ALMA and IRIS Observations of the Solar Chromosphere. I. An On-disk Type II Spicule
Martínez-Sykora, Juan; De Pontieu, Bart; Chintzoglou, Georgios; Hansteen, Viggo; Wedemeyer, Sven; Sainz Dalda, Alberto; de la Cruz Rodríguez, Jaime; Szydlarski, Mikolaj; Jafarzadeh, Shahin; Bastian, Timothy S.
United States, Norway, Sweden
Abstract
We present observations of the solar chromosphere obtained simultaneously with the Atacama Large Millimeter/submillimeter Array (ALMA) and the Interface Region Imaging Spectrograph. The observatories targeted a chromospheric plage region of which the spatial distribution (split between strongly and weakly magnetized regions) allowed the study of linear-like structures in isolation, free of contamination from background emission. Using these observations in conjunction with a radiative magnetohydrodynamic 2.5D model covering the upper convection zone all the way to the corona that considers nonequilibrium ionization effects, we report the detection of an on-disk chromospheric spicule with ALMA and confirm its multithermal nature.