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Acceleration and dynamics of energetic particles in the Jovian magnetosphere

木星磁层中高能粒子的加速和动力学

基本信息

批准号：
12440129
负责人：
MORIOKA Akira
金额：
$ 8.06万
依托单位：
Tohoku University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2001
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-12440129/
关键词：
energetic particles Jovian magnetosphere Jovian radiation belt synchrotron radiation Jovian radio waves particle dynamics relativistic particles antenna

项目摘要

To study the acceleration and dynamics of energetic particles in the Jovian magnetosphere, the development of the observation system for Jovian synchrotron radiation was performed.(1) After the improvement and adjustment of the observation system, the performance experiments was carried out. And the system has been established.(2) The software for the automatic operation, including the phase and gain calibration was successfully completed, which are essential to detect the absolute intensity of the Jovian synchrotron radiation for a long term.(3) The simultaneous observations of the Jovian synchrotron radiation at Kiso and Fuji observatories, Nagoya University, using the 327 MHz radio telescopes were carried out, and detected the daily variation of the radiation.(4) From the analyzes of the energetic particle data provided from NASA database, the response of the Jovian magnetopause for the solar wind variation and particle boundary in the Jovian magnetosphere were derived.(5) The data analyzes of the Ulysses spacecraft, the periodic modulation of Jovian energetic electrons with the period of about 40 min was discovered in interplanetary space(6) The dynamics of the earth's radiation belts was studied as the counter part of the Jovian radiation belt. From the detailed investigation of energetic electrons, unexpected pitch angle distributions in the equatorial region in the inner magnetosphere were discovered, which is strongly related to the intense plasma waves called EPWAT (equatorial plasma wave turbulence).(7) The dynamics of the outer radiation belt associated with magnetic storms was studied, and proposed the mechanism to accelerate hot electrons to relativistic energies through the interaction with the storm time whistler mode waves.

为了研究木星磁层中高能粒子的加速和动力学，开发了木星同步加速器辐射观测系统。(1)在对观测系统进行改进和调整后，进行了性能试验。并且系统已经建立。(2)完成了包括相位和增益标定在内的自动运行软件的设计，这对长期探测木星同步辐射绝对强度是必不可少的。(3)在名古屋大学木曾和富士天文台用327兆赫射电望远镜同时观测了木星同步辐射，并探测到了辐射的日变化。(4)利用NASA数据库提供的高能粒子观测资料，分析了木星磁层顶对太阳风变化和木星磁层粒子边界的响应。(5)通过对木星探测器数据的分析，发现了木星高能电子在行星际空间存在周期约为40 min的周期调制。（6）研究了地球辐射带的动力学，作为木星辐射带的对立面。通过对高能电子的详细观测，发现了内磁层赤道区的俯仰角分布，这与赤道等离子体波湍流（Equatorial Plasma Wave Turbulence，EPWAT）密切相关。(7)研究了与磁暴有关的外辐射带动力学，提出了通过与暴时哨声波相互作用将超热电子加速到相对论能量的机制。