Effect of local interstellar medium hydrogen fractional ionization on the distant solar wind and interface region

Details Effect of local interstellar medium hydrogen fractional ionization on the distant solar wind and interface region Effect of local interstellar medium hydrogen fractional ionization on the distant solar wind and interface region

Aug 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995jgr...10014755b&link_type=abstract

Journal of Geophysical Research, Volume 100, Issue A8, p. 14755-14762

Physics

92

Interplanetary Physics: Heliopause And Solar Wind Termination, Interplanetary Physics: Interplanetary Shocks, Interplanetary Physics: Interstellar Gas, Interplanetary Physics: Solar Wind Plasma

Scientific paper

The paper investigates the influence of the local interstellar medium (LISM) proton number density on the gasdynamics of LISM/solar wind interaction. It uses the self-consistent axisymmetric model of Baranov and Malama (1993) for a constant value of the LISM neutral hydrogen number density (nH∞=0.14 cm-3). It is shown that the flow structure is asymmetric relative to the upwind and downwind directions. Numerical results are presented for four values of the proton number density in the LISM: np∞=0.005 0.025; 0.1; and 0.28 cm-3. The results are given along the axis of symmetry only (in upwind and downwind directions). Velocity, number density, and temperature distributions of the plasma component as well as of the H atoms of the LISM are presented. It is shown that the influence of H atoms, penetrating from the LISM into the solar system on the solar wind may be strong enough to be observed by the ``Voyager'' spacecraft. The results show that the number density of the LISM's plasma component as well as of the solar wind has very large gradients in the interface region (between the bow and termination shocks). This effect may be very important for the interpretation of the kHz radiation detected by ``Voyager.'' Moreover, the asymmetric (in upwind and downwind directions) distributions of H atom number density, bulk velocity, and temperature may be observed on the basis of the scattered solar Lyman alpha radiation data.

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