@misc{Fuselier_Young_Gomez_Burch_2022, title={MMS 4 Hot Plasma Composition Analyzer (HPCA) Ions, Level 2 (L2), Survey Mode, 0.625 s Data}, url={https://hpde.io/NASA/NumericalData/MMS/4/HotPlasmaCompositionAnalyzer/Survey/Level2/Ion/PT0.625S.html}, DOI={10.48322/6EWA-9074}, abstractNote={Hot Plasma Composition Analyzer (HPCA) Ions, Level 2, Survey, 0.625 s Data. The MMS HPCA instruments measure the energy and composition of magnetospheric plasmas in the energy range from 1 eV to 40 keV. An electrostatic energy analyzer (ESA) that is optically coupled to a carbon-foil based Time-of-Flight (TOF) section comprises each HPCA. The basic HPCA data product is an array of counts for 5 ion species, at 63 energies, for each of 16 elevation anodes. Sixteen basic products, also called azimuths, are acquired every 0.625 s; half a spacecraft spin period nominally has 16 azimuths. The five ion species are protons (H+), alpha particles (He++), helium ions (He+), singly charged Oxygen (O+), and background counts.}, publisher={NASA Space Physics Data Facility}, author={Fuselier, Stephen A. and Young, David T. and Gomez, Roman G. and Burch, James L.}, year={2022}, language={en} }