to Ramaty's theorisation on the origin of low energy cosmic rays. The theory is now generally accepted within the physics community. Another notable field of study which Ramaty engaged in was the field of gamma-ray line astronomy, where he published seminal works regarding positron annihilation radiation and studies into nucleosynthetic decay and nuclear deexcitation lines. More of this work, with detailed analysis and presentations of his findings, can be found in an article which was co-authored by Ramaty called "Gamma Ray Lines: A New Window to the Universe". The study of positron annihilation radiation and nucleosynthetic decay is used in order to understand band structure and Fermi surfaces in metals. Ramaty's observations of low-energy cosmic rays follow the findings of R. M. Hjellming in order to build upon our understanding of their origins and how they are able to be observed and imaged with the RHESSI mission and observatories across the world. Ramaty's findings have contributed greatly to the literature in this field of science and the work currently being done credits his papers as crucial research. Richard E. Lingenfelter says, "The most notable of those studies was their prediction of interstellar gamma-ray emission in the 1.809-MeV line from the decay of supernova-produced aluminium-26, which was subsequently found with instruments on HEAO-C in 1982 to be the most intense nucleosynthetic line in the Galaxy." Ramaty's work has been recognised by NASA through his continual efforts and dedication to the field and has honoured him with the renaming of the HESSI mission to RHESSI making it the first NASA mission to be named after a researcher. Ramaty was a crucial part of starting the initiative, and his colleagues note that without his presence, the mission would have never been founded or put into action. RHESSI is the sixth Small Explorer mission from NASA and was launched on February 5 in 2005. [1] NASA's Goddard Space Flight Center Laboratory for Astronomy & Solar Physics review from July 2001 to June 2002 has also mentioned Ramaty's work and states: "Reuven Ramaty, a GSFC astrophysicist who died in March 2001. Ramaty had a long and distinguished career in the Laboratory for High Energy Astrophysics developing much of the theoretical framework for solar gamma-ray line spectroscopy. He was a founding member of the original HESSI team, and his active involvement and enthusiastic support were critical to the realisation of HESSI and to its selection by