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[PEM15-12] Feedback instability in the magnetosphere-ionosphere coupling with collision-induced velocity shear
Keywords:aurora, magnetosphere-ionosphere coupling, feedback instability
In this work, we have found the feedback unstable solutions even in the case with vertical inhomogeneity of the ionosphere by solving an eigenvalue problem. The exponentially growing solution exists in the M-I coupling model with the velocity shear induced by the Pedersen mobility varying with the ionospheric altitude. The present result confirms validity of the conventional M-I coupling model with the height-integrated ionosphere, at least for the low-frequency modes.
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