Fredagskollokvium: Dan Henrik Sekse: On-disc counterparts of type II spicules: Simultaneous observations of RBEs in the Ca II 854.2 nm and Hα lines

Recently, spicules were found to exist in two different types. A new class of so-called type II spicules was discovered at the solar limb with the Solar Optical Telescope onboard the Hinode spacecraft. These type II spicules have also been linked with on-disc observations of Rapid Blue-shifted Excursions (RBEs) in the Hα and Ca II 854.2 nm lines. Here we analyse observations with the CRisp Imaging SpectroPolarimeter (CRISP) at the Swedish Solar Telescope (SST) on La Palma. The observational program was optimised for detection of RBEs in both the Hα and Ca II 854.2 nm lines at high temporal cadence. In this study we analyse a number of high-quality time sequences of different targets and expand on the RBE statistics presented in Rouppe van der Voort et al. 2009. Furthermore, we focus on the temporal evolution of RBEs and the differences between the Hα and Ca II 854.2 nm observations.