The results of experimental study of magnetic dipole (M1) transitions in highly charged ions of argon (Ar~(9+), Ar~(10+), Ar~(13+) and Ar~(14+)) and krypton (Kr~(18+) and Kr~(22+)) are presented. The forbidden transitions of the highly charged ions in the visible and near UV range of the photon emission spectra have been measured with accuracy better than 1 ppm. Our measurements for the "coronal lines" are the most accurate yet reported using an EBIT as a spectroscopic source of highly charged ions. These precise wavelength determinations provide a useful test and challenge for atomic structure calculations of many-electron systems.
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