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We propose a new method to determine magnetic fields, by using themagnetic-field induced electric dipole transition $3p^43d\,^4\mathrm{D}_{7/2}$$\rightarrow$ $3p^5\, ^2\mathrm{P}_{3/2}$ in Fe$^{9+}$ ions. This ion has ahigh abundance in astrophysical plasma and is therefore well-suited for directmeasurements of even rather weak fields in e.g. solar flares. This transitionis induced by an external magnetic field and its rate is proportional to thesquare of the magnetic field strength. We present theoretical values for whatwe will label the reduced rate and propose that the critical energy differencebetween the upper level in this transition and the close to degenerate$3p^43d\, ^4\mathrm{D}_{5/2}$ should be measured experimentally since it isrequired to determine the relative intensity of this magnetic line fordifferent magnetic fields.

A Novel Method to Determine Magnetic Fields in low-density Plasma e.g.  Solar Flares Facilitated Through Accidental Degeneracy of Quantum States in  Fe$^{9+}$