MHD Instabilities at the Heliopause

Details MHD Instabilities at the Heliopause MHD Instabilities at the Heliopause

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsh53b1504d&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SH53B-1504

Other

2109 Discontinuities (7811), 2124 Heliopause And Solar Wind Termination, 7599 General Or Miscellaneous, 7811 Discontinuities (2109)

Scientific paper

The heliopause (HP) is the outer edge of the heliosphere which separates the tenuous, hot heliosheath plasma on one side and the relatively dense and cool magnetized interstellar plasma on the other side. As a surface of tangential discontinuity, the HP is subjected to both Rayleigh-Taylor (RT) and Kelvin-Helmholtz (KH) instabilities. The coupling between plasma ions and neutral atoms through the process of charge exchange provides an "effective gravity" at the HP, while a shear flow exists across it. We derive analytically the linearized dispersion relation for waves propagating along the surface of this discontinuity, which represents a combined RT/KH analysis. We investigate the case when the magnetic field is not parallel to the flow and not collinear in both sides of the discontinuity. The linear dispersion relation is analyzed for different parameter regimes. It is found that interstellar and heliospheric magnetic fields can help stabilize the HP for RT and KH-type instabilities.

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