Труды сотрудников ИВМ СО РАН

[Text] / T. Penz [et al.] ; ed.: O. Witasse // PLANETARY ATMOSPHERES, IONOSPHERES, AND MAGNETOSPHERES. Ser. ADVANCES IN SPACE RESEARCH : ELSEVIER SCIENCE LTD, 2005. - Vol. 36: 35th COSPAR Scientific Assembly (JUL 18-25, 2004, Paris, FRANCE), Is. 11. - P2049-2056, DOI 10.1016/j.asr.2004.11.039. - Cited References: 20 . - ISBN 0273-1177РУБ Engineering, Aerospace + Astronomy & Astrophysics + Geosciences, Multidisciplinary + Meteorology & Atmospheric Sciences

Аннотация: It is known from Pioneer Venus measurements that at the Venusian ionopause wave-like structures develop, which can detach in the form of ionospheric plasma clouds. This phenomenon is assumed to occur due to the Kelvin-Helmholtz instability, which can appear in large regions of the Venusian ionopause. Recent studies of Mars Global Surveyor measurements indicate that wave-like structures and plasma clouds also detach from the Martian ionopause. Therefore, these features seem to be common for the solar wind interaction of non-magnetized planets. We study the conditions at the Martian ionopause with respect to the occurrence of several MHD instabilities. The conditions in the magnetosheath are modeled by a semi-analytical MHD simulation that includes mass loading. The ionospheric parameter needed for the model calculations are taken from a global hybrid model. The stability of the Martian ionopause against the Kelvin-Helmholtz, the Rayleigh-Taylor, and the interchange instability is analyzed. Further, we suggest that including the Hall term in the description of the Kelvin-Helmholtz instability gives a current in the planetary boundary layer resulting in a shear flow compared with the ionospheric plasma, which can lead to an unstable boundary layer near the subsolar point. Since the interchange instability depends on the curvature of the magnetic field lines, we additionally study the influence of the strong curvature of the Martian ionopause due to the localized, remnant, crustal magnetism appearing mainly in the southern hemisphere of Mars. (c) 2004 COSPAR. Published by Elsevier Ltd. All rights reserved.


Доп.точки доступа:
Penz, T.; Arshukova, I.L.; Terada, N.; Shinagawa, H.; Erkaev, N.V.; Еркаев, Николай Васильевич; Biernat, H.K.; Lammer, H.; Witasse, O. \ed.\

/ K. L. Ivanov, V. M. Sadovsky, N. N. Lukzen // J Chem Phys. - 2015. - Vol. 143, Is. 8, DOI 10.1063/1.4928648 . - ISSN 0021-9606
Аннотация: In this work, we treat spin-selective recombination of a geminate radical pair (RP) in a spherical "microreactor," i.e., of a RP confined in a micelle, vesicle, or liposome. We consider the microreactor model proposed earlier, in which one of the radicals is located at the center of the micelle and the other one undergoes three-dimensional diffusion inside the micelle. In addition, we suggest a two-dimensional model, in which one of the radicals is located at the "pole" of the sphere, while the other one diffuses on the spherical surface. For this model, we have obtained a general analytical expression for the RP recombination yield in terms of the free Green function of two-dimensional diffusion motion. In turn, this Green function is expressed via the Legendre functions and thus takes account of diffusion over a restricted spherical surface and its curvature. The obtained expression allows one to calculate the RP recombination efficiency at an arbitrary magnetic field strength. We performed a comparison of the two models taking the same geometric parameters (i.e., the microreactor radius and the closest approach distance of the radicals), chemical reactivity, magnetic interactions in the RP and diffusion coefficient. Significant difference between the predictions of the two models is found, which is thus originating solely from the dimensionality effect: for different dimensionality of space, the statistics of diffusional contacts of radicals becomes different altering the reaction yield. We have calculated the magnetic field dependence of the RP reaction yield and chemically induced dynamic nuclear polarization of the reaction products at different sizes of the microreactor, exchange interaction, and spin relaxation rates. Interestingly, due to the intricate interplay of diffusional contacts of reactants and spin dynamics, the dependence of the reaction yield on the microreactor radius is non-monotonous. Our results are of importance for (i) interpreting experimental data for magnetic field effects on RP recombination in confined space and (ii) for describing kinetics of chemical reactions, which occur predominantly on the surfaces of biomembranes, i.e., lipid peroxidation reactions. © 2015 AIP Publishing LLC.

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Держатели документа:
International Tomography Center, Siberian Branch, Russian Academy of Sciences, Institutskaya St. 3a, Novosibirsk, Russian Federation
Novosibirsk State University, Pirogova St. 2, Novosibirsk, Russian Federation
Institute of Computational Modeling, Siberian Branch, Russian Academy of Sciences, Akademgorodok 50/44, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Sadovsky, V.M.; Садовский, Владимир Михайлович; Lukzen, N. N.

/ V. A. Kochnev // International Multidisciplinary Scientific GeoConference Surveying Geology and Mining Ecology Management, SGEM : International Multidisciplinary Scientific Geoconference, 2017. - Vol. 17: 17th International Multidisciplinary Scientific Geoconference, SGEM 2017 (29 June 2017 through 5 July 2017, ) Conference code: 130800, Is. 62. - P899-906, DOI 10.5593/sgem2017/62/S28.115 . -
Аннотация: It is known that the movement of the liquid core creates electric currents, inducing a main magnetic field of the planet. The liquid core of the high temperature becomes ionized plasma (plasma), which It is quasi-neutral (not neutral) - by definition. One of the major geodynamo questions: what is the source of strength, causing fluid movement in the core of the planet? Many authors have investigated geodynamo: planetary rotation around its axis, the temperature difference and pressure as well as the Coriolis force. Moffatt (1980), at the end of his book, as expressed the problem mentioned above “… For example, it is not yet known that the ultimate source energy is the basic movements of the Earth’s disk Dynamo”. In this study, the role of the driving forces of the liquid core considered tidal forces created axial rotation of the planet and the influence of external objects (the Sun and planets, satellites). The value of the tidal force on the equator of the planet depends on the radius and the period of the axial rotation of the planet, mass, radius and the orbital period of the satellite around the planet. The paper presents the formula and the results of the calculation of tidal forces and forecast the relative values equatorial magnetic fields of the planets all the planets of the solar system. The interpretation of the results illustrated with drawings. The new version of the dynamo It helps to explain the reasons high intensity magnetic Jupiter's field compared to Saturn’s fields, Uranus and Neptune, and much more Earth field intensity compared with fields of Venus, Mercury and Mars. The calculations of the correlation values the magnetic field at the equator: on the model according to the forecast and observations on the planets. Correlation coefficient is 0.997, that indicates a close relationship observed and estimates fields, and this is indirect evidence of the correctness of the adopted model. © SGEM2017 All Rights Reserved.

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Держатели документа:
Institute of Computational Modelling of the Siberian Branch of the Russian Academy of Sciences, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Kochnev, V. A.