  We have searched for axions which could be produced in the solar core by
exploiting their conversion to X rays in a strong laboratory magnetic field.
The signature of the solar axion is an increase in the rate of the X rays
detected in a magnetic helioscope when the sun is within its acceptance.
  From the absence of such a signal we set a 95% confidence level limit on the
axion coupling to two photons $g_{a\gamma\gamma}\equiv 1/M < 6.0\times
10^{-10}$ GeV$^{-1}$, provided the axion mass $m_a<0.03$ eV. The limit on the
coupling is factor 4.5 more stringent than the recent experimental result. This
is the first experiment whose sensitivity to $g_{a\gamma\gamma}$ is higher than
the limit constrained by the solar age consideration.
