Modeling Alfven Waves Generation by a Rotating Magnetic Field Source

Details Modeling Alfven Waves Generation by a Rotating Magnetic Field Source Modeling Alfven Waves Generation by a Rotating Magnetic Field Source

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm53b1376k&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SM53B-1376

Physics

[2471] Ionosphere / Plasma Waves And Instabilities, [2487] Ionosphere / Wave Propagation, [2752] Magnetospheric Physics / Mhd Waves And Instabilities, [2772] Magnetospheric Physics / Plasma Waves And Instabilities

Scientific paper

Recent experiments conducted in the Large Plasma Device (LAPD) located at UCLA demonstrated efficient excitation of whistler and shear Alfven waves by a Rotating Magnetic Fields (RMF) source created by a phased orthogonal loop antenna. This paper presents a combination of computational results along with the experiments that emphasize the RMF properties for generation of MHD waves. In order to understand the RMF and magnetized plasma interaction and the resultant radiation patterns in frequency regimes below the ion cyclotron frequency a three-dimensional code was developed. The time-domain code solves the linearized Maxwell equations coupled to the two fluid magnetohydrodynamics description of cold plasma. The antenna excitation is modeled as a set of external currents. A comparison of the simulation results and the experiments shows good agreement between them. The scaling laws of the induced magnetic field as a function of the RMF frequency, the plasma parameters and the spatial decay rate of magnetic field, as well as the use of RMFs as efficient radiation sources of waves in space plasmas are also discussed. This work was sponsored by ONR MURI Grant 5-28828.

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