Sub-Second Hard X-ray Imaging with Solar Orbiter/STIX: Existence of Short Lived Nonthermal Sources in the Flare Ribbons of the 28-Oct-2021 Event of X1 GOES Class

Andrea Francesco Battaglia1, Hannah Collier1, Paolo Massa2, Anna Volpara3 and Sam Krucker1,4, (1)FHNW, Windisch, Switzerland, (2)WKU, Bowling Green, United States, (3)UniGE, Genova, Italy, (4)UC Berkeley, Space Science Lab, Berkeley, United States