ALMA and IRIS Observations of the Solar Chromosphere. I. An On-disk Type II Spicule

We present observations of the solar chromosphere obtained simultaneously with Atacama Large Millimeter/submillimeter Array (ALMA) and Interface Region Imaging Spectrograph (IRIS). The observatories targeted a chromospheric plage region which spatial distribution (split between strongly weakly magnetized regions) allowed study linear-like structures in isolation, free contamination from background emission. Using these conjunction radiative magnetohydrodynamic 2.5D model covering upper convection zone all way to corona that considers non-equilibrium ionization effects, we report detection an on-disk spicule ALMA confirm its multithermal nature.