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- W4283273812 abstract "Electron cyclotron harmonic (ECH) waves, potential drivers for diffuse aurora precipitation, have been extensively investigated for decades. The generation mechanism of ECH waves, however, remains an open question. Theoretical work in 1970s has demonstrated that ECH waves can be excited by loss cone distributions of hot plasma sheet electrons. Recent THEMIS spacecraft observations, however, indicate that the waves can also be excited by low energy electron beams. Utilizing interferometry techniques to analyze the phase difference between electric potentials measured by individual probes on Electric Field Instrument antenna pairs on THEMIS spacecraft, we compute the wavenumber of both beam-driven ECH waves and loss-cone-driven ECH waves. These wavenumber measurements as well as other wave properties obtained from spacecraft measurements prove to be consistent with expectation from linear instability analysis. This provides us with independent verification of the generation mechanism and linear dispersion relation of beam-driven and loss-cone-driven ECH waves. Our statistical results demonstrate that the median value of the wave vectors of beam-driven ECH waves, characterized by wave normal angles () less than 80°, is 0.011 m−1; and that of loss-cone-driven ECH waves, characterized by wave normal angles larger than 85°, is 0.00765 m−1. Direct wavenumber measurements of ECH waves allow us to better understand the interaction between ECH waves and electrons in Earth's magnetosphere." @default.
- W4283273812 created "2022-06-23" @default.
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- W4283273812 date "2022-07-01" @default.
- W4283273812 modified "2023-10-13" @default.
- W4283273812 title "Wavelength Measurements of Electron Cyclotron Harmonic Waves in Earth's Magnetotail" @default.
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- W4283273812 doi "https://doi.org/10.1029/2022ja030500" @default.
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