Microinstabilities at perpendicular collisionless shocks: A comparison of full particle simulations with different ion to electron mass ratio
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- Takayuki Umeda
- Nagoya University 1 Solar-Terrestrial Environment Laboratory, , Nagoya 464-8601, Japan
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- Yoshitaka Kidani
- Nagoya University 1 Solar-Terrestrial Environment Laboratory, , Nagoya 464-8601, Japan
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- Shuichi Matsukiyo
- Kyushu University 2 Earth System Science and Technology, , Kasuga 816-8580, Japan
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- Ryo Yamazaki
- Aoyama Gakuin University 3 Department of Physics and Mathematics, , Sagamihara 252-5258, Japan
Description
<jats:p>A full particle simulation study is carried out for studying microinstabilities generated at the shock front of perpendicular collisionless shocks. The structure and dynamics of shock waves are determined by Alfvén Mach number and plasma beta, while microinstabilities are controlled by the ratio of the upstream bulk velocity to the electron thermal velocity and the plasma-to-cyclotron frequency. Thus, growth rates of microinstabilities are changed by the ion-to-electron mass ratio, even with the same Mach number and plasma beta. The present two-dimensional simulations show that the electron cyclotron drift instability is dominant for a lower mass ratio, and electrostatic electron cyclotron harmonic waves are excited. For a higher mass ratio, the modified two-stream instability is dominant and oblique electromagnetic whistler waves are excited, which can affect the structure and dynamics of collisionless shocks by modifying shock magnetic fields.</jats:p>
Journal
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- Physics of Plasmas
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Physics of Plasmas 19 (4), 042109-, 2012-04-01
AIP Publishing
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Keywords
Details 詳細情報について
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- CRID
- 1360848658828896640
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- ISSN
- 10897674
- 1070664X
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- Data Source
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- Crossref
- KAKEN
- OpenAIRE
