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For all involved in astronomy, the importance of monitoring and determiningastrophysical magnetic field strengths is clear. It is also a well-known factthat the corona magnetic fields play an important part in the origin of solarflares and the variations of space weather. However, after many years of solarcorona studies, there is still no direct and continuous way to measure andmonitor the solar magnetic field strength. We will here present a scheme whichallows such a measurement, based on a careful study of an exotic class ofatomic transitions known as magnetic induced transitions in Fe$^{9+}$. In thiscontribution we present a first application of this methodology and determine avalue of the coronal field strength using the spectroscopic data from HINODE.

A first spectroscopic measurement of the magnetic field strength for an active region of the solar corona