Doppler radar observations of harmonics of electrostatic ion cyclotron waves in the auroral ionosphere

Details Doppler radar observations of harmonics of electrostatic ion cyclotron waves in the auroral ionosphere Doppler radar observations of harmonics of electrostatic ion cyclotron waves in the auroral ionosphere

Jul 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jgr....93.7409p&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 93, July 1, 1988, p. 7409-7424. NSERC-supported research.

Physics

11

Auroral Ionization, Auroral Zones, Doppler Radar, Electrostatic Waves, Harmonics, Ion Cyclotron Radiation, Doppler Effect, E Region, Electron Beams, Fourier Transformation, Ionospheric Drift, Power Spectra, Spectral Resolution

Scientific paper

High-resolution Doppler spectra, obtained on a few short-lived (0.5-sec to 1-min) scattering events during August 1983 and 1986 with cross-beamed 50-Mhz CW Doppler radars, are shown to be highly structured, displaying bursts of power at very short-lived discrete frequencies whose separation most often equaled the ion cyclotron frequency of O2(+) or NO(+). Discrete spectral peaks could be found at Doppler velocities as high as 2500 m/s. These transient events were closely correlated with intense auroral arc brightenings and/or the onset of an auroral breakup. Numerical solutions of the kinetic dispersion, performed for a range of ionospheric parameters, revealed that both the higher and lower harmonics of electrostatic ion cyclotron waves can become unstable, indicating that some of the rapid time variation of the observed spectral peaks in the transient events can be explained by an accompanying change in ionospheric parameters.

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