Database of Density and Temperature Moments Derived from MMS-1 HPCA

This is a database of density and temperature moments derived from Magnetospheric Multiscale (MMS-1) Hot Plasma Analyzer (HPCA) ion phase space density distributions.   Proton velocity components $(V_X, V_Y, V_Z)$ were also computed in the geocentric solar magnetospheric (GSM) coordinate system, and changed to the plasma frame of reference by subtraction of the MMS-1 spacecraft velocity. The database of 39,018 MMS-1 data points spans 11 October 2016 to 29 December 2021 (5.2 years, discontinuous coverage).  The event selection criteria yielded spatial coverage spanning $R=5$--$15\,R_E$ and 08--21~MLT.  Moments were numerically computed for three species: H+, He+, and O+.  Numerical integration included energies $\le$100~eV, by including the lowest 27 HPCA energy steps ($1.4$~eV to 98.4~eV). To correct for spacecraft charging effects, moments were computed using ion distributions that are shifted in energy by the point-to-point spacecraft potential.  The HPCA cadence is $\sim$$10$~s for most (85.1\%) of the database, except for selection-related time gaps: [7.6\%, 2.6\%, 4.7\%] of points have a data gap equal to [1, 2, 3 or more] HPCA timesteps.  The event selection for the database was provided by M. J. Kim.  The computation of the moments was performed by J. Mukherjee using software and analysis tools with contributions by C. A. Gonzalez and R. Gomez.