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[en] We propose a new method to determine magnetic fields, by using the magnetic-field-induced electric dipole transition in ions. This ion has a high abundance in astrophysical plasma and is therefore well suited for direct measurements of even rather weak fields in, e.g., solar flares. This transition is induced by an external magnetic field and its rate is proportional to the square of the magnetic field strength. We present theoretical values for what we will label the reduced rate and propose that the critical energy difference between the upper level in this transition and the close-to-degenerate should be measured experimentally since it is required to determine the relative intensity of this magnetic line for different magnetic fields.