们分析了III型太阳能无线电爆发的传播特征和2 FP排放的源位置。此外，在AKR排放量上，我们表明其来源位于21-22 MLT，基于Geotail，Wind Aspacecraft和Ray追踪数值计算之间的协作。分别通过Geotail，Wind和Freja航天器在尾巴，太阳风和极性区域中观察到调制的Langmuir波。许多理论试图解释这些振幅调节的尝试都集中在非线性波波耦合上，但是，它们尚未成功。我们的计算机实验成功地重现了这些调制的Langmuir波的波形，并表明观察到的振幅调制是由于没有波波相互作用的捕获效应而导致Langmuir波的空间调制的结果。在Akebono，Freja航天器和射线追踪之间的合作中，我们发现Auroral Hiss的源区域位于极区域的11,000公里高度。我们检查了对应于静电孤立波（ESW）的观测值的电子速度分布。我们发现，高能电子的存在与ESW相同的方向流，这与BGK电位模型一致，BGK电位模型对应于电子束不稳定性的最后阶段。