Banana-polarized solitons in anisotropic plasmas related to Ulysses observations

Details Banana-polarized solitons in anisotropic plasmas related to Ulysses observations Banana-polarized solitons in anisotropic plasmas related to Ulysses observations

Jun 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3411109s&link_type=abstract

Geophysical Research Letters, Volume 34, Issue 11, CiteID L11109

Physics

3

Interplanetary Physics: Mhd Waves And Turbulence (2752, 6050, 7836), Interplanetary Physics: Plasma Waves And Turbulence, Interplanetary Physics: Solar Wind Plasma, Magnetospheric Physics: Mhd Waves And Instabilities (2149, 6050, 7836), Planetary Sciences: Comets And Small Bodies: Plasma And Mhd Instabilities (2149, 2752, 7836)

Scientific paper

Localized magnetic compressions associated with a rotation in the magnetic field direction have recently been reported after surveying Ulysses high-resolution data. Although the observed structures have similarities to usual Hall-MHD solitons, the banana-type polarization of the described rare events is a decisive signature which counts against such an interpretation. The present paper considers stationary wave forms in an anisotropic plasma with different temperatures parallel (T $\parallel$ ) and transverse (T $\perp$ ) to the ambient magnetic field in the phase velocity gap between the slow and the intermediate mode. It is shown that for slow solar wind conditions (A = T $\parallel$ /T $\perp$ >1 and β $\perp$ ~ 1) bright solitons with banana-type polarization (``bright bananas'') exist which in many respects resemble the observed Ulysses magnetic events. The necessary condition for the appearance of ``bright bananas'' is that the slow mode becomes faster than the intermediate mode which is achieved for sufficiently strong temperature anisotropy A.

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