Optical detection of electrostatic ion cyclotron waves in the auroral plasma |
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| Authors: | G Martelli PN Collis M Giles PJ Christiansen |
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| Institution: | Plasma and Space Physics Group, School of Mathematical and Physical Sciences, The University of Sussex, BrightonBN1 9QH, England |
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| Abstract: | 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. We suggest 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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