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

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 (...

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Bibliographic Details
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
Description
Summary: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.

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