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Сообщение о землетрясении
Если Вы ощутили землетрясение, пожалуйста, сообщите о нёмTwo-Mode Hereditary Model of Solar Dynamo
- Federal State Budget Research Institution Institute of Cosmophysical Research and Radio Wave Propagation, Far Eastern Branch of the Russian Academy of Sciences
Abstract: The magnetic field of the Sun is formed by the mechanism of hydromagnetic
dynamo. In this mechanism, the flow of the conducting medium (plasma) of the convective
zone generates a magnetic field, and this field corrects the flow using the Lorentz force,
creating feedback. An important role in dynamo is played by memory (hereditary), when a
change in the current state of a physical system depends on its states in the past. Taking
these effects into account may provide a more accurate description of the generation of
the Sun’s magnetic field. This paper generalizes classical dynamo models by including
hereditary feedback effects. The feedback parameters such as the presence or absence of
delay, delay duration, and memory duration are additional degrees of freedom. This can
provide more diverse dynamic modes compared to classical memoryless models. The
proposed model is based on the kinematic dynamo problem, where the large-scale velocity
field is predetermined. The field in the model is represented as a linear combination of two
stationary predetermined modes with time-dependent amplitudes. For these amplitudes,
equations are obtained based on the kinematic dynamo equations. The model includes two
generators of a large-scale magnetic field. In the first, the field is generated due to large-
scale flow of the medium. The second generator has a turbulent nature; in it, generation
occurs due to the nonlinear interaction of small-scale pulsations of the magnetic field
and velocity. Memory in the system under study is implemented in the form of feedback
distributed over all past states of the system. The feedback is represented by an integral
term of the type of convolution of a quadratic form of phase variables with a kernel of a
fairly general form. The quadratic form models the influence of the Lorentz force. This
integral term describes the turbulent generator quenching. Mathematically, this model is
written with a system of integro-differential equations for amplitudes of modes. The model
was applied to a real space object, namely, the solar dynamo. The model representation of
the Sun’s velocity field was constructed based on helioseismological data. Free field decay
modes were chosen as components of the magnetic field. The work considered cases when
hereditary feedback with the system arose instantly or with a delay. The simulation results
showed that the model under study reproduces dynamic modes characteristic of the solar
dynamo, if there is a delay in the feedback.
Kazakov E., Vodinchar G., Tverdyi D. Two-Mode Hereditary Model of Solar Dynamo. Mathematics. 2025. Vol.13, №10. DOI: 10.3390/math13101669
