SAMPEX

SAMPEX (for Solar Anomalous and Magnetospheric Particle Explorer) was a NASA Small Explorer Program (SMEX) satellite to study anomalous cosmic rays (ACRs), solar energetic particles (SEPs), and Earth's magnetosphere. It was the first SMEX mission (thus SMEX-1), launched into low Earth orbit in 1992. NASA operated it until 2004, after which it was operated by interested parties until its 2012 reentry. Instruments:

• LICA "Low-energy Ion Composition Analyzer".
• HILT "Heavy Ion Large Telescope".
• MAST "Mass Spectrometer Telescope".
• PET "Proton-Electron Telescope".

All these detected various ions and other charged particles, of interest regarding Earth's magnetosphere and space weather.