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- W4313655908 abstract "Shear mode Alfvén waves are the carriers of field-aligned currents in the auroral zones of Earth and other planets. These waves travel along the magnetic field lines, coupling the outer magnetosphere with the ionosphere. However, in ideal magnetohydrodynamic (MHD) theory, the shear mode Alfvén wave does not carry a parallel electric field that could accelerate auroral particles. This can be modified by including kinetic effects, which lead to a parallel electric field when the perpendicular wavelength becomes comparable to the electron inertial length or the ion acoustic gyroradius. These small perpendicular wavelengths can be formed by phase mixing, ionospheric feedback, or nonlinear effects. Kinetic Alfvén waves are further constrained by their interaction with the ionosphere, which acts as a reflector for these waves. In addition, the strong plasma gradients in the topside ionosphere form an effective resonator that leads to fluctuations on time scales of seconds. These rapidly changing parallel electric fields can lead to broadband acceleration of auroral electrons, often called the Alfvénic aurora. Such interactions do not only take place in Earth's magnetosphere, but have also been observed in Jupiter's magnetosphere by the Juno satellite." @default.
- W4313655908 created "2023-01-07" @default.
- W4313655908 creator A5040593636 @default.
- W4313655908 date "2023-01-07" @default.
- W4313655908 modified "2023-09-26" @default.
- W4313655908 title "Kinetic Alfvén waves and auroral particle acceleration: a review" @default.
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