Abstract
This analytic study investigates the interaction between a large-scale shear Alfvén wave propagating through a low-β plasma and a pre-existing density perturbation of small transverse scale. The interaction forms an in situ antenna that self-consistently generates two field-aligned current channels of opposite polarity. The expansion of the current channels across the confining field is bounded by the cone trajectories of small-scale inertial Alfvén waves. The spatial patterns of the radiated fields are obtained, and the magnitude of the parallel electric field and its effective phase velocity are assessed. An effective cross section that varies with the parallel and transverse scale lengths of the density perturbation summarizes the efficiency of the direct conversion process.
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