Plasma Jet Formation by Collision of Two Shock Waves and by Collision of Two Magnetic Flux Tubes(Gases, Plasmas and Electric Discharges)
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概要
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We present numerical simulations of plasma jet formation by using a novel 2.5 dimension MHD code, employing the Artificial Wind concept which allows to construct simple upwind shock-capturing schemes. Firstly we investigate the formation process of a plasma jet by the collision of two shock waves propagating at some angle between the fronts and we compare our results with the theory. We found that there appear three cases for the jet formation : (1) Heat dominated, (2) Jet-Heat, and (3) Jet dominated case, depending on the parameters of the collision angle and the shock velocity. We also found that even in the case where the two flows behind the colliding shock fronts are both a sub-sonic, the super-sonic plasma jet still appears there. Next we investigate the generation process of super-sonic plasma jet during direct collision of two magnetic flux tubes. We found that super-sonic plasma jets appear in a wide range of parameters. From many parameter runs we concluded that there are three important physical parameters governing the condition of super-sonic jet formation, namely, the colliding velocity, the colliding angle and the density in the flux tubes. The most important condition among them is that the density in the colliding flux tubes exceeds about 50 times the background density. We also found that the super-sonic plasma jets can be generated through magnetic reconnection, when two magnetic flux tubes with densities about 9 times higher than their surround are colliding. Our findings will help to better understand the complicated dynamics of the solar transition region.
- 社団法人日本物理学会の論文
- 2004-07-15
著者
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SAKAI Jun-ichi
Laboratory for Plasma Astrophysics and Fusion Science, Department of Electronics and Information, Fa
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Sokolov Igor
Space Physics Research Laboratory University Of Michigan
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MASUDA Takamasa
Laboratory for Plasma Astrophysics, Faculty of Engineering, Toyama University
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Masuda Takamasa
Laboratory For Plasma Astrophysics Faculty Of Engineering Toyama University
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SAKAI Jun-Ichi
Laboratory for Plasma Astrophysics, Faculty of Engineering, Toyama University
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