Electron Temperature Inversion by Stimulated Brillouin Scattering During Electron Gyroharmonic Heating at EISCAT

• Published in: Geophysical Research Letters
• Main Authors: Fu, H. Y., Jiang, M. L., Wang, K. N., Wu, J., Li, Q.L., Rietveld, Michael T, Varberg, E., Häggström, I., Jin, Y.-Q.
• Format: Article in Journal/Newspaper
• Language: English
• Published: Wiley 2020
• Subjects: VDP::Mathematics and natural science: 400::Geosciences: 450; VDP::Matematikk og Naturvitenskap: 400::Geofag: 450; EISCAT
• Online Access: https://hdl.handle.net/10037/21246; https://doi.org/10.1029/2020GL089747

This paper was published by AGU. Copyright 2020 American Geophysical Union. This work reports a holistic experimental investigation of stimulated Brillouin scattering (SBS) features and electron temperature inversion near the third electron gyroharmonic 3 f ce using the European Incoherent Scatter (EISCAT) heating facility. The evolution of SBS features including spectral offset, width, and power varies asymmetrically near 3 f ce . The asymmetries among SBS, electron temperature, and high frequency-enhanced ion lines are clearly exhibited for pumping above f 0 ≥ 3 f ce . Electron temperature T e at the resonance regime has been retrieved from the measured SBS spectra based on the wave matching theory. The inversion results by SBS are consistent with measurement by the EISCAT UHF incoherent scatter radar (ISR) at the resonance altitude. The comparison of electron temperature T e and ion temperature T i between SBS and ISR enlightens great potentials for developing realistic ionospheric diagnostic technique.