Co-rotation - Kyokaiten

Japanese: 共回転 - きょうかいてん
Co-rotation - Kyokaiten

...At the upper boundary of the plasmasphere, called the plasmapause, the plasma density changes suddenly, and a decrease of more than one order of magnitude from 102-103 particles /cm3 to 1-10 particles/cm3 is observed in a narrow region of about 0.1 RE . The plasma in this region rotates with the Earth's rotation (this is called corotation). Meanwhile, in the region outside the plasmapause, large-scale convection occurs due to the electric field and momentum supplied by the solar wind. ...

*Some of the terminology explanations that mention "co-rotation" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…プラズマポーズplasmapauseと呼ばれるプラズマ圏の上側境界では,プラズマの密度が急激に変わり,102~103個/cm3から1~10個/cm3への1けた以上の減少が0.1REくらいの狭い領域で観測される。この領域のプラズマは,地球の自転とともに回転している(これを共回転という)。一方,プラズマポーズより外側の領域では,太陽風から供給された電場や運動量のため大規模な対流が生じている。…

※「共回転」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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