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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 Sun luminosity and "solar dynamo - geodynamo" connection, where an energy ofsolar axions emitted in M1 transition in 57Fe nuclei is modulated at first bythe magnetic field of the solar tachocline zone (due to the inverse coherentPrimakoff effect) and after that is resonance absorbed in the core of theEarth, thereby playing the role of an energy source and a modulator of theEarth magnetic field. Within the framework of this mechanism estimations of thestrength of an axion coupling to a photon (ga_gamma about 1.64*10^-9 GeV^-1),the axion-nucleon coupling (ga_gamma_eff about 10^-5) and the axion mass (maabout 30 eV) have been obtained.

Axion mechanism of the Sun luminosity and solar dynamo - geodynamo connection