RUSSIAN JOURNAL OF EARTH SCIENCES, VOL. 15, ES4001, doi:10.2205/2015ES000558, 2015

# Inverse problem in Parker's dynamo

*M. Yu. Reshetnyak*

### Abstract

The inverse solution of the 1D Parker dynamo equations is considered. The method is based on minimization of the cost-function, which characterize deviation of the model solution properties from the desired ones. The output is the latitude distribution of the magnetic field generation sources: the $\alpha$- and $\omega$-effects. Minimization is made using the Monte-Carlo method. The details of the method, as well as some applications, which can be interesting for the broad dynamo community, are considered: conditions when the invisible for the observer at the surface of the planet toroidal part of the magnetic field is much larger than the poloidal counterpart. It is shown that at some particular distributions of $\alpha$ and $\omega$ the well-known thesis that sign of the dynamo-number defines equatorial symmetry of the magnetic field to the equator plane, is violated. It is also demonstrated in what circumstances magnetic field in the both hemispheres have different properties, and simple physical explanation of this phenomenon is proposed.

*Received 15 November 2015; accepted 17 November 2015; published 19 November 2015.*

**Citation:** Reshetnyak M. Yu. (2015), Inverse problem in Parker's dynamo, *Russ. J. Earth Sci., 15*, ES4001, doi:10.2205/2015ES000558.

Copyright 2015 by the Geophysical Center RAS.

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