Optical detection of electrostatic ion cyclotron waves in the auroral plasma

Details Optical detection of electrostatic ion cyclotron waves in the auroral plasma Optical detection of electrostatic ion cyclotron waves in the auroral plasma

Jul 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977p%26ss...25..643m&link_type=abstract

Planetary and Space Science, vol. 25, July 1977, p. 643-650.

Physics

2

Auroral Zones, Electrostatic Waves, Ion Cyclotron Radiation, Optical Measurement, Atmospheric Circulation, Birkeland Currents, Brightness, Field Aligned Currents, Frequency Response, Ion Motion, Photomultiplier Tubes, Power Spectra

Scientific paper

Spectral analysis of recent photometric observations has revealed the existence of narrow-frequency-band pulsations in the brightness of some auroras. Peaks in the power spectra between 25 and 32 Hz have been observed. It is suggested that these observations are associated with electrostatic ion cyclotron waves, which are excited when the relative drift between ions and electrons due to field-aligned (Birkeland) currents exceeds a certain critical value.

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