Speaker
Description
Sunrise III/SUSI conducted observations at the 409 nm spectral window, capturing an exceptional scan from near the disk up to 7 Mm above it. Ground-based acquisition of such data is hindered by foreshortening, low contrast, and variable atmospheric conditions. Over one hundred spectral transitions were detected, including Hydrogen (H$\delta$), Sr II, rare-earth elements such as La, Dy, and Hf, and molecular transitions of CH and CN. Weak lines of rare-earth elements and blends, typically undetectable on the disk, are now observable off-limb. These observations also reveal that the spicule forest appears in spectral lines that normally probe photospheric heights at the disk centre, as well as the small-scale structure of the surface-parallel chromospheric velocity field.