cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.48322/d9ra-na69
title: Juno Ephemeris, Heliocentric Trajectories, Heliographic, Heliographic Inertial, and Solar Ecliptic Coordinates, HelioWeb, Daily Data

description: Heliocentric trajectories for Juno in Heliographic, HG, Heliographic Inertial, HGI, and Solar Ecliptic, SE, Coordinates The original trajectory data are taken from http://ssd.jpl.nasa.gov/horizons.cgi where users can find many more objects. In the case of orbit data for planets, the orbit data can be used as a proxy for spacecraft ephemeris that are in orbit about the planets. On a heliospheric scale, differences between the planet orbital tarjectory and that of the spacecraft are very small. For instance, the heliocentric longitudes differ by only 0.25° for a spacecraft stationed near the L1 Lagrange point at approximately 100 Earth radii upstream of the Earth. The production of the HG, HGI, and SE trajectory data requires a values for the "Equinox Epoch", which is defined as the epoch time when the direction from the Earth to the sun at the time of the vernal equinox when the sun seems to cross equatorial plane of the Earth from below. This direction is called the First Point of Aries, FPA and it is not a fixed direction but drifts by about 1.4° per century or 50.26" per year. In addition, there are tiny irregularities in FPA drift that are on the order of 1" per year or less. The Equinox Epoch can be determined by using a variety of methods for calculating the instantaneous FPA longitudinal direction and whether the tiny irregularities have been smoothed or averaged out. Four methods for determining the Equinox Epoch are in common usage: +---------------------------------------------------------------------+   Method Name   FPA Longitude Definition    ---------------------------------------------------------------------    B1950.0   the actual FPA at 22:09 UT on December 31, 1949     J2000.0   the smoothed FPA at 12:00 UT on January 1, 2000     True of Date   the actual FPA at 00:00 UT on the date of interest     Mean of Date   the smoothed FPA at 00:00 UT on the date of interest   +---------------------------------------------------------------------+ The heliocentric trajectory data included in this data product have been calculated by using the Equinox Epoch: defined via the "Mean of Date" method. More precise coordinates, and some planet-centered coordinates, are found in the "traj" subdirectories of spacecraft specific directories at https://spdf.gsfc.nasa.gov/pub/data/ and http://ssd.jpl.nasa.gov/horizons.cgi.
DOI: 10.48322/jv8m-ra10
title: LANL 1989 Magnetospheric Plasma Analyzer (MPA) at 87 sec Resolution in Spacecraft Coordinates
title: LANL 046 MPA data

description: The LANL 1989-046 MPA data set contains various parameters in a variety of coordinates systems including GEI, spacecraft, polar geographic, and polar magnetic coordinates at about 87 s resolution. These parameters include universal time, denisty, velocity, and temperature for both low and high energy ions and electrons as well as position information and instrument status flags.
DOI: 10.48322/7xdy-y825
title: LANL 1989 Geosynchronous Orbit Particle Analyzer (SOPA) at 60 sec Resolution in Spacecraft Coordinates
title: LANL 046 SOPA data

description: The LANL 1989-046 SOPA data set contains various parameters in a variety of coordinates systems including GEI, spacecraft, polar geographic, and polar magnetic coordinates at about 60 s resolution. These parameters include universal time, spacecraft location, electron and on density, electron and on temperature, electron and ion particle flux, electron and ion energies, electron and ion rangies, and data quality flags.
DOI: 10.48322/b3yv-mf47
title: LANL1990 Magnetospheric Plasma Analyzer (MPA) at 87 sec Resolution in Spacecraft Coordinates
title: LANL 095 MPA data

description: The LANL 1990-095 MPA data set contains various parameters in a variety of coordinates systems including GEI, spacecraft, polar geographic, and polar magnetic coordinates at about 87 s resolution. These parameters include universal time, denisty, velocity, and temperature for both low and high energy ions and electrons as well as position information and instrument status flags.
DOI: 10.48322/zzr5-dd89
title: LANL 1990 Geosynchronous Orbit Particle Analyzer (SOPA) at 60 sec Resolution in Spacecraft Coordinates
title: LANL 095 SOPA data

description: The LANL 1990-095 SOPA data set contains various parameters in a variety of coordinates systems including GEI, spacecraft, polar geographic, and polar magnetic coordinates at about 60 s resolution. These parameters include universal time, spacecraft location, electron and on density, electron and on temperature, electron and ion particle flux, electron and ion energies, electron and ion rangies, and data quality flags.
DOI: 10.48322/1jyx-5h51
title: LANL 1991 Geosynchronous Orbit Particle Analyzer (SOPA) at 60 sec Resolution in Spacecraft Coordinates
title: LANL 095 SOPA data

description: The LANL 1991-080 SOPA data set contains various parameters in a variety of coordinates systems including GEI, spacecraft, polar geographic, and polar magnetic coordinates at about 60 s resolution. These parameters include universal time, spacecraft location, electron and on density, electron and on temperature, electron and ion particle flux, electron and ion energies, electron and ion rangies, and data quality flags.
DOI: 10.48322/5jaw-x105
title: LANL1991 Magnetospheric Plasma Analyzer (MPA) at 87 sec Resolution in Spacecraft Coordinates
title: LANL 080 MPA data

description: The LANL 1991-080 MPA data set contains various parameters in a variety of coordinates systems including GEI, spacecraft, polar geographic, and polar magnetic coordinates at about 87 s resolution. These parameters include universal time, denisty, velocity, and temperature for both low and high energy ions and electrons as well as position information and instrument status flags.
DOI: 10.48322/8y0b-0s77
title: LANL1994Magnetospheric Plasma Analyzer (MPA) at 87 sec Resolution in Spacecraft Coordinates
title: LANL 084 MPA data

description: The LANL 1994-084 MPA data set contains various parameters in a variety of coordinates systems including GEI, spacecraft, polar geographic, and polar magnetic coordinates at about 87 s resolution. These parameters include universal time, denisty, velocity, and temperature for both low and high energy ions and electrons as well as position information and instrument status flags.
DOI: 10.48322/2hyb-ms72
title: LANL1997 MPA High Resolution Data

description: LANL1997 Magnetospheric Plasma Analyzer High Resolution Ion and Electron Data
DOI: 10.48322/abg8-2403
title: LANL 1994 Geosynchronous Orbit Particle Analyzer (SOPA) at 60 sec Resolution in Spacecraft Coordinates
title: LANL 095 SOPA data

description: The LANL 1994-084 SOPA data set contains various parameters in a variety of coordinates systems including GEI, spacecraft, polar geographic, and polar magnetic coordinates at about 60 s resolution. These parameters include universal time, spacecraft location, electron and on density, electron and on temperature, electron and ion particle flux, electron and ion energies, electron and ion rangies, and data quality flags.
DOI: 10.48322/pb5s-re17
title: LANL1997 Magnetospheric Plasma Analyzer (MPA) at 87 sec Resolution in Spacecraft Coordinates
title: LANL 97A MPA data

description: The LANL 1997-97A MPA data set contains various parameters in a variety of coordinates systems including GEI, spacecraft, polar geographic, and polar magnetic coordinates at about 87 s resolution. These parameters include universal time, denisty, velocity, and temperature for both low and high energy ions and electrons as well as position information and instrument status flags.
DOI: 10.48322/51vv-e118
title: LANL 1997 Geosynchronous Orbit Particle Analyzer (SOPA) at 60 sec Resolution in Spacecraft Coordinates
title: LANL 97A SOPA data

description: The LANL 1997-97A SOPA data set contains various parameters in a variety of coordinates systems including GEI, spacecraft, polar geographic, and polar magnetic coordinates at about 60 s resolution. These parameters include universal time, spacecraft location, electron and on density, electron and on temperature, electron and ion particle flux, electron and ion energies, electron and ion rangies, and data quality flags.
DOI: 10.48322/6jar-ra45
title: LANL 2001 Magnetospheric Plasma Analyzer (MPA) at 87 sec Resolution in Spacecraft Coordinates
title: LANL 01A MPA data

description: The LANL 01A MPA data set contains numerical moments computed from measurements of the Los Alamos Magnetospheric Plasma Analyzer (MPA) [Bame et al., Rev. Sci. Inst., in press 1993]. The moments are presented in s/c coordinates: the z-axis is aligned with the spin axis, which points radially toward the center of the Earth; the x-axis is in the plane containing the spacecraft spin axis and the spin axis of the Earth, with +X generally northward; and the y-axis points generally eastward. Polar angles are measured relative to the spin axis (+Z), and azimuthal angles are measured around the z-axis, with zero along the +X direction. The moments are computed for three 'species': lop (low-ener. ions, ~1eV/e-~130eV/e); hip (hi-ener. ions, ~130eV/e-~45keV/e); alle (electrons, ~30eV - ~45keV ). The electron measurements are obtained 21.5 secs after the ion measurements. Epoch is the measurement time appropriate for the ions. The moments are computed after the fluxes are corrected for background and s/c potential. Algorithms for these corrections are relatively unsophisticated, so the moments are suspect during times of high background and/or high spacecraft potential. Because the determined spacecraft potential is not very precise, the magnitude of the low-energy ion flow velocity is probably not accurate, but the flow direction is well determined. Tperp and Tpara are obtained from diagonalization of the 3-dimensional temperature matrix, with the parallel direction assigned to the eigenvalue which is most different from the other two. The corresponding eigenvector is the symmetry axis of the distribution and should be equivalent to the magnetic field direction. The eigenvalue ratio Tperp/Tmid, which is provided for each species, is a measure of the symmetry of the distribution and should be ~1.0 for a good determination. Several of the parameters have a fairly high daily dynamic range and for survey purposes are best displayed logarithmically. These parameters are indicated by non-zero 'SCALEMIN' values in this file. A quality flag value of 1 indicates that the values are suspect because of unreliable location info.
DOI: 10.48322/4e3y-y925
title: Mars Science Laboratory Ephemeris, Heliocentric Trajectories, Heliographic, Heliographic Inertial, and Solar Ecliptic Coordinates, HelioWeb, Daily Data

description: Heliocentric trajectories for Mars Science Laboratory in Heliographic, HG, Heliographic Inertial, HGI, and Solar Ecliptic, SE, Coordinates The original trajectory data are taken from http://ssd.jpl.nasa.gov/horizons.cgi where users can find many more objects. In the case of orbit data for planets, the orbit data can be used as a proxy for spacecraft ephemeris that are in orbit about the planets. On a heliospheric scale, differences between the planet orbital tarjectory and that of the spacecraft are very small. For instance, the heliocentric longitudes differ by only 0.25° for a spacecraft stationed near the L1 Lagrange point at approximately 100 Earth radii upstream of the Earth. The production of the HG, HGI, and SE trajectory data requires a values for the "Equinox Epoch", which is defined as the epoch time when the direction from the Earth to the sun at the time of the vernal equinox when the sun seems to cross equatorial plane of the Earth from below. This direction is called the First Point of Aries, FPA and it is not a fixed direction but drifts by about 1.4° per century or 50.26" per year. In addition, there are tiny irregularities in FPA drift that are on the order of 1" per year or less. The Equinox Epoch can be determined by using a variety of methods for calculating the instantaneous FPA longitudinal direction and whether the tiny irregularities have been smoothed or averaged out. Four methods for determining the Equinox Epoch are in common usage: +---------------------------------------------------------------------+   Method Name   FPA Longitude Definition    ---------------------------------------------------------------------    B1950.0   the actual FPA at 22:09 UT on December 31, 1949     J2000.0   the smoothed FPA at 12:00 UT on January 1, 2000     True of Date   the actual FPA at 00:00 UT on the date of interest     Mean of Date   the smoothed FPA at 00:00 UT on the date of interest   +---------------------------------------------------------------------+ The heliocentric trajectory data included in this data product have been calculated by using the Equinox Epoch: defined via the "Mean of Date" method. More precise coordinates, and some planet-centered coordinates, are found in the "traj" subdirectories of spacecraft specific directories at https://spdf.gsfc.nasa.gov/pub/data/ and http://ssd.jpl.nasa.gov/horizons.cgi.
DOI: 10.48322/z6y7-r007
title: LANL 2002 Magnetospheric Plasma Analyzer (MPA) at 87 sec Resolution in Spacecraft Coordinates
title: LANL 02A MPA data

description: The LANL 02A MPA data set contains numerical moments computed from measurements of the Los Alamos Magnetospheric Plasma Analyzer (MPA) [Bame et al., Rev. Sci. Inst., in press 1993]. The moments are presented in s/c coordinates: the z-axis is aligned with the spin axis, which points radially toward the center of the Earth; the x-axis is in the plane containing the spacecraft spin axis and the spin axis of the Earth, with +X generally northward; and the y-axis points generally eastward. Polar angles are measured relative to the spin axis (+Z), and azimuthal angles are measured around the z-axis, with zero along the +X direction. The moments are computed for three 'species': lop (low-ener. ions, ~1eV/e-~130eV/e); hip (hi-ener. ions, ~130eV/e-~45keV/e); alle (electrons, ~30eV - ~45keV ). The electron measurements are obtained 21.5 secs after the ion measurements. Epoch is the measurement time appropriate for the ions. The moments are computed after the fluxes are corrected for background and s/c potential. Algorithms for these corrections are relatively unsophisticated, so the moments are suspect during times of high background and/or high spacecraft potential. Because the determined spacecraft potential is not very precise, the magnitude of the low-energy ion flow velocity is probably not accurate, but the flow direction is well determined. Tperp and Tpara are obtained from diagonalization of the 3-dimensional temperature matrix, with the parallel direction assigned to the eigenvalue which is most different from the other two. The corresponding eigenvector is the symmetry axis of the distribution and should be equivalent to the magnetic field direction. The eigenvalue ratio Tperp/Tmid, which is provided for each species, is a measure of the symmetry of the distribution and should be ~1.0 for a good determination. Several of the parameters have a fairly high daily dynamic range and for survey purposes are best displayed logarithmically. These parameters are indicated by non-zero 'SCALEMIN' values in this file. A quality flag value of 1 indicates that the values are suspect because of unreliable location info.
DOI: 10.48322/90ar-hx32
title: MAVEN Ephemeris, Heliocentric Trajectories, Heliographic, Heliographic Inertial, and Solar Ecliptic Coordinates, HelioWeb, Daily Data

description: Heliocentric trajectories for MAVEN in Heliographic, HG, Heliographic Inertial, HGI, and Solar Ecliptic, SE, Coordinates The original trajectory data are taken from http://ssd.jpl.nasa.gov/horizons.cgi where users can find many more objects. In the case of orbit data for planets, the orbit data can be used as a proxy for spacecraft ephemeris that are in orbit about the planets. On a heliospheric scale, differences between the planet orbital tarjectory and that of the spacecraft are very small. For instance, the heliocentric longitudes differ by only 0.25° for a spacecraft stationed near the L1 Lagrange point at approximately 100 Earth radii upstream of the Earth. The production of the HG, HGI, and SE trajectory data requires a values for the "Equinox Epoch", which is defined as the epoch time when the direction from the Earth to the sun at the time of the vernal equinox when the sun seems to cross equatorial plane of the Earth from below. This direction is called the First Point of Aries, FPA and it is not a fixed direction but drifts by about 1.4° per century or 50.26" per year. In addition, there are tiny irregularities in FPA drift that are on the order of 1" per year or less. The Equinox Epoch can be determined by using a variety of methods for calculating the instantaneous FPA longitudinal direction and whether the tiny irregularities have been smoothed or averaged out. Four methods for determining the Equinox Epoch are in common usage: +---------------------------------------------------------------------+   Method Name   FPA Longitude Definition    ---------------------------------------------------------------------    B1950.0   the actual FPA at 22:09 UT on December 31, 1949     J2000.0   the smoothed FPA at 12:00 UT on January 1, 2000     True of Date   the actual FPA at 00:00 UT on the date of interest     Mean of Date   the smoothed FPA at 00:00 UT on the date of interest   +---------------------------------------------------------------------+ The heliocentric trajectory data included in this data product have been calculated by using the Equinox Epoch: defined via the "Mean of Date" method. More precise coordinates, and some planet-centered coordinates, are found in the "traj" subdirectories of spacecraft specific directories at https://spdf.gsfc.nasa.gov/pub/data/ and http://ssd.jpl.nasa.gov/horizons.cgi.
DOI: 10.48322/b9da-ph25
title: MAVEN Magnetometer (MAG) Magnetic Field and Orbital Position, Sun-State and Payload Coordinates, Level 2 (L2), 1 s Data

description: The MAVEN Magnetic Field Investigation is Part of a comprehensive Particles and Fields Subsystem that will measure the Magnetic and Electric Fields and Plasma Environment of Mars and its Interaction with the Solar Wind. This Data Product includes Magnetic Field Observations in Sun-State and Payload Coordinates. Sun-State, SS, Coordinate System wherein the Primary Reference Vector, the X-axis, points from the Object, in this case Mars, to the Sun and the Secondary Reference Vector, the Y-axis, is in the Mars Orbit Plane, which is approximately opposite to Orbital Motion Direction, such that the Z-axis is Northward. The Observations Spacecraft Payload, PL, Coordinates are suitable for use in association with Measurements obtained by other Instruments on the Spacecraft. The Spacecraft Payload Coordinate System and the MAG Sensor Coordinate Systems are illustrated in Figure 21 of Connerney et al., 2015. The Text appearing here is also adapted from Connerney et al., 2015.
DOI: 10.48322/p7yg-g215
title: MAVEN (Multiple Instrument Ensemble) In-situ Observations, Data Product Bundle, Key Parameter (KP), 4 s Data

description: The MAVEN In-situ Calibrated Level 2, L2, Science Data Bundle contains selected fully calibrated Data from the Neutral Gas and Ion Mass Spectrometer, NGIMS, Instrument and the Particles and Fields Package together with Ephemeris Information. The Particle and Fields In-situ Instrument Data are from the Extreme Ultraviolet, EUV, Langmuir Probe and Waves, LPW, Antenna, Magnetometer, MAG, Solar Energetic Particles, SEP, SupraThermal And Thermal Ion Composition, STATIC, Solar Wind Electron Analyzer, SWEA, and Solar Wind Ion Analyzer, SWIA, Instruments. All of these Data are in Physical Units and are averaged and/or sampled at a uniform 4 s Cadence. These In-situ Data are derived directly from the Level 2 Data. The Ephemeris Data are derived by using SPICE Libraries and Kernels provided by MAVEN Navigation, NAV, Team and Lockheed-Martin.
DOI: 10.48322/sx90-xh93
title: MESSENGER Ephemeris, Heliocentric Trajectories, Heliographic, Heliographic Inertial, and Solar Ecliptic Coordinates, HelioWeb, Daily Data

description: Heliocentric trajectories for MESSENGER in Heliographic, HG, Heliographic Inertial, HGI, and Solar Ecliptic, SE, Coordinates The original trajectory data are taken from http://ssd.jpl.nasa.gov/horizons.cgi where users can find many more objects. In the case of orbit data for planets, the orbit data can be used as a proxy for spacecraft ephemeris that are in orbit about the planets. On a heliospheric scale, differences between the planet orbital tarjectory and that of the spacecraft are very small. For instance, the heliocentric longitudes differ by only 0.25° for a spacecraft stationed near the L1 Lagrange point at approximately 100 Earth radii upstream of the Earth. The production of the HG, HGI, and SE trajectory data requires a values for the "Equinox Epoch", which is defined as the epoch time when the direction from the Earth to the sun at the time of the vernal equinox when the sun seems to cross equatorial plane of the Earth from below. This direction is called the First Point of Aries, FPA and it is not a fixed direction but drifts by about 1.4° per century or 50.26" per year. In addition, there are tiny irregularities in FPA drift that are on the order of 1" per year or less. The Equinox Epoch can be determined by using a variety of methods for calculating the instantaneous FPA longitudinal direction and whether the tiny irregularities have been smoothed or averaged out. Four methods for determining the Equinox Epoch are in common usage: +---------------------------------------------------------------------+   Method Name   FPA Longitude Definition    ---------------------------------------------------------------------    B1950.0   the actual FPA at 22:09 UT on December 31, 1949     J2000.0   the smoothed FPA at 12:00 UT on January 1, 2000     True of Date   the actual FPA at 00:00 UT on the date of interest     Mean of Date   the smoothed FPA at 00:00 UT on the date of interest   +---------------------------------------------------------------------+ The heliocentric trajectory data included in this data product have been calculated by using the Equinox Epoch: defined via the "Mean of Date" method. More precise coordinates, and some planet-centered coordinates, are found in the "traj" subdirectories of spacecraft specific directories at https://spdf.gsfc.nasa.gov/pub/data/ and http://ssd.jpl.nasa.gov/horizons.cgi.
DOI: 10.48322/541v-1f57
title: MMS 1 Active Spacecraft Potential Control (ASPOC), Sensors 1 and 2, Level 2 (L2), Survey Mode, 1 s Data
title: MMS1_ASPOC_SRVY_L2

description: MMS 1 Active Spacecraft Potential Control (ASPOC) - Sensors 1 and 2 Ion Beam Current Rates, Beam Energies, and Instrument Status variables. In tenuous plasma regions, the floating potential of a sunlit spacecraft is positively charged, reaching up to tens of Volts. The corresponding electric field disturbs the ambient plasma measurements obtained from electron and ion sensors and the large fluxes of attracted photo-electrons can significantly reduce the lifetime of the micro-channel plate. The electric field measurements can be also contaminated by the high spacecraft potential values. The Active Spacecraft Potential Control neutralizes the spacecraft potential by releasing positively charged Indium ions. The ASPOCs neutralize the electrical potential of the spacecraft, limiting or eliminating spurious electric fields that can contaminate measurements. This allows observations of the more scientifically important low-energy ions and electrons.