Comment on "Mode Conversion of Waves In The Ion-Cyclotron Frequency Range in Magnetospheric Plasmas"

Kim, Eun¹  Johnson, J. R.¹ 

[1] Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)

关键词: Space Plasma Physics;    Wave Absorption;   

DOI  :  10.2172/1128922
RP-ID  :  PPPL--5003
PID  :  OSTI ID: 1128922

学科分类：原子、分子光学和等离子物理

美国|英语

来源: SciTech Connect

【 摘 要 】

Recently, Kazakov and Fulop [1] studied mode conversion (MC) at the ion-ion hybrid (IIH) resonance in planetary magnetospheric plasmas by simplifying the dispersion relation of the fast wave (FW) modes to describe a cutoff-resonance (CR) pair near the IIH resonance, which can be reduced to a Budden problem. They suggested that when the IIH resonance frequency (??S) approaches the crossover frequency (??cr), and the parallel wavenumber (k???) is close to the critical wavenumber k* ???(??S = ??cr), MC can be efficient for arbitrary heavy ion density ratios. In this Comment, we argue that (a) the FW dispersion relation cannot be simplified to the CR pair especially near ??cr because in many parameter regimes there is a cutoff-resonance-cutoff (CRC) triplet that completely changes the wave absorption; and (b) the maximum MC efficiency does not always occur near k??? ??? k*??????.