First Flight of the EUV Snapshot Imaging Spectrograph (ESIS)

Abstract The Extreme-ultraviolet Snapshot Imaging Spectrograph (ESIS) launched on a sounding rocket from White Sands Missile Range 2019 September 30. ESIS is computed tomography imaging spectrograph (CTIS) designed to map emission line profiles across wide field of view, revealing the structure and dynamics small-scale transient events that are prevalent at transition region temperatures. In this paper, we review instrument, mission, data captured. We demonstrate how unique set can be interpreted qualitatively further present some initial quantitative inversions data. Using multiplicative algebraic reconstruction technique, combine information all four channels into single spatial–spectral cube every exposure. analyze two small explosive in O v 629.7 Å spectral with jets near ±100 km s −1 evolve 10 timescales vary significantly over spatial scales. Intriguingly, each these turns out bimodal (red+blue) jet outflows asymmetric unsynchronized. also qualitative analysis jetlike eruption captured by draw comparisons previously observed mini-filament eruptions. 5 minutes observing time, temporal evolution tens ∼11.′5 as well several larger extended eruptions, demonstrating advantage CTIS instruments traditional slit spectrographs capturing dynamic solar features large fields view.