New mechanism producing axions in the AQN model and how the CAST can
  discover them
  We advocate the idea that there is a fundamentally new mechanism for the
axion production in the Sun, which has never been discussed previously in the
literature. This novel mechanism of the axion production is based on the
so-called Axion Quark Nugget (AQN) Dark Matter Model. These axions will be
produced in addition to well studied axions emitted due to the Primakoff
effect. The AQN model was originally invented as a natural explanation of the
observed ratio $\Omega_{\rm dark} \sim \Omega_{\rm visible}$ when the DM and
visible matter densities assume the same order of magnitude values,
irrespectively to the axion mass $m_a$ or initial misalignment angle
$\theta_0$. This model, without adjustment of any parameters, reproduces
reasonably the intensity of the extreme UV (EUV) radiation from the solar
corona as a result of the AQN annihilation events with the solar material. This
extra energy released in corona represents a resolution, within AQN framework,
a long standing puzzle known in the literature as the "solar corona heating
mystery". The same annihilation events also produce the relativistic axions.
This represents a new mechanism of the axion production, and constitutes the
main subject of this work. The flux of these axions is unambiguously fixed in
this model and expressed in terms of the EUV luminosity from corona. We also
compute the spectral properties of these axions and make few comments on the
potentials for the discovery of these solar axions by the upgraded CAST (CERN
Axion Solar Axion) experiment.
