Physics – Plasma Physics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm13a1594l&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SM13A-1594
Physics
Plasma Physics
[2724] Magnetospheric Physics / Magnetopause And Boundary Layers, [2752] Magnetospheric Physics / Mhd Waves And Instabilities, [2753] Magnetospheric Physics / Numerical Modeling, [7839] Space Plasma Physics / Nonlinear Phenomena
Scientific paper
2-D hybrid simulations are used to investigate how fast-mode compressional waves incident on a magnetopause current layer mode convert both linearly and nonlinearly to short wavelength (k⊥ρi ~1) kinetic Alfven waves (KAWs) near the Alfven resonance surface. The background magnetic fields on both sides of the current layer are parallel, tangential to the magnetopause normal, corresponding to a northward interplanetary magnetic field. We examine how the mode conversion depends on wave frequency ω0, wave vector k, Alfven velocity profile (particularly the magnetopause width), ion β in the magnetosheath, electron-to-ion temperature ratio, and incident wave amplitude. Kinetic effects resolve the resonance, and KAWs radiate back to the magnetosheath side of the current layer while decay on the magnetospheric side. The compressional wave absorption rate is estimated and compared with linear theory. Unlike the prediction from low-frequency theory of the Alfven resonance, KAWs are generated also in cases with θ=0° provided ω0 > 0.1Ω0, where θ is the tilt angle of the magnetic field relative to the plane of k and Ω0 is the ion gyrofrequency in the magnetosheath. As the incident wave amplitude is increased, several nonlinear wave properties are manifest in the mode conversion process. Harmonics of the driver frequency are generated. As a result of nonlinear wave interaction, the mode conversion region and its spectral width are broadened. The nonlinear waves provide a significant transport of momentum across the magnetopause and are associated with significant ion heating in the resonant region.
Johnson Jesse
Lin Yangtin
Wang Xinhua
No associations
LandOfFree
Hybrid Simulation of Mode Conversion at the Magnetopause does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Hybrid Simulation of Mode Conversion at the Magnetopause, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Hybrid Simulation of Mode Conversion at the Magnetopause will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1877543