{
  "Spase": {
    "xmlns": "http://www.spase-group.org/data/schema",
    "xmlns:xsi": "http://www.w3.org/2001/XMLSchema-instance",
    "xsi:schemaLocation": "http://www.spase-group.org/data/schema http://www.spase-group.org/data/schema/spase-2_6_1.xsd",
    "_Note": "Nodes prefixed with a _ are not valid SPASE, but are included for debugging. Values prefixed with a x_ are not valid SPASE but may considered for addition for completeness.",
    "Version": "2.6.1",
    "_MasterURL": "https://cdaweb.gsfc.nasa.gov/pub/software/cdawlib/0JSONS/psp_fld_l3_rfs_lfr_qtn_00000000_v01.json (from all.xml)",
    "NumericalData": {
      "ResourceID": "spase://NASA/NumericalData/ParkerSolarProbe/FIELDS/RFS_LFR/Level3/QuasiThermalNoise/VariableCadence",
      "_ResourceID": "Source: https://github.com/rweigel/cdawmeta-spase/blob/main/ResourceID.json",
      "ResourceHeader": {
        "ResourceName": "PSP FIELDS Level 3 Electron Density Data from Radio Frequency Spectrometer (RFS) Low Frequency Receiver (LFR) Quasi-Thermal Noise (QTN) Spectroscopy",
        "_ResourceName": "Source: Master/CDFglobalAttributes/Logical_source_description",
        "AlternateName": "psp_fld_l3_rfs_lfr_qtn",
        "_AlternateName": "Source: Master/CDFglobalAttributes/Logical_source",
        "Description": "Quasi-thermal noise (QTN) spectroscopy is an efficient tool for measuring in situ macroscopic plasma properties in space, using a passive wave receiver at the ports of an electric antenna [1]. The Radio Frequency Spectrometer (RFS) is a dual channel digital spectrometer, designed for both remote sensing of radio waves and in situ measurement of electrostatic fluctuations using signals from the V1-V4 electric field antennas [2]. Usually, the two RFS channels record differences between V1-V2 and V3-V4 antennas (dipole mode). It allows us to retrieve plasma properties independently by two sets of antennas. The plasma line is automatically identified in a frequency range determined by the density model based on spacecraft distance from the Sun. The frequency range is manually adjusted for intervals when the plasma line occurs at lower or higher frequencies than predicted. We assume that the plasma line is well identified if detected at the same frequency by the V1-V2 and V3-V4 dipoles simultaneously. We assume that the plasma frequency is equal to the geometric mean of the plasma line and the preceding  frequency channel. In other words, the plasma frequency corresponds to the steepest positive slope below the plasma line. The provided error bars are calculated from the frequency resolution of the RFS instrument.[1] Meyer-Vernet, N., Issautier, K., & Moncuquet, M. (2017). Quasi-thermal noise spectroscopy: The art and the practice. Journal of Geophysical Research: Space Physics, 122, 7925-7945. https://doi.org/10.1002/2017ja024449[2] Bale, S. D., Goetz, K., Harvey, P. R., Turin, P., Bonnell, J. W., Dudok de Wit, T., et al. (2016). The FIELDS instrument suite for Solar probe plus. Measuring the coronal plasma and magnetic field, plasma waves and turbulence, and radio signatures of Solar transients. Space Science Reviews, 204(1-4), 49-82. https://doi.org/10.1007/s11214-016-0244-5",
        "_Description": "Source: Master/CDFglobalAttributes/TEXT",
        "Acknowledgement": "This project acknowledges the Parker Solar Probe FIELDS instrument team and the FIELDS science data center for providing these solar wind plasma measurements.",
        "_Acknowledgement": "Source: Master/CDFglobalAttributes/Acknowledgement",
        "_Rights": {
          "Name": "SPDX",
          "Description": "Creative Commons Zero v1.0 Universal",
          "URL": "https://spdx.org/licenses/CC0-1.0.html",
          "SchemeURI": "https://spdx.org/licenses/"
        },
        "InformationURL": [
          {
            "Name": "FIELDS instrument paper",
            "URL": "https://link.springer.com/article/10.1007/s11214-016-0244-5",
            "Description": "PSP/FIELDS/RFS/LFR data available at",
            "Language": "en",
            "_Note": "URL also in all.xml, master. Using InformationURL.json."
          },
          {
            "Name": "Data Link",
            "URL": "http://fields.ssl.berkeley.edu/data/",
            "Description": "PSP/FIELDS SOC",
            "Language": "en",
            "_Note": "URL also in master. Using InformationURL.json."
          },
          {
            "Name": "The Quasi-thermal noise (QTN) spectroscopy paper",
            "URL": "https://doi.org/10.1002/2017JA024449",
            "Description": "PSP/FIELDS/RFS/LFR data available at",
            "Language": "en",
            "_Note": "URL also in master. Using InformationURL.json."
          }
        ]
      },
      "Caveats": "NASA open data policy applies. Consultation with the instrument team is strongly recommended.",
      "_Caveats": "Source: Master/CDFglobalAttributes/Rules_of_use",
      "DOI": null,
      "_DOI": "Source: https://github.com/rweigel/cdawmeta-spase/blob/main/DOI.json",
      "AccessInformation": [
        {
          "RepositoryID": "spase://SMWG/Repository/NASA/GSFC/SPDF",
          "Availability": "Online",
          "AccessRights": "Open",
          "Acknowledgement": "SPDF/CDAWeb. Please also acknowledge the data producer: Stuart D. Bale (bale@ssl.berkeley.edu) at UC Berkeley Space Sciences Laboratory",
          "Format": [
            "CDF"
          ],
          "Style": "Listing",
          "AccessURL": {
            "Name": "HTTPS from SPDF",
            "URL": "https://cdaweb.gsfc.nasa.gov/pub/data/psp/fields/l3/rfs_lfr_qtn",
            "Description": "In CDF via HTTP from CDAWeb",
            "AccessFilenameTemplate": "psp_fld_l3_rfs_lfr_qtn_%Y%m%d_%Y%m%d_%Q.cdf",
            "ProductKey": "PSP_FLD_L3_RFS_LFR_QTN"
          }
        },
        {
          "RepositoryID": "spase://SMWG/Repository/NASA/GSFC/SPDF",
          "Availability": "Online",
          "AccessRights": "Open",
          "Acknowledgement": "SPDF/CDAWeb. Please also acknowledge the data producer: Stuart D. Bale (bale@ssl.berkeley.edu) at UC Berkeley Space Sciences Laboratory",
          "Format": [
            "CDF"
          ],
          "Style": "Listing",
          "AccessURL": {
            "Name": "FTPS from SPDF",
            "URL": "ftps://cdaweb.gsfc.nasa.gov/pub/data/psp/fields/l3/rfs_lfr_qtn",
            "Description": "In CDF via HTTP from CDAWeb",
            "AccessFilenameTemplate": "psp_fld_l3_rfs_lfr_qtn_%Y%m%d_%Y%m%d_%Q.cdf",
            "ProductKey": "PSP_FLD_L3_RFS_LFR_QTN"
          }
        },
        {
          "RepositoryID": "spase://SMWG/Repository/NASA/GSFC/SPDF",
          "Availability": "Online",
          "AccessRights": "Open",
          "Acknowledgement": "SPDF/CDAWeb. Please also acknowledge the data producer: Stuart D. Bale (bale@ssl.berkeley.edu) at UC Berkeley Space Sciences Laboratory",
          "Format": [
            "CDF",
            "CSV",
            "GIF",
            "NetCDF",
            "PNG",
            "PS",
            "PDF",
            "XML",
            "x_Script.IDL",
            "x_Script.Python",
            "Text.ASCII",
            "x_WAV"
          ],
          "AccessURL": {
            "Name": "CDAWeb Web Service",
            "URL": "https://cdaweb.gsfc.nasa.gov/WebServices/",
            "Style": "WebService",
            "Description": "Instructions for using web services to access this dataset an other other metadata and options for CDAWeb datasets. The ProductKey here corresponds to the query parameter 'dataset' in the tables at the AccessURL in a dataset-related request can be made.",
            "ProductKey": "PSP_FLD_L3_RFS_LFR_QTN"
          }
        },
        {
          "RepositoryID": "spase://SMWG/Repository/NASA/GSFC/SPDF",
          "Availability": "Online",
          "AccessRights": "Open",
          "Acknowledgement": "SPDF/CDAWeb. Please also acknowledge the data producer: Stuart D. Bale (bale@ssl.berkeley.edu) at UC Berkeley Space Sciences Laboratory",
          "Format": [
            "CDF",
            "GIF",
            "PDF",
            "Text.ASCII",
            "x_WAV"
          ],
          "AccessURL": {
            "Name": "CDAWeb Web Service user interface",
            "URL": "https://cdaweb.gsfc.nasa.gov/cgi-bin/eval2.cgi?index=sp_phys&dataset=PSP_FLD_L3_RFS_LFR_QTN",
            "Style": "WebService",
            "ProductKey": "PSP_FLD_L3_RFS_LFR_QTN",
            "Description": "Web service user interface for this product."
          }
        },
        {
          "RepositoryID": "spase://SMWG/Repository/NASA/GSFC/SPDF",
          "Availability": "Online",
          "AccessRights": "Open",
          "Acknowledgement": "SPDF/CDAWeb. Please also acknowledge the data producer: Stuart D. Bale (bale@ssl.berkeley.edu) at UC Berkeley Space Sciences Laboratory",
          "Format": [
            "x_Script.IDL",
            "x_Script.Python"
          ],
          "AccessURL": {
            "Name": "CDAWeb Python Script",
            "URL": "https://cdaweb.gsfc.nasa.gov/WS/cdasr/1/dataviews/sp_phys/datasets/PSP_FLD_L3_RFS_LFR_QTN/clientLibraryExample/",
            "ProductKey": "PSP_FLD_L3_RFS_LFR_QTN",
            "Style": "WebService",
            "Description": "Web service that generates a Python script to access this product."
          }
        },
        {
          "RepositoryID": "spase://SMWG/Repository/NASA/GSFC/SPDF",
          "Availability": "Online",
          "AccessRights": "Open",
          "Acknowledgement": "SPDF/SSCWeb. Please also acknowledge the data producer: Stuart D. Bale (bale@ssl.berkeley.edu) at UC Berkeley Space Sciences Laboratory",
          "Format": [
            "HTML"
          ],
          "AccessURL": {
            "Name": "4D Orbit Viewer",
            "URL": "https://sscweb.gsfc.nasa.gov/4dorbit/?sc=PSP_FLD_L3_RFS_LFR_QTN",
            "ProductKey": "PSP_FLD_L3_RFS_LFR_QTN",
            "Style": "x_Visualization",
            "Description": "Web Service to this product."
          }
        },
        {
          "RepositoryID": "spase://SMWG/Repository/NASA/GSFC/SPDF",
          "Availability": "Online",
          "AccessRights": "Open",
          "Acknowledgement": "SPDF/CDAWeb and the HAPI project. Please also acknowledge the data producer: Stuart D. Bale (bale@ssl.berkeley.edu) at UC Berkeley Space Sciences Laboratory",
          "Format": [
            "CSV",
            "JSON",
            "Binary"
          ],
          "AccessURL": {
            "Name": "CDAWeb HAPI Server",
            "URL": "https://hapi-server.org/servers/#server=CDAWeb&dataset=PSP_FLD_L3_RFS_LFR_QTN",
            "Style": "HAPI",
            "ProductKey": "PSP_FLD_L3_RFS_LFR_QTN",
            "Description": "Web Service to this product using the HAPI interface."
          }
        },
        {
          "RepositoryID": "spase://SMWG/Repository/NASA/GSFC/SPDF",
          "Availability": "Online",
          "AccessRights": "Open",
          "Acknowledgement": "SPDF/CDAWeb and the HAPI project. Please also acknowledge the data producer: Stuart D. Bale (bale@ssl.berkeley.edu) at UC Berkeley Space Sciences Laboratory",
          "Format": [
            "x_Script.IDL",
            "x_Script.Javascript",
            "x_Script.MATLAB",
            "x_Script.Python",
            "x_Script.Autoplot",
            "x_Script.curl",
            "x_Script.wget"
          ],
          "AccessURL": {
            "Name": "CDAWeb HAPI Script in Multiple Languages",
            "URL": "https://hapi-server.org/servers/#server=CDAWeb&dataset=PSP_FLD_L3_RFS_LFR_QTN&return=script",
            "Style": "HAPI",
            "ProductKey": "PSP_FLD_L3_RFS_LFR_QTN",
            "Description": "Web Service user interface that generates scripts in IDL, Javascript, MATLAB, Python, Autoplot, curl, wget to access this product. See https://hapi-server.org/servers/api for the API."
          }
        },
        {
          "RepositoryID": "spase://SMWG/Repository/NASA/GSFC/SPDF",
          "Availability": "Online",
          "AccessRights": "Open",
          "Acknowledgement": "SPDF/CDAWeb and the HAPI project. Please also acknowledge the data producer: Stuart D. Bale (bale@ssl.berkeley.edu) at UC Berkeley Space Sciences Laboratory",
          "Format": [
            "PNG",
            "PDF",
            "SVG"
          ],
          "AccessURL": {
            "Name": "HAPI visualizations",
            "URL": "https://hapi-server.org/plot/?server=https://cdaweb.gsfc.nasa.gov/hapi&dataset=PSP_FLD_L3_RFS_LFR_QTN&format=gallery",
            "Style": "x_Visualization",
            "ProductKey": "PSP_FLD_L3_RFS_LFR_QTN",
            "Description": "Web Service that generates plots. See https://hapi-server.org/plot/ for the API."
          }
        }
      ],
      "_AccessInformation": "Source: https://github.com/rweigel/cdawmeta-spase/blob/main/AccessInformation.json",
      "TemporalDescription": {
        "TimeSpan": {
          "StartDate": "2018-10-19T00:11:48Z",
          "StopDate": "2024-04-08T07:29:54Z"
        },
        "_TemporalDescription": "Generated from all.xml/@timerange_start and all.xml/@timerange_stop",
        "Cadence": "PT6.990479S",
        "_Cadence": "Counts based on variable 'Epoch' in https://cdaweb.gsfc.nasa.gov/sp_phys/data/psp/fields/l3/rfs_lfr_qtn/psp_fld_l3_rfs_lfr_qtn_20181019_20181031_v01.cdf. The most common cadence, 6990478720 [ns] = PT6.990479S, occurred for 22.9998% of the 3671 timesteps. "
      },
      "Keyword": [
        "Parker Solar Probe FIELDS (from all.xml/observatory/description/@short)",
        "Radio Frequency Spectrometer LFR (from all.xml/instrument/description/@short)",
        "Solar Physics (from Master/CDFglobalAttributes/Discipline)",
        "Heliospheric Physics (from Master/CDFglobalAttributes/Discipline)",
        "Space Physics (from Master/CDFglobalAttributes/Discipline)",
        "Interplanetary Studies (from Master/CDFglobalAttributes/Discipline)",
        "PSP_FLD (from Master/CDFglobalAttributes/Source_name)",
        "Parker Solar Probe FIELDS (from Master/CDFglobalAttributes/Source_name)",
        "L3 (from Master/CDFglobalAttributes/Data_type)",
        "Solar Wind Electron Density (from Master/CDFglobalAttributes/Data_type)",
        "RFS_LFR_QTN (from all.xml/instrument/@ID)"
      ],
      "ObservedRegion": [
        "Heliosphere",
        "Heliosphere.Inner",
        "Heliosphere.NearEarth",
        "Sun.Corona"
      ],
      "_ObservedRegion": "Source: https://github.com/rweigel/cdawmeta-spase/blob/main/ObservedRegion.json",
      "ProcessingLevel": null,
      "_ProcessingLevel": "Processing level is not available in the master file; it should be there instead of, say, https://github.com/rweigel/cdawmeta-spase/blob/main/ProcessingLevel.json",
      "InstrumentID": "spase://SMWG/Instrument/ParkerSolarProbe/RFS",
      "MeasurementType": "ThermalPlasma",
      "Parameter2": [
        {
          "Name": "Epoch",
          "ParameterKey": "Epoch",
          "Description": "CATDESC: 'CDF TT2000 time [ns]'. Notes not in Master CDF: 'The units are the units in CDF files. For other web services, this variable is may be represented as a time string.'",
          "Units": "ns",
          "Support": {
            "Qualifier": "Scalar",
            "SupportQuantity": "Temporal"
          }
        },
        {
          "Name": "Electron density",
          "ParameterKey": "N_elec",
          "Description": "Master CDF CATDESC: 'QTN electron density'. Master CDF VAR_NOTES: ''. Notes not in Master CDF: 'The time index (the ISTP DEPEND_0 variable) for this parameter is Epoch.'",
          "Units": "cm^{-3}",
          "FillValue": -1e+31
        },
        {
          "Name": "Electron density, lower uncertainty",
          "ParameterKey": "N_elec_deltalow",
          "Description": "Master CDF CATDESC: 'Lower uncertainty associated with QTN electron density'. Master CDF VAR_NOTES: ''. Notes not in Master CDF: 'The time index (the ISTP DEPEND_0 variable) for this parameter is Epoch.'",
          "Units": "cm^{-3}",
          "FillValue": -1e+31
        },
        {
          "Name": "Electron density, upper uncertainty",
          "ParameterKey": "N_elec_deltahigh",
          "Description": "Master CDF CATDESC: 'Upper uncertainty associated with QTN electron density'. Master CDF VAR_NOTES: ''. Notes not in Master CDF: 'The time index (the ISTP DEPEND_0 variable) for this parameter is Epoch.'",
          "Units": "cm^{-3}",
          "FillValue": -1e+31
        },
        {
          "Name": "Data quality flag",
          "ParameterKey": "N_elec_dqf",
          "Description": "Master CDF CATDESC: 'Array of density data quality indicators'. Master CDF VAR_NOTES: 'All flags are encoded as follows: -------------------------- = 0,   peak at channel 0 only = 1,   peak at channel 1 only = 2,   different peaks at channel 0 and channel 1 = 3,   near peaks at channel 0 and channel 1 = 4,   same peaks at channel 0 and channel 1 = 5,   same peaks at channel 0 and channel 1 with outlier data points excluded (best quality)'. Notes not in Master CDF: 'The time index (the ISTP DEPEND_0 variable) for this parameter is Epoch.'",
          "Units": " ",
          "FillValue": 255
        },
        {
          "Name": "Frequency Range, Lower Boundary",
          "ParameterKey": "Frequency_low",
          "Description": "Master CDF CATDESC: 'Lower boundary of the frequency range with the peak'. Master CDF VAR_NOTES: ''. Notes not in Master CDF: 'The time index (the ISTP DEPEND_0 variable) for this parameter is Epoch.'",
          "Units": "Hz",
          "FillValue": -1e+31
        },
        {
          "Name": "Frequency Range, Upper Boundary",
          "ParameterKey": "Frequency_high",
          "Description": "Master CDF CATDESC: 'Upper boundary of the frequency range with the peak'. Master CDF VAR_NOTES: ''. Notes not in Master CDF: 'The time index (the ISTP DEPEND_0 variable) for this parameter is Epoch.'",
          "Units": "Hz",
          "FillValue": -1e+31
        },
        {
          "Name": "Electron density (channel 0)",
          "ParameterKey": "N_elec_ch0",
          "Description": "Master CDF CATDESC: 'QTN electron density at channel 0'. Master CDF VAR_NOTES: ''. Notes not in Master CDF: 'The time index (the ISTP DEPEND_0 variable) for this parameter is Epoch.'",
          "Units": "cm^{-3}",
          "FillValue": -1e+31
        },
        {
          "Name": "Electron density (channel 0), lower uncertainty",
          "ParameterKey": "N_elec_ch0_deltalow",
          "Description": "Master CDF CATDESC: 'Lower uncertainty associated with QTN electron density at channel 0'. Master CDF VAR_NOTES: ''. Notes not in Master CDF: 'The time index (the ISTP DEPEND_0 variable) for this parameter is Epoch.'",
          "Units": "cm^{-3}",
          "FillValue": -1e+31
        },
        {
          "Name": "Electron density (channel 0), upper uncertainty",
          "ParameterKey": "N_elec_ch0_deltahigh",
          "Description": "Master CDF CATDESC: 'Upper uncertainty associated with QTN electron density at channel 0'. Master CDF VAR_NOTES: ''. Notes not in Master CDF: 'The time index (the ISTP DEPEND_0 variable) for this parameter is Epoch.'",
          "Units": "cm^{-3}",
          "FillValue": -1e+31
        },
        {
          "Name": "Electron density (channel 1)",
          "ParameterKey": "N_elec_ch1",
          "Description": "Master CDF CATDESC: 'QTN electron density at channel 1'. Master CDF VAR_NOTES: ''. Notes not in Master CDF: 'The time index (the ISTP DEPEND_0 variable) for this parameter is Epoch.'",
          "Units": "cm^{-3}",
          "FillValue": -1e+31
        },
        {
          "Name": "Electron density (channel 1), lower uncertainty",
          "ParameterKey": "N_elec_ch1_deltalow",
          "Description": "Master CDF CATDESC: 'Lower uncertainty associated with QTN electron density at channel 1'. Master CDF VAR_NOTES: ''. Notes not in Master CDF: 'The time index (the ISTP DEPEND_0 variable) for this parameter is Epoch.'",
          "Units": "cm^{-3}",
          "FillValue": -1e+31
        },
        {
          "Name": "Electron density (channel 1), upper uncertainty",
          "ParameterKey": "N_elec_ch1_deltahigh",
          "Description": "Master CDF CATDESC: 'Upper uncertainty associated with QTN electron density at channel 1'. Master CDF VAR_NOTES: ''. Notes not in Master CDF: 'The time index (the ISTP DEPEND_0 variable) for this parameter is Epoch.'",
          "Units": "cm^{-3}",
          "FillValue": -1e+31
        },
        {
          "Name": "Position in HEEQ coordinates (X-component)",
          "ParameterKey": "HEEQ_X",
          "Description": "Master CDF CATDESC: 'Position vector in HEEQ coordinates (Define Rs = 695700km) (X-component)'. Master CDF VAR_NOTES: ''. Notes not in Master CDF: 'The time index (the ISTP DEPEND_0 variable) for this parameter is Epoch.'",
          "Units": "Rs",
          "FillValue": -1e+31
        },
        {
          "Name": "Position in HEEQ coordinates (Y-component)",
          "ParameterKey": "HEEQ_Y",
          "Description": "Master CDF CATDESC: 'Position vector in HEEQ coordinates (Define Rs = 695700km) (Y-component)'. Master CDF VAR_NOTES: ''. Notes not in Master CDF: 'The time index (the ISTP DEPEND_0 variable) for this parameter is Epoch.'",
          "Units": "Rs",
          "FillValue": -1e+31
        },
        {
          "Name": "Position in HEEQ coordinates (Z-component)",
          "ParameterKey": "HEEQ_Z",
          "Description": "Master CDF CATDESC: 'Position vector in HEEQ coordinates (Define Rs = 695700km) (Z-component)'. Master CDF VAR_NOTES: ''. Notes not in Master CDF: 'The time index (the ISTP DEPEND_0 variable) for this parameter is Epoch.'",
          "Units": "Rs",
          "FillValue": -1e+31
        }
      ]
    }
  }
}