Generation of Polarized Shear Alfvén Waves by a Rotating Magnetic Field Source

Details Generation of Polarized Shear Alfvén Waves by a Rotating Magnetic Field Source Generation of Polarized Shear Alfvén Waves by a Rotating Magnetic Field Source

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm21a1657g&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SM21A-1657

Physics

Plasma Physics

2704 Auroral Phenomena (2407), 7800 Space Plasma Physics, 7829 Kinetic Waves And Instabilities

Scientific paper

It is widely known that shear Alfvén waves play an important role in auroral physics and it has been suggested that they might even power the aurora. Recent experiments conducted in the Large Plasma Device (LAPD) have added to our basic understanding of these high amplitude waves. We report on the generation and characterization of field aligned, polarized, kinetic shear Alfvén waves radiated from a rotating magnetic field source created via a novel phased orthogonal loop antenna. Both right and left hand polarization's are generated at a wide range of frequencies from 0.01≤ω/Ωci≤1.0. Propagation parallel to the background magnetic field at the Alfvén velocity is observed along with a negligible parallel wave magnetic field component implying a shear mode. The magnitude of the waves magnetic field is on the order of 0.4% of the background field. Small amplitude second harmonic generation is seen along with indirect evidence of electron heating and/or fast electrons during the pulse implying non- linear response. The work was supported by ONR MURI Grant N000140710789.

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