4.1 Article

Mode conversion of extraordinary waves in stratified plasmas with an external magnetic field perpendicular to the directions of inhomogeneity and wave propagation

Journal

JOURNAL OF THE KOREAN PHYSICAL SOCIETY
Volume 79, Issue 8, Pages 717-724

Publisher

KOREAN PHYSICAL SOC
DOI: 10.1007/s40042-021-00298-6

Keywords

Mode conversion; Resonant absorption; Plasma heating; Magnetized plasma; Upper hybrid resonance

Funding

  1. National Research Foundation of Korea - Korean Government [NRF-2020R1A2C1007655]
  2. Basic Science Research Program through the National Research Foundation of Korea - Ministry of Education [NRF-2020R1A6A3A01098816]

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In this theoretical study, mode conversion and resonant absorption of high-frequency electromagnetic waves into longitudinal modes in magnetized and stratified plasmas are investigated. It is found that mode conversion only occurs for extraordinary waves, and the mode conversion coefficient can be close to one in certain parameter ranges. The results suggest strong asymmetry under sign changes of the incident angle and external magnetic field, with implications for plasma heating phenomena.
We study theoretically the mode conversion and the resonant absorption of high-frequency electromagnetic waves into longitudinal modes in magnetized and stratified plasmas in the case where the external magnetic field is perpendicular to both the directions of inhomogeneity and wave propagation. Mode conversion is shown to occur only when the waves are extraordinary waves. We develop an efficient method for calculating the mode conversion coefficient for arbitrary spatial configurations of the plasma density and the external magnetic field in a numerically exact manner using the invariant imbedding method. We calculate the mode conversion coefficient extensively as a function of the incident angle, the external magnetic field, and the plasma density in the incident region. We show that there is strong asymmetry under the sign change of the incident angle and the external magnetic field and find that the mode conversion coefficient is close to one in certain ranges of the parameter values. We discuss the implications of our results in plasma heating phenomena.

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