Physics
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994georl..21.1595a&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 21, no. 15, p. 1595-1598
Physics
31
Cyclotron Frequency, Electrostatic Waves, Field Aligned Currents, Ion Cyclotron Radiation, Magnetohydrodynamic Stability, Plasma Density, Plasma Frequencies, Plasma Turbulence, Earth Ionosphere, Earth Magnetosphere, Geomagnetism
Scientific paper
Fluctuations in plasma density are observed in the ion-cyclotron frequency range in a Q-machine plasma column at values of magnetic-field-aligned current significantly below the critical value for current-driven electrostatic ion-cyclotron (CDEIC) waves. These fluctuations arise from the inhomogeneous energy-density driven (IEDD) instability, are relatively broadband, and can have large amplitude compared to CDEIC fluctuaions. These results impact the interpretation of ion heating and acceleration in the ionosphere, especially at low-altitude where magnetic-field-aligned current densities estimated to be large enough to be supercritical to current-driven or beam-driven electrostatic ion-cyclotron waves are rarely detected.
Amatucci William E.
Carroll J. III J.
Koepke Mark E.
Sheridan T. E.
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