{"HAPI": "3.0", "status": {"code": 1200, "message": "OK"}, "x_dataset": "SW_OPER_NIX_TMS_2F", "x_datasetType": "SW_NIX_TMS_2F", "startDate": "2014-01-01T00:00:06.446000Z", "stopDate": "2026-04-04T23:59:54.241000Z", "cadence": "PT8S", "x_maxTimeSelection": "P40D", "modificationDate": "2026-04-10T06:41:07.067Z", "description": "Swarm electron density gradient ionosphere index (NEGIX)", "x_dataTerms": "This dataset is provided by the European Space Agency and it is subject to terms condition described in https://vires.services/data_terms.", "resourceURL": "https://swarmhandbook.earth.esa.int/catalogue/SW_NIX_TMS_2F", "parameters": [{"name": "Timestamp", "description": "Timestamp", "units": "UTC", "type": "isotime", "length": 24, "x_standard": "UTC", "x_epoch": "1970-01-01T00:00:00Z", "x_unit": "ms", "x_type": "int64", "fill": null}, {"name": "Longitude", "description": "Position of the NEGIX vector in ITRF - longitude", "units": "deg", "type": "double", "x_type": "float64", "fill": null}, {"name": "Latitude", "description": "Position of the NEGIX vector in ITRF - latitude", "units": "deg", "type": "double", "x_type": "float64", "fill": null}, {"name": "Distance", "description": "Averaged distance from all dipoles used for the estimation of NEGIX", "units": "m", "type": "double", "x_type": "float64", "fill": null}, {"name": "Azimuth", "description": "Averaged azimuth from all dipoles used for the estimation of NEGIX", "units": "deg", "type": "double", "x_type": "float64", "fill": null}, {"name": "Negix_X", "description": "Mean value of NEGIX for the West-East component", "units": "electron cm$^{-3}$ m$^{-1}$", "type": "double", "x_type": "float64", "fill": null}, {"name": "Negix_X_Sigma", "description": "Standard deviation value of NEGIX for the West-East component", "units": "electron cm$^{-3}$ m$^{-1}$", "type": "double", "x_type": "float64", "fill": null}, {"name": "Negix_X_P95", "description": "95-percentile value of NEGIX for the West-East component", "units": "electron cm$^{-3}$ m$^{-1}$", "type": "double", "x_type": "float64", "fill": null}, {"name": "Negix_Y", "description": "Mean value of NEGIX for the South-North component", "units": "electron cm$^{-3}$ m$^{-1}$", "type": "double", "x_type": "float64", "fill": null}, {"name": "Negix_Y_Sigma", "description": "Standard deviation value of NEGIX for the South-North component", "units": "electron cm$^{-3}$ m$^{-1}$", "type": "double", "x_type": "float64", "fill": null}, {"name": "Negix_Y_P95", "description": "95-percentile value of NEGIX for the South-North component", "units": "electron cm$^{-3}$ m$^{-1}$", "type": "double", "x_type": "float64", "fill": null}, {"name": "Negix_Total", "description": "Total vector value of NEGIX, derived from the mean West-East and South-North components", "units": "electron cm$^{-3}$ m$^{-1}$", "type": "double", "x_type": "float64", "fill": null}, {"name": "Negix_Sigma", "description": "Vector value of the standard deviation of NEGIX, derived from the standard deviation values of West-East and South-North components", "units": "electron cm$^{-3}$ m$^{-1}$", "type": "double", "x_type": "float64", "fill": null}, {"name": "Negix_P95", "description": "Vector value of the 95-percentile of NEGIX, derived from the 95-percentile values of West-East and South-North components", "units": "electron cm$^{-3}$ m$^{-1}$", "type": "double", "x_type": "float64", "fill": null}, {"name": "N_Measurements", "description": "Number of elements for a data record from which NEGIX is determined", "units": null, "type": "integer", "x_type": "uint16", "fill": null}, {"name": "Flag_Negix", "description": "Flags characterizing the dispersion of gradient values that are used to compute the total vector ", "units": null, "type": "integer", "x_type": "uint8", "fill": null}, {"name": "Orbit_Label", "description": "Flag defining whether the magnitude belongs to an ascending (1) or descending (-1) orbit of the Swarm satellites", "units": null, "type": "integer", "x_type": "int8", "fill": null}]}