Physics – Plasma Physics
Scientific paper
Jul 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005jgra..11007104f&link_type=abstract
Journal of Geophysical Research, Volume 110, Issue A7, CiteID A07104
Physics
Plasma Physics
20
Interplanetary Physics: Heliopause And Solar Wind Termination, Interplanetary Physics: Neutral Particles (7837), Interplanetary Physics: Interstellar Gas, Interplanetary Physics: Mhd Waves And Turbulence (2752, 6050, 7836), Space Plasma Physics: Ionization Processes (2423)
Scientific paper
The heliopause, a surface separating the tenuous hot heliosheath flow and the dense, magnetized interstellar flow, is subject to instabilities of the Rayleigh-Taylor and Kelvin-Helmholtz types. The dynamic properties of this discontinuity is of considerable importance for understanding the neutral atom and cosmic ray filtration at the interface. Here we investigate the stability of the upwind segment of the heliopause in the presence of charge exchange collisions using both an analytic (dispersion relation) approach and a numerical model that includes the interstellar magnetic field. Linear analysis yields dispersion relations that admit imaginary solutions for a range of wave numbers, implying that the stagnation point on the heliopause is Rayleigh-Taylor unstable to small perturbations propagating parallel to the discontinuity surface. Effects of interstellar and heliosheath atoms are analyzed separately. We confirm our analytic results by performing time-dependent numerical simulations of the nonlinear development of this instability using a multifluid MHD-neutral approach. For typical solar wind and LISM conditions we obtain cyclical evolution of the upwind heliopause with a period of about 100 years. The amplitude of these oscillations is found to be dependent on the presence of hot heliosheath neutrals. We discuss the effect of a strong LISM magnetic field on the heliopause stability and possible implications of the obtained instability on the X-ray emission and cosmic ray transport in the outer heliosphere.
Florinski Vladimir
Pogorelov Nikolai V.
Zank Gary P.
No associations
LandOfFree
Heliopause stability in the presence of neutral atoms: Rayleigh-Taylor dispersion analysis and axisymmetric MHD simulations does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Heliopause stability in the presence of neutral atoms: Rayleigh-Taylor dispersion analysis and axisymmetric MHD simulations, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Heliopause stability in the presence of neutral atoms: Rayleigh-Taylor dispersion analysis and axisymmetric MHD simulations will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1251823