title: Observation of inverse ion-cyclotron damping induced by parallel-velocity shear.
abstract: The generation of broadband multiharmonic spectra of electrostatic ion-cyclotron waves is demonstrated in a magnetized laboratory plasma in which shear in the magnetic-field-aligned (parallel) ion flow and a relative parallel electron drift are present. Shear correlates with an increased number of harmonics and a decreased electron drift speed. Wave and particle measurements indicate that cyclotron damping is reduced and even becomes negative. The fluctuations in the time domain are spiky, similar to electric-field fluctuations observed both in Earth's auroral zone and in numerical simulations.
authors.affiliation: Physics Department, West Virginia University, Morgantown 26506-6315, USA.
authors.forename: C
authors.initials: C
authors.lastname: Teodorescu
authors.forename: E W
authors.initials: EW
authors.lastname: Reynolds
authors.forename: M E
authors.initials: ME
authors.lastname: Koepke