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We present new measurements of the millimeter wavelength continuum emissionfrom the long period variable Mira ($o$ Ceti) at frequencies of 46 GHz, 96 GHz,and 229 GHz ($\lambda$~7 mm, 3 mm, and 1 mm) based on observations obtainedwith the Jansky Very Large Array (JVLA) and the Atacama LargeMillimeter/submillimeter Array (ALMA). The measured millimeter flux densitiesare consistent with a radio photosphere model derived from previousobservations, where flux density, $S_{\nu}\propto\nu^{1.86}$. The stellar diskis resolved, and the measurements indicate a decrease in the size of the radiophotosphere at higher frequencies, as expected if the opacity decreases atshorter wavelengths. The shape of the radio photosphere is found to be slightlyelongated, with a flattening of ~10-20%. The data also reveal evidence forbrightness non-uniformities on the surface of Mira at radio wavelengths. Mira'shot companion, Mira B was detected at all three observed wavelengths, and wemeasure a radius for its radio-emitting surface of $\approx2.0\times10^{13}$cm. The data presented here highlight the power of the JVLA and ALMA for thestudy of the atmospheres of evolved stars.

New Measurements of the Radio Photosphere of Mira based on Data from the JVLA and ALMA