{"HAPI": "3.0", "status": {"code": 1200, "message": "OK"}, "x_dataset": "GRACE_A_MAG", "x_datasetType": "GRACE_x_MAG", "startDate": "2008-01-01T00:00:04.787680Z", "stopDate": "2017-10-31T23:59:38.945023Z", "cadence": "PT1S", "x_maxTimeSelection": "P5D", "modificationDate": "2025-08-05T02:11:34.149Z", "description": "GRACE 1 platform magnetometer measurements", "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://doi.org/10.1186/s40623-021-01373-9", "parameters": [{"name": "Timestamp", "description": "Time stamp", "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": "Latitude", "description": "Position in ITRF - Latitude", "units": "deg", "type": "double", "x_type": "float64", "fill": null}, {"name": "Longitude", "description": "Position in ITRF - Longitude", "units": "deg", "type": "double", "x_type": "float64", "fill": null}, {"name": "Radius", "description": "Position in ITRF - Radius", "units": "m", "type": "double", "x_type": "float64", "fill": null}, {"name": "B_FGM", "size": [3], "description": "calibrated magnetic vector from FGM, in instrument frame", "units": "nT", "type": "double", "x_type": "float64", "fill": null}, {"name": "B_NEC_raw", "size": [3], "description": "calibrated and aligned magnetic vector in NEC (North, East, Center) frame", "units": "nT", "type": "double", "x_type": "float64", "fill": null}, {"name": "B_NEC", "size": [3], "description": "calibrated and aligned magnetic vector in NEC (North, East, Center) frame, 11 sample (i.e. 11 second) robust average", "units": "nT", "type": "double", "x_type": "float64", "fill": null}, {"name": "F", "description": "magnetic field intensity determined from B_NEC", "units": "nT", "type": "double", "x_type": "float64", "fill": null}, {"name": "q_NEC_CRF", "size": [4], "description": "Quaternion, transformation: NEC <- CRF", "units": null, "type": "double", "x_type": "float64", "fill": null}, {"name": "q_error", "description": "experimental error indicator of attitude given in Quaternion q_NEC_CRF. Bad attitude if > approx 40", "units": "mdeg", "type": "double", "x_type": "float64", "fill": null}, {"name": "B_NEC_Model", "size": [3], "description": "CHAOS magnetic model", "units": "nT", "type": "double", "x_type": "float64", "fill": null}, {"name": "F_Model", "description": "CHAOS magnetic model, field intensity", "units": "nT", "type": "double", "x_type": "float64", "fill": null}, {"name": "F_res_Model", "description": "magnetic field intensity determined from B_NEC, CHAOS magnetic model residual", "units": "nT", "type": "double", "x_type": "float64", "fill": null}, {"name": "B_NEC_res_Model", "size": [3], "description": "calibrated and aligned magnetic vector in NEC (North, East, Center) frame, 11 sample (i.e. 11 second) robust average, CHAOS magnetic model residual", "units": "nT", "type": "double", "x_type": "float64", "fill": null}]}