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        {
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        {
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              "0": "ACE>Analyzer for Cusp Electrons"
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              "0": "J. Halekas"
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        {
          "PI_affiliation": [
            {
              "0": "The University of Iowa"
            }
          ]
        },
        {
          "TEXT": [
            {
              "0": "The ACE L2 data consist of raw measured counts and calibrated differential energy fluxes as a function of anode angle and calibrated energy. Counts are accumulated in 21 discrete anodes with different viewing angles for each of 49 energy steps, with a basic measurement cadence of 50 ms. Counts are converted to differential energy flux by subtracting an estimate of the background and then dividing by the instrument calibration matrix. The estimated background count rates and calibration matrix are included in the L2 data files, enabling application of alternative background subtraction methods or calibrations.  Background estimates include two sources: 1) Instrumental background due to electronics crosstalk, which is constant across all anodes but varies with energy. 2) Natural background due to penetrating energetic particles and natural radioactivity in the microchannel plate detectors, which is constant across all anodes and energies. Subtraction of background can lead to negative differential energy fluxes, especially for low count rate data. Depending on the use case, these negative values can either be retained or replaced with zeroes.  The calibration matrix incorporates instrument sensitivity and relative sensitivity factors for each anode, both estimated based upon a combination of pre-flight laboratory calibrations and inflight data. Energy values for each energy step and anode are computed utilizing the known sweep voltage table and pre-flight laboratory calibrations.  The ACE instrument was intended to be operated in a particular spacecraft orientation, with the TSCS +Z axis aligned with the magnetic field. In this orientation, incoming electron trajectories are not occluded by the spacecraft. However, for a portion of the TRACERS mission, the spacecraft are oriented in the opposite sense, which leads to an occlusion of a portion of the instrument field of view by the spacecraft body for low-energy (<~200 eV) electrons. Low-energy ACE data should not be utilized for quantitative purposes when the spacecraft are in this orientation."
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        {
          "Rules_of_use": [
            {
              "0": "https://tracers.physics.uiowa.edu/rules-use"
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        {
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              "0": " "
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        {
          "MODS": [
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        {
          "LINK_TEXT": [
            {
              "0": "TRACERS data"
            }
          ]
        },
        {
          "LINK_TITLE": [
            {
              "0": "TRACERS"
            }
          ]
        },
        {
          "HTTP_LINK": [
            {
              "0": "https://tracers.physics.uiowa.edu/"
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          ]
        },
        {
          "Acknowledgement": [
            {
              "0": "Jasper Halekas"
            }
          ]
        },
        {
          "Time_resolution": [
            {
              "0": "50 ms in ROI; 6.4s in BOR"
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          ]
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                {
                  "LABLAXIS": "UTC Epoch"
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                  "MONOTON": "INCREASE"
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                {
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                  "VAR_NOTES": "Epoch at midpoint of each ACE energy sweep."
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                  "UNITS": "eV"
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                  "VAR_NOTES": "Energy in eV at the midpoint of each bin in the ACE energy sweep. This value does not factor in the 2nd-order variation of energy values by anode number (see the l2_ace_energy_anode_factor variable)."
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                "E34",
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                {
                  "VAR_NOTES": "Multiplicative factor that adjusts the energy bin values for each anode. This is a 2nd-order effect caused by variation of <TBD> at each anode. For example, l2_ace_energy[I] * l2_ace_energy_anode_factor gives the energy values at each of the 21 anodes for bin I, correct to 2nd order."
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                  "VAR_TYPE": "support_data"
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                  "VAR_NOTES": "Angle giving the direction, in the TSCS Z-Y plane, from the center of the ACE anode plane towards the center of each anode. Angles start at zero along the TSCS +Z axis and increase towards the TSCS -Y axis. Negative angles are measured from the +Z axis towards the +Y axis. These angles represent the direction of travel of electrons detected by this anode."
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                {
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                0.98481,
                0.93969,
                0.86603,
                0.76604,
                0.64279,
                0.5,
                0.34202,
                0.17365,
                -4.3711e-08,
                -0.17365,
                -0.34202,
                -0.5,
                -0.64279,
                -0.76604,
                -0.86603,
                -0.93969,
                -0.98481,
                -1.0,
                -0.98481
              ]
            }
          ]
        },
        {
          "ts2_l2_ace_def": [
            {
              "VarDescription": [
                {
                  "DataType": "CDF_REAL4"
                },
                {
                  "NumElements": 1
                },
                {
                  "NumDims": 2
                },
                {
                  "DimSizes": [
                    49,
                    21
                  ]
                },
                {
                  "RecVariance": "VARY"
                },
                {
                  "DimVariances": [
                    "VARY",
                    "VARY"
                  ]
                },
                {
                  "PadValue": -1e+30
                }
              ]
            },
            {
              "VarAttributes": [
                {
                  "CATDESC": "Electron differential energy flux at 49 energies over 21 look directions."
                },
                {
                  "DEPEND_0": "Epoch"
                },
                {
                  "DEPEND_1": "ts2_l2_ace_energy"
                },
                {
                  "DEPEND_2": "ts2_l2_ace_TSCS_anode_angle"
                },
                {
                  "DICT_KEY": "particle_flux>electron_differential"
                },
                {
                  "DISPLAY_TYPE": "spectrogram>y=ts2_l2_ace_energy,z=ts2_l2_ace_def(*,^21)"
                },
                {
                  "FIELDNAM": "ACE Differential Energy Flux"
                },
                {
                  "FILLVAL": "NaN"
                },
                {
                  "FORMAT": "E10.3"
                },
                {
                  "LABLAXIS": "e- Flux"
                },
                {
                  "LABL_PTR_1": "ts2_l2_ace_energy_label"
                },
                {
                  "LABL_PTR_2": "ts2_l2_ace_anode_label"
                },
                {
                  "SCALETYP": "log"
                },
                {
                  "VALIDMIN": -22000000.0
                },
                {
                  "VALIDMAX": 1e+30
                },
                {
                  "UNITS": "eV eV!E-1!Ncm!E-2!Nsr!E-1!Ns!E-1!N"
                },
                {
                  "VAR_TYPE": "data"
                },
                {
                  "VAR_NOTES": "ACE electron differential energy flux as a function of epoch,  energy (49 bins) and look angle (21 directions). Note that small negative values are allowed, due to background subtraction."
                }
              ]
            }
          ]
        },
        {
          "ts2_l2_ace_counts": [
            {
              "VarDescription": [
                {
                  "DataType": "CDF_UINT2"
                },
                {
                  "NumElements": 1
                },
                {
                  "NumDims": 2
                },
                {
                  "DimSizes": [
                    49,
                    21
                  ]
                },
                {
                  "RecVariance": "VARY"
                },
                {
                  "DimVariances": [
                    "VARY",
                    "VARY"
                  ]
                },
                {
                  "PadValue": 65534
                }
              ]
            },
            {
              "VarAttributes": [
                {
                  "CATDESC": "Electron raw counts at 49 energies over 21 look directions."
                },
                {
                  "DEPEND_0": "Epoch"
                },
                {
                  "DEPEND_1": "ts2_l2_ace_energy"
                },
                {
                  "DEPEND_2": "ts2_l2_ace_TSCS_anode_angle"
                },
                {
                  "DICT_KEY": "particle_flux>electron_differential_count"
                },
                {
                  "DISPLAY_TYPE": "spectrogram>y=ts2_l2_ace_energy,z=ts2_l2_ace_counts(*,^21)"
                },
                {
                  "FIELDNAM": "Electron Counts"
                },
                {
                  "FILLVAL": 65535
                },
                {
                  "FORMAT": "I4"
                },
                {
                  "LABLAXIS": "Counts"
                },
                {
                  "LABL_PTR_1": "ts2_l2_ace_energy_label"
                },
                {
                  "LABL_PTR_2": "ts2_l2_ace_anode_label"
                },
                {
                  "VALIDMIN": 0
                },
                {
                  "VALIDMAX": 4095
                },
                {
                  "UNITS": "raw counts"
                },
                {
                  "VAR_TYPE": "data"
                },
                {
                  "VAR_NOTES": "Electron counts as a function of epoch, energy (49 bins) and look angle (21 directions)."
                }
              ]
            }
          ]
        },
        {
          "ts2_l2_ace_background_counts": [
            {
              "VarDescription": [
                {
                  "DataType": "CDF_REAL4"
                },
                {
                  "NumElements": 1
                },
                {
                  "NumDims": 2
                },
                {
                  "DimSizes": [
                    49,
                    21
                  ]
                },
                {
                  "RecVariance": "VARY"
                },
                {
                  "DimVariances": [
                    "VARY",
                    "VARY"
                  ]
                },
                {
                  "PadValue": -1e+30
                }
              ]
            },
            {
              "VarAttributes": [
                {
                  "CATDESC": "Background counts for each energy bin and anode."
                },
                {
                  "DEPEND_0": "Epoch"
                },
                {
                  "DEPEND_1": "ts2_l2_ace_energy"
                },
                {
                  "DEPEND_2": "ts2_l2_ace_TSCS_anode_angle"
                },
                {
                  "DISPLAY_TYPE": "spectrogram>y=ts2_l2_ace_energy,z=ts2_l2_ace_background_counts(*,^21)"
                },
                {
                  "FIELDNAM": "Background Counts"
                },
                {
                  "FILLVAL": "NaN"
                },
                {
                  "FORMAT": "E10.3"
                },
                {
                  "LABLAXIS": "Bg Cnts"
                },
                {
                  "LABL_PTR_1": "ts2_l2_ace_energy_label"
                },
                {
                  "LABL_PTR_2": "ts2_l2_ace_anode_label"
                },
                {
                  "VALIDMIN": 0.0
                },
                {
                  "VALIDMAX": 100000.0
                },
                {
                  "UNITS": "background counts"
                },
                {
                  "VAR_TYPE": "data"
                },
                {
                  "VAR_NOTES": "Estimate of the background counts at each anode for each bin of each energy sweep. these counts have been subtracted from l2_ace_counts prior to the calculation of the differential energy flux."
                }
              ]
            }
          ]
        },
        {
          "ts2_l2_ace_cal_matrix": [
            {
              "VarDescription": [
                {
                  "DataType": "CDF_REAL4"
                },
                {
                  "NumElements": 1
                },
                {
                  "NumDims": 2
                },
                {
                  "DimSizes": [
                    49,
                    21
                  ]
                },
                {
                  "RecVariance": "VARY"
                },
                {
                  "DimVariances": [
                    "VARY",
                    "VARY"
                  ]
                },
                {
                  "PadValue": -1e+30
                }
              ]
            },
            {
              "VarAttributes": [
                {
                  "CATDESC": "Counts to differential energy flux calibration matrix."
                },
                {
                  "DEPEND_0": "Epoch"
                },
                {
                  "DEPEND_1": "ts2_l2_ace_energy"
                },
                {
                  "DEPEND_2": "ts2_l2_ace_TSCS_anode_angle"
                },
                {
                  "DISPLAY_TYPE": "spectrogram"
                },
                {
                  "FIELDNAM": "Calibration Matrix"
                },
                {
                  "FILLVAL": "NaN"
                },
                {
                  "FORMAT": "E10.3"
                },
                {
                  "LABLAXIS": "Cal Matrix"
                },
                {
                  "LABL_PTR_1": "ts2_l2_ace_energy_label"
                },
                {
                  "LABL_PTR_2": "ts2_l2_ace_anode_label"
                },
                {
                  "VALIDMIN": -1e+30
                },
                {
                  "VALIDMAX": 1e+30
                },
                {
                  "UNITS": " <<TBD>> "
                },
                {
                  "VAR_TYPE": "support_data"
                },
                {
                  "VAR_NOTES": "The relative sensitivity matrix giving the calibration from counts to differential energy flux for each energy step and look direction."
                }
              ]
            }
          ]
        }
      ],
      "EmptyAttributes": [
        {
          "VariableAttributes": [
            "DEPEND_3",
            "LABL_PTR_3",
            "REFERENCE_FRAME"
          ]
        }
      ]
    }
  }
}