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Boosting the Magnetic Field of a Toroidal Conductive Fluid by a Poloidal Flow

##article.authors##

  • Otsuki, Mamoru Independent

DOI:

https://doi.org/10.51094/jxiv.284

キーワード:

Poloidal flow、 dynamo theory、 inductance、 Lenz’s law、 magnetohydrodynamics

抄録

Researchers have struggled to understand the mechanism underlying the formation of celestial magnetic fields. Currently, the generation of axisymmetric and poloidal magnetic fields can be solved by complex convection arguments. There are also simple convection claims, but they all assert that magnetic field generation is by simple convection by treating it as an approximation or nonlinear process. This paper addresses a truly simple axisymmetric poloidal convection and magnetic field. To calculate the electrical components, this paper introduces a theory that separates the vector potential into inductance and current in a relational formula. The reason is to consider the mutual influence between distant circuits in terms of mutual inductance. Then, the change in current is calculated from the change in inductance. It is solved as an eigenvalue problem. By this method, it is proven that a simple axisymmetric poloidal magnetic field can be generated from axisymmetric poloidal convection. Another reason is the nature of mutual inductance and Lenz’s law, which reflects the effect of current changes on other electrical circuits. This is intended to eliminate the concern that magnetic field growth will be impaired by magnetic field freezing. These are novel concepts, and we believe that these findings will contribute to further elucidating the formation mechanism of celestial magnetic fields and plasma reactor research. However, regarding the stability of the magnetic field, the behavior of convection itself must be considered, but since this topic is not included in this paper, only the concept is described.

利益相反に関する開示

The author has no conflicts of interest to declare. No funding was obtained for this work.

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引用文献

E. H. Levy. Generation of planetary magnetic fields. Annu. Rev. Earth Planet. Sci., vol. 4 (1976), p. 159–185.

E. N. Parker. Hydromagnetic dynamo models. Astrophysical J., vol. 122 (1955), p. 293–314.

T. G. Cowling. The magnetic field of sunspots. Monthly Notices Roy. Astronomical Soc., vol. 94(1) (1933), p. 39–48.

Y. Masada and T. Sano. Mean-field modeling of an α2 dynamo coupled with direct numerical simulations of rigidly rotating convection. The Astrophysical Journal Letters, vol. 794(1) (2014), p. L6.

Sheremetyeva, Olga V. and Godomskaya, Anna N. The modes of magnetic field generation in a low-mode model of αω-dynamo with α-generator varying intensity regulated by a function with an alternating kernel. EPJ Web Conf., vol. 254 (2021), p. 02015.

F. K. M. STEENBECK and K.-H. RÄDLER. Berechnung der mittleren lorentzfeldstärke b × B für ein elektrisch leitendes medium in turbulenter, durch corioliskräfte beeinflußter bewegung. Institut für Magnetohydrodynamik Jena der Deutschen Akademie der Wissenschaften zu Berlin, vol. 21 a (1966), pp. 369–376.

D. G. J. J. Love. Dynamos driven by poloidal flow exist. Geophys. Res. Lett., vol. 23(8) (1996), p. 857–860.

P. C. Matthews. Dynamo action in simple convective flows. Mathematical, Physical and Engineering Sciences, vol. 455 (1985), p. 1829–1840.

P. Cardin and L. Cugliandolo. Dynamos: Lecture Notes of the Les Houches Summer School 2007, vol. 88 of Les Houches (Elsevier Science, 2011).

H. S. Reall. Mathematical tripos part IB: Electromagnetism (2022).

H. Alfvén. On the Existence of Electromagnetic-Hydrodynamic Waves. Arkiv for Matematik, Astronomi och Fysik, vol. 29B (1943), pp. 1–7.

Y. Zeldovich. The magnetic field in the two-dimensional motion of a conducting turbulent fluid. Sov. Phys. JETP., vol. 4 (1957), p. 460–462.

G. H. Bullard E.C. Homogeneous dynamos and terrestrial magnetism. Phil. Trans. R. Soc. Lond. A, vol. 247 (1954), pp. 213–278.

H.K.Moffatt. Magnetic Field Generation in Electrically Conducting Fluids. Cambridge Monographs on Mechanics (Cambridge University Press, 1978).

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投稿日時: 2023-02-13 11:54:06 UTC

公開日時: 2023-02-14 11:13:06 UTC — 2024-04-25 09:15:50 UTCに更新

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研究分野
物理学