2.3.2 spase://NASA/NumericalData/LANL/2001/MPA/PT87S LANL 2001 Magnetospheric Plasma Analyzer (MPA) at 87 sec Resolution in Spacecraft Coordinates LANL 01A MPA data 2021-04-27T15:38:11Z 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. Los Alamos National Laboratory; Dr. Michelle Thomsen; Dr. Michael G. Henderson spase://SMWG/Person/Michelle.F.Thomsen PrincipalInvestigator spase://SMWG/Person/Michael.G.Henderson GeneralContact spase://SMWG/Person/James.M.Weygand MetadataContact Los Alamos National Laboratory Spacecraft Magnetospheric Plasma Analyzer https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/93JA00726 Journal of Geophysical Research article on the LANL MPA instrument. spase://VMO/NumericalData/LANL/LANL2001/MPA/PT87S spase://VMO/NumericalData/LANL/2001/MPA/PT87S spase://VSPO/NumericalData/LANL/2001/MPA/PT87S spase://SMWG/Repository/NASA/GSFC/SPDF/CDAWeb Online Open FTPS from SPDF (not with most browsers) ftps://spdf.gsfc.nasa.gov/pub/data/lanl/01a_mpa/ Magnetospheric Plasma Analyzer data on LANL 01A. HTTPS from SPDF https://spdf.gsfc.nasa.gov/pub/data/lanl/01a_mpa/ In CDF via HTTP from SPDF CDAWeb https://cdaweb.gsfc.nasa.gov/cgi-bin/eval2.cgi?dataset=A1_K0_MPA&index=sp_phys A1_K0_MPA subset, plot, and ASCII list from CDAWeb. CDF LANL; Dr. Michelle Thomsen; Dr. Michael G. Henderson spase://SMWG/Repository/NASA/GSFC/SPDF Online Open CDAWeb HAPI Server https://cdaweb.gsfc.nasa.gov/hapi A1_K0_MPA Web Service to this product using the HAPI interface. CSV LANL; Dr. Michelle Thomsen; Dr. Michael G. Henderson Calibrated LANL 01A MPA Numerical Data spase://SMWG/Instrument/LANL/2001/MPA EnergeticParticles 2001-08-31T00:00:00 2008-01-03T23:59:59 Time format in data files is: day, month, year hour, min, seconds. Ex: '01-Jan-1981 00:00:00.000' PT87S Flags=-1.0e+31. The content of the LANL SOPA cdfs at CDAWeb has not been fully documented. 87 sec geosynchronus LANL Magnetospheric Plasma Analyzer MPA LANL 01A MPA Time of proton collection Epoch This is the time of the proton data collection (electrons 21.5 seconds later). Universal Time in data cell: day, month, year hour, min, seconds. Ex: '01-Jan-1981 00:00:00.000'. Interval centered time tag ms '1.0e-3>s' Epoch 01-08-1992T00:00:00.000 31-12-2020T23:59:59.000 -1.0000e+031 Temporal LANL 01A MPA Time of proton collection Time_PB5 This is the time of the proton collection (electrons 21.5 seconds later). Time in the format: year, day of year, and second of the same day. Interval centered time tag Epoch 3 Date and Time Vector. Year 1 Years 1992 2020 Day of Year 2 Days 0 366 milliseconds of the day 3 ms 0 86399000 -2147483648 Temporal LANL 01A MPA Partial Density of Low Energy Ions dens_lop Partial density of low energy ions (1-130 eV/e). cm^-3 1.0e6>m^-3 low p dens 0.1 1000.0 0.0 100000.0 -1.0000e+031 Ion Scalar NumberDensity 1 130 eV/e LANL 01A MPA Velocity Vector Low-Enery Ions vel_lop LANL 01A MPA velocity vector low-enery Ions (1-130 eV/e) in spacecraft Coordinates in units of km/s. km/s 1.0e3>m s^-1 Cartesian SC -100 100 3 VX Component.I 1 VY Component.J 2 VZ Component.K 3 -2000 2000 -1.0000e+031 Ion Vector Velocity LANL 01A MPA Temperature Low Energy Ions temp_lop Temperature of low energy ions (1-130 eV/e). eV low p temp 0.1 100.0 0.0 50000.0 -1.0000e+031 Ion Scalar Temperature 1 130 eV/e LANL 01A MPA Ratio of Temperature Eigenvalues for Low-E Ions tratio_lop Ratio of temperature (Tperp/Tmid) of low energy ions (1-130 eV/e). Tper/Tmid 0.1 10.0 0.0 100.0 -1.0000e+031 Ion Ratio Temperature 1 130 eV/e LANL 01A MPA Partial Density High-E Ions dens_hip Spacecraft MPA partial density of high energy ions (.13-45 keV/e). cm^-3 hi p dens 0.01 10.0 0.0 10000.0 -1.0000e+031 Ion Scalar NumberDensity 0.13 45 keV/e LANL 01A MPA Velocity Vector High-E Ions vel_hip Velocity vector high-enery protons (.13-45 keV/e) in spacecraft Coordinates in units of km/s. km/s 1.0e3>m s^-1 Cartesian SC -200 200 3 VX Component.I 1 VY Component.J 2 VZ Component.K 3 -2000 2000 -1.0000e+031 Ion Vector Velocity LANL 01A MPA Temperature High-E Ions temp_hip Spacecraft MPA temperature of high energy ions (.13-45 keV/e). eV high p temp 100 100000.0 2 Temp Parallel Component.I 1 Temp Perpendicular Component.J 2 0.0 50000.0 -1.0000e+031 Ion Array Temperature 0.13 45 keV/e LANL 01A MPA Polar, Azimuthal Angle High-E Proton Symmetry Axis theta_phi_hip Proton symmetry axis: polar angle relative to Earth direction, azimuthal angle from the north. deg Spherical SC 2 Polar Angle DirectionAngle.PolarAngle 1 degrees 0 180 Azimuthal Angle DirectionAngle.AzimuthAngle 2 degrees -90 90 -1.0000e+031 Ion Array ArrivalDirection 0.13 45 keV/e LANL 01A MPA Ratio of Temperature Eigenvalues for High-E Ions tratio_hip Ratio of temperature (Tperp/Tmid) of low energy ions (.13-45 keV/e). Tper/Tmid 0.1 10.0 0.0 100.0 -1.0000e+031 Ion Ratio Temperature 0.13 45 keV/e LANL 01A MPA Partial Density Electrons dens_e Partial density of electrons (.03-45 keV/q). # cm^-3 elec dens 0.01 100.0 0.0 100000.0 -1.0000e+031 Electron Scalar NumberDensity 0.03 45 keV/e LANL 01A MPA Temperature Electrons temp_e Temperature of electrons (.03-45 keV/q). eV Temperatures, parallel and perp. for electrons 100 100000.0 2 Temp Parallel Component.I 1 Temp Perpendicular Component.J 2 0.0 50000.0 -1.0000e+031 Electron Array Temperature 0.03 45 keV/e LANL 01A MPA Polar, Azimuthal Angle Electron Symmetry Axis theta_phi_e Electron symmetry axis: polar angle relative to Earth direction, azimuthal angle from the north. Spherical SC 2 Polar Angle DirectionAngle.PolarAngle 1 degrees 0 180 Azimuthal Angle DirectionAngle.AzimuthAngle 2 degrees -90 90 -1.0000e+031 Electron Array ArrivalDirection 0.03 45 keV/e LANL 01A MPA Ratio of Temperature Eigenvalues for Electrons tratio_e Ratio of temperature (Tperp/Tmid) of electrons (.03-45 keV/q). Tper/Tmid 0.1 10.0 0.0 100.0 -1.0000e+031 Electron Ratio Temperature 0.03 45 keV/e LANL 01A MPA Spacecraft Potential sc_pot Spacecraft potential in units of volts. volts S/C poten. -10000.0 0.0 -20000. 0.0 -1.0000e+031 Scalar Potential LANL 01A MPA Background Count Rate (Not Clear what this is the background for) bkgd Background Count Rate. cts/9ms Backgrd 0.1 1000.0 0.0 1000.0 -1.0000e+031 Scalar Other LANL 01A MPA Spacecraft Position, Polar Geographic Coordinates sc_pos_geo Spacecraft position, polar geographic coordinates (radius,lat,long). Spherical GEO 3 Polar Geographic Coordinates. Radius Magnitude 1 EarthRadii 0 10 Latitude DirectionAngle.ElevationAngle 2 degrees -90 90 Longitude DirectionAngle.AzimuthAngle 3 degrees -180 180 -1.0000e+031 Vector Positional LANL 01A MPA Spacecraft Position, Cartesian Geocentric Celestial Inertial coordinates sc_pos_syngci Spacecraft position, cartesian coordinates (radius,lat,long). Geocentric Celestial Inertial, is earth centered, with the X-axis pointing from the Earth towards the first point of Aries (the position of the Sun at vernal equinox). This direction is the intersection of the Earth's equatorial plane and the ecliptic plane--thus the X-axis lies in both planes. The Z-axis is parallel to the rotation axis of the Earth, and the Y-axis completes a right-handed orthogonal coordinate system. The X-axis is the direction of the mean vernal equinox of J2000. This is a virtual variable generated by read_myCDF w/ useof the data in the sc_pos_geo variable and a conversion routinespecified in the function attribute, namely conv_pos. Cartesian GEI 3 Geocentric Celestial Inertial coordinates. X Component.I 1 -1000 1000 Y Component.J 2 -1000 1000 Z Component.K 3 -1000 1000 -1.0000e+031 Vector Positional LANL 01A MPA Spacecraft Position, Polar Magnetic Coordinates sc_pos_mag Spacecraft position, polar magnetic coordinates (radius,lat,long). Spherical MAG 3 Polar Magnetic Coordinates. Radius Magnitude 1 EarthRadii 0 10 Latitude DirectionAngle.ElevationAngle 2 degrees -90 90 Magnetic Local Time DirectionAngle.AzimuthAngle 3 hours 0 24 -1.0000e+031 Vector Positional LANL 01A MPA Data Quality Flag qual_flag Data quality flag. Data quality flag, 0 = ok, 1 = Results unreliable. Qual Flag 0.0 10.0 0.0 10.0 -2147483648 Scalar Other LANL 01A MPA Data Gap Flag gap_flag Data gap flag. Data gap flag, 0 = No Gap, 10 = No data available. Gap Flag 0.0 10.0 0.0 10.0 -2147483648 Scalar Other LANL 01A MPA Time Offset for Electron Measurements offset_time Time offset for electron measurements. Electron sample time is 21.5 seconds after that of ions. ms T offset 21500.0 21500.0 21500.0 21500.0 -1.0000e+031 Scalar Temporal