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Solar cycle influence on the interaction of the solar wind with Local Interstellar Cloud

Izmodenov, V.I., Malama, Y. and Ruderman, M.S. (2005) Solar cycle influence on the interaction of the solar wind with Local Interstellar Cloud. Astronomy and Astrophysics, 429 (3). pp. 1069-1080. ISSN 1432-0746

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Abstract

We present results of a new time-dependent kinetic model of the H atom penetration through the solar wind - interstellar medium interaction region. A kinetic 6D (time, two dimensions in space, and three dimensions in velocity-space) equation for interstellar H atoms was solved self-consistently with time-dependent Euler equations for the solar wind and interstellar charged components. We study the response of the interaction region to 11-year solar cycle variations of the solar wind dynamic pressure. It is shown that the termination shock location varies within ±7 AU, the heliopause variation is ~4 AU, and the bow shock variation is negligible. At large heliocentric distances, the solar cycle induces 10-12% fluctuations in the number density of both primary and secondary interstellar H atoms and atoms created in the inner heliosheath. We underline the kinetic behavior of the fluctuations of the H atom populations. Closer to the Sun the fluctuations increase up to 30-35% at 5 AU due to solar cycle variation of the charge exchange rate. Solar cycle variations of interstellar H atoms in the heliospheric interface and within the heliosphere may have major importance for the interpretation of H atom observations inside the heliosphere.

Item Type: Article
Copyright, Publisher and Additional Information: © ESO 2005. Reproduced with permission.
Keywords: Sun, solar wind, interplanetary medium, ISM, atoms, activity, hydrodynamics
Institution: The University of Sheffield
Academic Units: The University of Sheffield > Faculty of Science (Sheffield) > School of Mathematics and Statistics (Sheffield)
Depositing User: Repository Officer
Date Deposited: 16 Nov 2006
Last Modified: 09 Jun 2014 16:34
Published Version: http://dx.doi.org/10.1051/0004-6361:20041348
Status: Published
Publisher: EDP Sciences
Refereed: Yes
Identification Number: 10.1051/0004-6361:20041348
URI: http://eprints.whiterose.ac.uk/id/eprint/1717

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