Generation of cosmic-ray protons at collisionless shocks via hybrid particle-in-cell simulations

2017 Fiscal Year Final Research Report

• Project/Area Number: 26287041
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: Nagoya University
• Principal Investigator: UMEDA TAKAYUKI 名古屋大学, 宇宙地球環境研究所, 講師 (40432215)
• Co-Investigator(Renkei-kenkyūsha): SHOJI Masafumi 名古屋大学, 宇宙地球環境研究所, 特任助教 (80722082) ; NARIYUKI Yasuhiro 富山大学, 人間発達科学部, 准教授 (50510294) ; MATSUKIYO Shuichi 九州大学, 大学院総合理工学研究院, 准教授 (00380709) ; SAITO Shinji 名古屋大学, 大学院理学研究科, 特任准教授 (60528165) ; YAMAZAKI Ryo 青山学院大学, 理工学部, 教授 (40420509)
• Research Collaborator: WADA Yasutaka 名古屋大学, 大学院工学研究科 ; NAKAMURA Takuma オーストリア科学アカデミー, 宇宙科学研究所, 研究員
• Project Period (FY): 2014-04-01 – 2018-03-31
• Keywords: 粒子加速 / 宇宙線 / プラズマ科学 / 超高層物理学 / 高エネルギー天文学 / 高性能計算

Outline of Final Research Achievements

The computational speed of the particle-in-cell-type plasma simulation codes is accelerated by using the counting sort algorithm and the array-particle data structure. Large-scale two-dimensional particle-in-cell simulations are carried out by using the improved code for studying non-stationarity of perpendicular shocks called the reformation. The result implies that the existence of the reformation is controlled by types of micro-instabilities at the shock transition layer.
One- and two-dimensional particle simulations are also carried out on the development of a large-amplitude whistler-mode waves in the shock transition layer. Relativistic electron acceleration is found in the 1D run. On the other hand, a rapid decay of whistler-mode waves through a new instability is found in the 2D run, which suppress the relativistic electron acceleration.

Free Research Field

計算科学