Polarization and Dispersion Analysis of ULF Waves in the Magnetosheath Using Cluster Data

Details Polarization and Dispersion Analysis of ULF Waves in the Magnetosheath Using Cluster Data Polarization and Dispersion Analysis of ULF Waves in the Magnetosheath Using Cluster Data

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsm11b0430n&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SM11B-0430

Other

0689 Wave Propagation (4275), 2728 Magnetosheath

Scientific paper

We analyzed ULF wave events in which the Cluster spacecrafts crossed the magnetosheath region. Using single spacecraft data, we investigated polarization properties such as degree of polarization, ellipticity, ratio of perpendicular to parallel component in the magnetic field fluctuation, and wave propagation angle at each frequency by means of minimum variance analysis, and coherency between plasma data (e.g.., velocity and density) and magnetic field data as well. Then we investigated wave number vector at each frequency by means of a wave telescope technique using multi-spacecraft data. We found that the wave propagation angles obtained from the wave telescope technique were fairly comparable with the angles that were obtained from the minimum variance analysis. The results from these methods can be compensated with one another and synthesized by associating polarization properties and coherency with the wave number vectors. This opens a new way to decompose dispersion relations that can be obtained from multi-spacecraft data analysis into different branches of wave modes.

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