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Dyadechkin, S.
Semenov, V. S.
Kallio, E.
Еркаев, Николай Васильевич
Alho, M.
Lammer, H.
2018-02-07T07:29:08Z
2018-02-07T07:29:08Z
2017-08
Dyadechkin, S. Global kinetic hybrid simulation for radially expanding solar wind [Текст] / S. Dyadechkin, V. S. Semenov, E. Kallio, Николай Васильевич Еркаев, M. Alho, H. Lammer // Journal of Geophysical Research. — 2017. — Т. 122.
01480227
http://onlinelibrary.wiley.com/doi/10.1002/2017JA023992/epdf
http://elib.sfu-kras.ru/handle/2311/69865
We present the results of a 1-D global kinetic simulation of the solar wind in spherical coordinates without a magnetic field in the region from the Sun to the Earth’s orbit. Protons are considered as particles while electrons are considered as a massless fluid, with a constant temperature, in order to study the relation between the hybrid and hydrodynamic solutions. It is shown that the strong electric field in the hybrid model accelerates the protons. Since the electric field in the model is related to electron pressure, each proton in the initial Maxwellian velocity distribution function moves under the same forces as in the classical Parker Solar wind model. The study shows that the hybrid model results in very similar velocity and number density distributions along the radial distance as in the Parker model. In the hybrid simulations, the proton temperature is decreased with distance in 1 order of magnitude. The effective polytropic index of the proton population slightly exceeds 1 at larger distances with the maximum value ∼1.15 in the region near the Sun. A highly non-Maxwellian type of distribution function is initially formed. Further from the Sun, a narrow beam of the escaping protons is created which does not change much in later expansion. The results of our study indicates that already a nonmagnetized global hybrid model is capable of reproducing some fundamental features of the expanding solar wind shown in the Parker model and additional kinetic effects in the solar wind.
solar wind
hybrid kinetic simulation
Global kinetic hybrid simulation for radially expanding solar wind
Journal Article
Journal Article Preprint
41.23.21
2018-02-07T07:29:08Z
10.1002/2017JA023992
Политехнический институт
Кафедра прикладной механики
Journal of Geophysical Research
Q1
Q1


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