CASSIOPE
SEI
Magnetic Field/Electric Field Instruments
ESA Data Ontology
The SEI (Suprathermal Electron Imager) SEI measures the 2-D energy and angular distributions of thermal electrons and soft electrons in the range 1-200 eV/q with particular emphasis on photoelectrons in the 1 to 50 eV range, which are believed to play an important role in the polar wind outflow.