Electron Losses and Fields Investigation (ELFIN) is a nanosatellite in development at University of California, Los Angeles (UCLA). ELFIN is a 3U CubeSat designed to study space weather, specifically, the loss of relativistic electrons in the radiation belts. ELFIN is currently a participant in the Air Force Research Lab's University Nanosatellite Program and is funded by NASA's Low Cost Access to Space program and the National Science Foundation.
ELFIN carries a fluxgate magnetometer as well as two energetic particle detectors: one for ions and one for electrons. The principal investigator of the project is Vassilis Angelopoulos.
ELFIN applied to and was accepted by NASA's ELaNa in February 2014.
ELFIN-L is a collaboration mission between UCLA and Moscow State University. The Institute of Geophysics and Planetary Physics (IGPP) at UCLA delivered the ELFIN instruments for the Lomonosov Russian University Satellite. The satellite is currently awaiting launch.