Coronal Solar Magnetism Observatory

Coronal Solar Magnetism Observatory (COSMO) is a proposed observatory in Hawaii as part of the Mauna Loa Solar Observatory (MLSO), to track solar events. Instruments:

• LC ("Large Coronagraph") - on a dedicated 1.5-m telescope with a field of view of two solar radii.
• ChroMag ("Chromospheric and Prominence Magnetometer") - polarimeter on a dedicated 13-cm telescope with a FOV of 2.5 solar radii.
• K-Cor ("K-coronagraph") - polarimeter on dedicated 135-mm telescope.

Each is a polarimeter for studying the Sun's ever-changing magnetic field, each focused on its own set of frequencies matching specific spectral lines, for observing observe different layers of the solar atmosphere, and each with cadences designed for observing certain kinds of solar activity. As of 2024, K-Cor is completed and in operation at MLSO and ChroMag and LC are in development.