On the Nature of a Large-Amplitude Alfven Wave Measured by the WIND Spacecraft

Details On the Nature of a Large-Amplitude Alfven Wave Measured by the WIND Spacecraft On the Nature of a Large-Amplitude Alfven Wave Measured by the WIND Spacecraft

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsh43c1957w&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SH43C-1957

Physics

Plasma Physics

[7836] Space Plasma Physics / Mhd Waves And Instabilities, [7863] Space Plasma Physics / Turbulence

Scientific paper

We present, for the first time, measurements of arc-polarized velocity variations associated with a large-amplitude Alfven wave that was observed by the WIND satellite. The trace of the magnetic field variance within a period of 35 minutes is larger than the variance of the average magnetic field. When moving into the deHoffman-Teller frame (which was hardly ever used before in solar wind wave studies), we find that the magnetic-field and velocity vector components in the plane perpendicular to the minimum-variance direction of the magnetic field are arc-polarized, and their tips lie on the same circle. We also find that the normalized cross-helicity and Alfven ratio of the wave are both nearly equal to unity, a result which has not been reported in previous studies at 1 AU. The power spectrum for this pure large-amplitude Alfven wave exhibits Kolmogorov's 5/3-law. To explain these results requires new theoretical efforts and is worth further data analysis, using the present methods in future studies of solar wind turbulence.

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