ALMA Discovery of Solar Umbral Brightness Enhancement at λ = 3 mm

Kazumasa Iwai, Nagoya University, Nagoya, Japan, Maria Loukitcheva, New Jersey Institute of Technology, Edison, NJ, United States, Masumi Shimojo, NAOJ, Mitaka, Tokyo, Japan, Sami K. Solanki, Max Planck Institute for Solar System Research, Katlenburg-Lindau, Germany and Stephen White, AFRL, Kirtland AFB, NM, United States