Hybrid code simulations of the solar wind interaction with Pluto

Details Hybrid code simulations of the solar wind interaction with Pluto Hybrid code simulations of the solar wind interaction with Pluto

Mar 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009jgra..11403220d&link_type=abstract

Journal of Geophysical Research, Volume 114, Issue A3, CiteID A03220

Physics

3

Planetary Sciences: Comets And Small Bodies: Interactions With Solar Wind Plasma And Fields, Planetary Sciences: Comets And Small Bodies: Plasma And Mhd Instabilities (2149, 2752, 7836), Planetary Sciences: Comets And Small Bodies: Atmospheres (1060), Planetary Sciences: Comets And Small Bodies: Ionospheres (2459), Planetary Sciences: Comets And Small Bodies: Comets: Dust Tails And Trails (6210)

Scientific paper

Pluto's low gravity implies that the atmosphere is only weakly bound and that significant hydrodynamic outflow can exist. Though surface spectroscopy of Pluto has revealed methane frost, the dominant escaping neutral gas is thought to be N2. These escaping neutrals are photoionized, and the heavy ions (N2 +) move away from Pluto in the direction perpendicular to the solar wind flow (i.e., nearly unmagnetized relative to the length scales of the plasma interaction region). The turning distance of the solar wind protons at the magnetic pileup boundary is large compared to the interaction region. As a result, large ion gyroradius effects determine Pluto's highly asymmetric interaction with the solar wind. We use a three-dimensional hybrid code (fluid electrons, kinetic ions) to investigate the geometry of the interaction region for a variety of possible atmospheric escape rates in anticipation of the New Horizons encounter with Pluto. We find considerable structuring in the wake region due to bi-ion waves and Kelvin-Helmholtz waves. The shock structures vary from a simple Mach cone for low escape rates (~2 × 1026 s-1) to a full detached bow shock for large escape rates (~2 × 1028 s-1).

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