Linearly polarized magnetic fluctuations at comet Giacobini-Zinner

Details Linearly polarized magnetic fluctuations at comet Giacobini-Zinner Linearly polarized magnetic fluctuations at comet Giacobini-Zinner

Dec 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jgr....9113699g&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 91, Dec. 1, 1986, p. 13699-13703. DOE-supported research.

Physics

27

Giacobini-Zinner Comet, Linear Polarization, Magnetic Variations, Drift, Ion Beams, Low Frequencies, Magnetic Poles

Scientific paper

The fully electromagnetic linear Vlasov dispersion equation for instabilities in a homogeneous, magnetized plasma is solved. Parameters appropriate to conditions observed during the ICE encounter with comet Giacobini-Zinner are used to study the polarization of electromagnetic instabilities driven by the relative streaming of two ion components. If the ion/ion relative drift is near the Alfvén speed, the associated long-wavelength modes may be approximately linearly polarized at relatively small angles of propagation with respect to the magnetic field. The relatively inhomogeneous plasma background of the comet may impose such oblique propagation, so that this result provides an alternate explanation to the observations of linearly polarized waves near the comet.

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