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We show existence of strong negative correlation between the temporalvariations of magnetic field toroidal component of the solar tachocline (thebottom of convective zone) and the Earth magnetic field (Y-component). Thepossibility that hypothetical solar axions, which can transform into photons inexternal electric or magnetic fields (the inverse Primakoff effect), can be theinstrument by which the magnetic field of convective zone of the Sun modulatesthe magnetic field of the Earth is considered. We propose the axion mechanismof "solar dynamo-geodynamo" connection, where an energy of axions, which formin the Sun core, is modulated at first by the magnetic field of the solartachocline zone (due to the inverse coherent Primakoff effect) and after thatis absorbed in the liquid core of the Earth under influence of the terrestrialmagnetic field, thereby playing the role of an energy source and a modulator ofthe Earth magnetic field. Within the framework of this mechanism newestimations of the strength of an axion coupling to a photon (ga_gamma about5*10^-9 GeV^-1) and the axion mass (ma ~ 30 eV) have been obtained.

Solar axions as an energy source and modulator of the Earth magnetic field