Project Grant 2310122

This $190,077 Project Grant was awarded by the National Science Foundation (NSF) Directorate for Mathematical and Physical Sciences under the Mathematical and Physical Sciences program (CFDA 47.049). The grant will support expanding the currently operating Radio Neutrino Observatory in Greenland (RNO-G) to enable observations of ultra-high-energy neutrinos. Specifically, the two-year program will continue building the RNO-G array beyond the seven stations currently installed and operating in Greenland. Key activities include improving the drill reliability and efficiency to more rapidly install stations, constructing and installing instrumentation, commissioning the stations, studying radio wave propagation in ice, and operating the RNO-G stations in science data-taking mode to assess the instrument's performance. The goal is to leverage the large footprint of the full RNO-G array to achieve unprecedented sensitivity and be the first ultra-high energy neutrino observatory with a view of the northern sky. This research addresses NSF's priority areas under its Windows on the Universe Big Idea, advancing multi-messenger astrophysics to further understand the most powerful cosmic ray accelerators and explosive events in the universe.