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We present the results of detailed monitoring of the radio emission from theType Ic supernova SN 1994I from 3 days after optical discovery on 1994 March 31until eight years later at age 2927 days on 2002 April 05. The data were mainlyobtained using the Very Large Array at the five wavelengths, 1.3, 2.0, 3.6,6.2, and 21 cm, and from the Cambridge 5 km Ryle Telescope at 2.0 cm. Twoadditional measurements were obtained at millimeter wavelengths. This data setrepresents the most complete, multifrequency radio observations ever obtainedfor a Type Ib/c supernova. The radio emission evolves regularly in both timeand frequency and is well described by established SN emission/absorptionmodels. It is the first radio supernova with sufficient data to show that it isclearly dominated by the effects of synchrotron self-absorption at early times.

Radio Emission from SN 1994I in NGC 5194 (M 51) - The Best Studied Type Ib/c Radio Supernova