@misc{Millan_Woodger_McCarthy_Sample_Smith_Rexroad_2021, title={BARREL 3D Ephemeris (EPHM) Geographic and Magnetic Coordinates, Level 2, 4 s Data}, url={https://hpde.io/NASA/NumericalData/BARREL/3D/Ephemeris/L2/PT4S.html}, DOI={10.48322/M49N-7F05}, abstractNote={Geographic and Magnetic Coordinates: The ephemeris data products, which include the balloon epoch time, latitude, longitude, and altitude, are each returned from the payload once every 4s. Geographic coordinates are obtained from an onboard Global Positioning System, GPS, unit. Magnetic coordinates are derived by using the International Radiation Belt Environment Modeling, IRBEM, FORTRAN library.}, publisher={NASA Space Physics Data Facility}, author={Millan, Robyn and Woodger, Leslie and McCarthy, Michael and Sample, John and Smith, David and Rexroad, Warren}, year={2021}, language={en} }