Computer Science – Sound
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsh43a1642f&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SH43A-1642
Computer Science
Sound
2149 Mhd Waves And Turbulence (2752, 6050, 7836), 2159 Plasma Waves And Turbulence, 7509 Corona, 7839 Nonlinear Phenomena (4400, 6944), 7863 Turbulence (4490)
Scientific paper
Solar wind turbulence is an important ingredient in understanding the Sun-Earth connection. It is generally believed that large-amplitude Alfven waves that are pervasively generated at the solar surface transfer their energy to smaller scale fluctuations until the energy is absorbed by the particles, thereby heating and accelerating the solar wind. However, the actual physics of the wave-particle energy exchange process is not very well understood. The controversy lies with the fact that, on the one hand, the observed preferential heating of the ions in the perpendicular direction points to the cyclotron resonant interaction (the parallel cascade paradigm), while on the other, the MHD turbulence theory predicts that the turbulent cascade should involve low-frequency kinetic Alfven waves propagating predominantly across the ambient magnetic field (perpendicular cascade paradigm). This is a long-standing issue and a topic of ongoing research by many scientists. To resolve this issue, one must develop and solve a fully kinetic turbulence theory based upon Vlasov analysis. This presentation will be a progress report on a research program initiated by the present authors about a year ago. We shall present the formal derivation of the foundational theoretical equations of kinetic plasma turbulence theory that includes self-consistent particle kinetic equation and nonlinear wave kinetic equation that describes quasilinear as well as nonlinear wave-wave coupling among ion-sound wave, kinetic Alfven wave, and Alfven-magnetosonic wave. Some preliminary numerical results shall also be presented.
Fang Taotao
Yoon Peter H.
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