A strong effort has been necessary to protect the antennas from the heat, but in the end they succeeded: ALMA started the observations of the Sun.
The lesson has been learned in the hard way: the Swedish–ESO Submillimetre Telescope (SEST) had a fire in its secondary mirror assembly after the telescope was accidentally pointed at the Sun.
However, this time things went very well, and this week have been released by the ESO a series of images that show the power of this new ALMA capability.
Scientists focused their attention into a well known sunspot, which was observed at 1.25 and 3 millimetres.
These observations probed different layer of the chromosphere, and opened a new frontier in the study of our precious star. For further details you can read the official press release of the ESO where other interesting images are available.