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Observations of the Sun at millimeter and submillimeter wavelengths offer aunique probe into the structure, dynamics, and heating of the chromosphere; thestructure of sunspots; the formation and eruption of prominences and filaments;and energetic phenomena such as jets and flares. High-resolution observationsof the Sun at millimeter and submillimeter wavelengths are challenging due tothe intense, extended, low- contrast, and dynamic nature of emission from thequiet Sun, and the extremely intense and variable nature of emissionsassociated with energetic phenomena. The Atacama Large Millimeter/submillimeterArray (ALMA) was designed with solar observations in mind. The requirements forsolar observations are significantly different from observations of siderealsources and special measures are necessary to successfully carry out this typeof observations. We describe the commissioning efforts that enable the use oftwo frequency bands, the 3 mm band (Band 3) and the 1.25 mm band (Band 6), forcontinuum interferometric-imaging observations of the Sun with ALMA. Examplesof high-resolution synthesized images obtained using the newly commissionedmodes during the solar commissioning campaign held in December 2015 arepresented. Although only 30 of the eventual 66 ALMA antennas were used for thecampaign, the solar images synthesized from the ALMA commissioning data revealnew features of the solar atmosphere that demonstrate the potential power ofALMA solar observations. The ongoing expansion of ALMA and solar-commissioningefforts will continue to enable new and unique solar observing capabilities.

Observing the Sun with Atacama Large Millimeter/submillimeter Array (ALMA): High Resolution Interferometric Imaging