Laboratory observations of ion cyclotron waves associated with a double layer in an inhomogeneous magnetic field

Details Laboratory observations of ion cyclotron waves associated with a double layer in an inhomogeneous magnetic field Laboratory observations of ion cyclotron waves associated with a double layer in an inhomogeneous magnetic field

Feb 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jgr....91.1599a&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 91, Feb. 1, 1986, p. 1599-1608. Research supported by Navy and Research C

Physics

26

Electrostatic Waves, Ion Cyclotron Radiation, Magnetohydrodynamic Stability, Nonuniform Magnetic Fields, Plasma Layers, Field Aligned Currents, Plasma Density, Plasma Potentials, Space Plasmas, Wave Excitation

Scientific paper

Observations of coherent electrostatic ion cyclotron (EIC) waves associated with a strong, magnetized double layer are presented. The double layers are produced in a weakly ionized argon plasma by applying a positive potential to an electrode plate located in the diverging magnetic field region of a cylindrical plasma column. Ionization within the electrode sheath is essential to the formation of these double layers. The resulting V-shaped potential structures have extended parallel, oblique and perpendicular (to B) electric field components. The frequency of the ion cyclotron instability is dependent upon the magnetic field strength at the position of the parallel potential structure. The properties of EIC waves in the presence of the double layer are discussed in relation to the possible excitation mechanisms (field-aligned currents, ion and electron beams, and perpendicular E fields).

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