2003 Fiscal Year Final Research Report Summary
STUDY OF ELECTROMAGNETIC RADIATION FROM ELECTROSTATIC' SOLITARY WAVES IN SPACE PLASMAS
| Project/Area Number |
13440143
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Space and upper atmospheric physics
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| Research Institution | KYOTO UNIVERSITY |
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Principal Investigator |
OMURA Yoshiharu Kyoto University, Radio Science Center for Space and Atmosphere, Professor, 宙空電波科学研究センター, 教授 (50177002)
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| Co-Investigator(Kenkyū-buntansha) |
MATSUMOTO Hiroshi Kyoto University, Radio Science Center for Space and Atmosphere, Professor, 宙空電波科学研究センター, 教授 (00026139)
KOJIMA Hirotsugu Kyoto University, Radio Science Cente for Space and Atmosphere, Associate professor, 宙空電波科学研究センター, 助教授 (10215254)
USUI Hideyuki Kyoto University, Radio Science Center for Space and Atmosphere, Associate professor, 宙空電波科学研究センター, 助教授 (10243081)
MUKAI Toshinori Institute of Space and Astronautical Science, Professor, 太陽系プラズマ研究系, 教授 (60013695)
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| Project Period (FY) |
2001 – 2003
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| Keywords | electrostatic solitary wave / GEOTAIL / plasma waves / computer simulation / induced electric field / MPI / electrostatic potential / space plasmas |
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| Research Abstract |
We have developed a new method to realize an efficient absorbing boundary for ele'ctro hagnetic particle simulations with a minimal size of the damping region. We have also developed a new algorithm of the charge conservation method for current density calculation, which substantially reduced the computation. We have demonstrated existence of higher harmonics of Langmuir waves enhanced by an electron beam by a newly developed Vlasov code. In an open system with the absorbing boundaries, we traced a long time and long distance evolution of the electron beam instability, showing formation of electrostatic solitary waves and their coupling with oblique whistler waves and lower, hybrid waves, which are localized in the region close to the electron beam generation region. In the two dimensional system, we find the electrostatic solitary waves are accompanied by electromagnetic components due to the localized current driven by the ExB drift associated with the perpendicular electric field of two-dimensional electrostatic potentials. We found an electron beam formation through Buneman instability driven by an induced electric field in the boundary layers of the magnetosphere. The structure and characteristics of electrostatic waves were analyzed theoretically, and the analysis was also extended to a three dimensional model. We obtained the necessary conditions for existence of isolated three-dimensional potentials.
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