Solar cycle heliospheric interface variations: influence of neutralized solar wind

N. A. Zaitsev (1), V. V. Izmodenov (2)

(1) Keldysh Institute of Applied Mathematics, Russian Academy of Sciences, (2) Department of Aeromechanics and Gas Dynamics, Faculty of Mechanics and Mathematics, Lomonosov Moscow State University, Vorob'evy Gory, Moscow, 119899, Russia, izmod@ipmnet.ru/Fax: +7-095-9382048

New non-stationary self-consistent model of the solar wind interaction with two- component (atoms and plasma) interstellar medium is proposed. It is argued that primary and secondary interstellar atoms can be considered as quasi-stationary kinetic gas. Neutralized solar wind, atoms originated in the supersonic solar wind, is considered as zero-pressure fluid. We compare results of this simplified model with results of kinetic Baranov-Malama model. Identical results are produced by both models in the stationary case. The effects of 11-year solar cycle on the global structure of the heliospheric interface have been considered by Baranov and Zaitsev [1998] for fully ionized LISM. In this paper, we explore specific non-stationary effects introduced by the neutralized solar wind flux fluctuations.

This work has been supported by INTAS-CNES cooperation project # 97-00512 and International Space Science Institute in Bern.

References:    Baranov V. B. and Yu. G. Malama, JGR, 98, 15157, 1993;
                      Baranov, V. B. and N. A. Zaitsev, GRL, 25, 4051, 1998.