Large-scale two-dimensional (2D) full particle-in-cell (PIC) simulations are carried out for studying the relationship between the dynamics of a perpendicular shock and microinstabilities generated at the shock foot. The structure and dynamics of collisionless shocks are generally determined by Alfven Mach number and plasma beta, while microinstabilities at the shock foot are controlled by the ratio of the upstream bulk velocity to the electron thermal velocity and the ratio of the plasma-to-cyclotron frequency. With a fixed Alfven Mach number and plasma beta, the ratio of the upstream bulk velocity to the electron thermal velocity is given as a function of the ion-to-electron mass ratio. The present 2D full PIC simulations with a relatively low Alfven Mach number (MA ∼ 6) show that the modified two-stream instability is dominant with higher ion-to-electron mass ratios. It is also confirmed that waves propagating downstream are more enhanced at the shock foot near the shock ramp as the mass ratio becomes higher. The result suggests that these waves play a role in the modification of the dynamics of collisionless shocks through the interaction with shock front ripples.
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February 2014
Research Article|
February 06 2014
Dynamics and microinstabilities at perpendicular collisionless shock: A comparison of large-scale two-dimensional full particle simulations with different ion to electron mass ratio
Takayuki Umeda;
Takayuki Umeda
a)
1
Solar-Terrestrial Environment Laboratory, Nagoya University
, Nagoya 464-8601, Japan
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Yoshitaka Kidani;
Yoshitaka Kidani
1
Solar-Terrestrial Environment Laboratory, Nagoya University
, Nagoya 464-8601, Japan
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Shuichi Matsukiyo;
Shuichi Matsukiyo
b)
2
Earth System Science and Technology, Kyushu University
, Kasuga 816-8580, Japan
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Ryo Yamazaki
Ryo Yamazaki
c)
3
Department of Physics and Mathematics, Aoyama Gakuin University
, Sagamihara 252-5258, Japan
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c)
Email: ryo@phys.aoyama.ac.jp
Phys. Plasmas 21, 022102 (2014)
Article history
Received:
September 09 2013
Accepted:
January 16 2014
Citation
Takayuki Umeda, Yoshitaka Kidani, Shuichi Matsukiyo, Ryo Yamazaki; Dynamics and microinstabilities at perpendicular collisionless shock: A comparison of large-scale two-dimensional full particle simulations with different ion to electron mass ratio. Phys. Plasmas 1 February 2014; 21 (2): 022102. https://doi.org/10.1063/1.4863836
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