A laboratory study of ion energization by EIC waves and subsequent upstreaming along diverging magnetic field lines

Details A laboratory study of ion energization by EIC waves and subsequent upstreaming along diverging magnetic field lines A laboratory study of ion energization by EIC waves and subsequent upstreaming along diverging magnetic field lines

Jul 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jgr....91.8025c&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 91, July 1, 1986, p. 8025-8033. Research supported by the Research Corp.

Physics

10

Earth Ionosphere, Earth Magnetosphere, Electrostatic Waves, Ion Cyclotron Radiation, Lines Of Force, Space Plasmas, Conics, Energy Transfer, Ion Temperature

Scientific paper

A laboratory study related to energetic upstreaming ions in the ionosphere-magnetosphere system is described. The experiment was carried out in a cesium Q machine plasma with a region of nonuniform magnetic field. Electrostatic ion cyclotron waves were excited by drawing an electron current to a small biased exciter electrode. In the presence of the instability, ions are heated in the direction perpendicular to B. Using a gridded retarding potential ion energy analyzer, the evolution of the ion velocity distribution was followed as the ions passed through the heating region and subsequently flowed out along the diverging B field lines. As expected, the heated ions transfer their energy from perpendicular to parallel motion as they move through the region of diverging B field. Both their parallel thermal energy and the parallel drift energy increase at the expense of the perpendicular energy.

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