{ "created_at": "2026-04-28T15:18:06.037761+00:00", "elapsed": 0.20496, "encoding": "utf-8", "expires": "2026-05-13T15:22:00.559380+00:00", "headers": { "Accept-Ranges": "bytes", "Access-Control-Allow-Headers": "Content-Type", "Access-Control-Allow-Methods": "GET", "Access-Control-Allow-Origin": "*", "Connection": "Keep-Alive", "Content-Length": "25811", "Content-Security-Policy": "frame-ancestors 'self' *.gsfc.nasa.gov;", "Content-Type": "application/json", "Date": "Wed, 13 May 2026 15:22:00 GMT", "ETag": "\"5de8-650860a01c90d\"", "Keep-Alive": "timeout=2, max=40", "Last-Modified": "Tue, 28 Apr 2026 14:28:03 GMT", "Server": "Apache", "Strict-Transport-Security": "max-age=63072000; includeSubdomains; preload" }, "reason": "OK", "request": { "body": "", "headers": { "Accept": "*/*", "Accept-Encoding": "gzip, deflate", "Connection": "keep-alive", "User-Agent": "python-requests/2.25.1" }, "method": "GET", "url": "https://cdaweb.gsfc.nasa.gov/pub/software/cdawlib/0JSONS/ts2_l2_msc_bac_00000000_v01.json?https" }, "status_code": 200, "url": "https://cdaweb.gsfc.nasa.gov/pub/software/cdawlib/0JSONS/ts2_l2_msc_bac_00000000_v01.json?https", "_decoded_content": { "ts2_l2_msc_bac_00000000_v01.cdf": { "CDFFileInfo": [ { "FileVersion": "3.9.1" }, { "Format": "SINGLE" }, { "Majority": "COLUMN" }, { "Encoding": "IBMPC" } ], "CDFglobalAttributes": [ { "Logical_file_id": [ { "0": "ts2_l2_msc_bac" } ] }, { "Processing_level": [ { "0": " " } ] }, { "ParserConfig_version": [ { "0": " " } ] }, { "Data_version": [ { "0": " " } ] }, { "SpiceQuasistatic_version": [ { "0": " " } ] }, { "SpiceLocation_version": [ { "0": " " } ] }, { "Discipline": [ { "0": "Space Physics>Magnetospheric Science" } ] }, { "TisDecomp_revdate": [ { "0": " " } ] }, { "Instrument_type": [ { "0": "Magnetic Fields (space)" } ] }, { "PI_name": [ { "0": "David Miles" } ] }, { "CoI_affiliation": [ { "0": "The University of Iowa" } ] }, { "Mission_group": [ { "0": "TRACERS" } ] }, { "ParserConfig_revdate": [ { "0": "\u0000" } ] }, { "TEXT": [ { "0": "TRACERS 2 Magnetic Search Coil (MSC), High Resolution data. This dataset consistsof a set a sparsely spaced 3-axis search coil time series sweeps during back orbit. Each time series sweep consists of 16384 samples evenly spaced in time, the time duration of each sweep is \u00bd s. The 3-axis search coil data are in the body fixed TRACERS Spacecraft Coordinate System (TSCS) and Field-Aligned Coordinates (FAC). Even though the data are in units of nT further calibration is required.Calibration notes: The amplitude and phase require further calibration given in the table ts2_msc_calibration. To use this table: (1) Perform FFT of desired on each Epoch of waveform data.(2a) If your FFT is less then 16384 points sub-sample the frequency calibration table.(2b) If your FFT is greater than 16384 points interpolate between points in the calibration table.(3) Divide positive FFT frequencies by listed complex calibration values.(4) Divide negative FFT frequencies by complex conjugate of listed calibration values.(5) Perform inverse FFT to return the signal to time domain if desired.Note this calibration increases the amplitude of low frequency components by quite a bit. To recover the spin frequency component, you may need to string multiple packets together in your FFT. This should *only* be done if all Epoch values are near 0.5 seconds apart. For instrument paper see https://doi.org/10.1007/s11214-025-01200-7. For coordinate system definition see appendix of https://doi.org/10.1007/s11214-025-01199-x." } ] }, { "PI_affiliation": [ { "0": "The University of Iowa" } ] }, { "Rules_of_use": [ { "0": "https://tracers.physics.uiowa.edu/rules-use" } ] }, { "Logical_source": [ { "0": "TS2_L2_MSC_BAC" } ] }, { "Project": [ { "0": "LWS>Living With a Star" } ] }, { "Generated_by": [ { "0": "The University of Iowa" } ] }, { "TisDecomp_version": [ { "0": " " } ] }, { "Logical_source_description": [ { "0": "TRACERS 2 Magnetic Search Coil (MSC), High Resolution data" } ] }, { "TITLE": [ { "0": "Search Coil Magnetic Field 3-Vectors at 2048 Hz" } ] }, { "Descriptor": [ { "0": "MSC>Magnetic Search Coil" } ] }, { "Source_name": [ { "0": "TS2>TRACERS 2" } ] }, { "CoI_name": [ { "0": " " } ] }, { "SPICE_FRAMES": [ { "0": " " } ] }, { "Data_type": [ { "0": "H0>High Resolution data" } ] }, { "Time_resolution": [ { "0": "0.5 ms" } ] }, { "Parents": [ { "0": " " } ] }, { "SPICE_KERNELS": [ { "0": " " } ] }, { "File_naming_convention": [ { "0": "source_descriptor_datatype_yyyyMMdd" } ] }, { "MSCProcessor_version": [ { "0": " " } ] }, { "Verified": [ { "0": " " } ] } ], "CDFVariables": [ { "Epoch": [ { "VarDescription": [ { "DataType": "CDF_TIME_TT2000" }, { "NumElements": 1 }, { "NumDims": 0 }, { "RecVariance": "VARY" }, { "PadValue": "0000-01-01T00:00:00.000000000" } ] }, { "VarAttributes": [ { "FILLVAL": "9999-12-31T23:59:59.999999999" }, { "UNITS": "ns" }, { "VAR_TYPE": "support_data" }, { "DICT_KEY": "time>Epoch" }, { "MONOTON": "INCREASE" }, { "REFERENCE_POSITION": "Rotating Earth Geoid" }, { "TIME_BASE": "J2000" }, { "TIME_SCALE": "Terrestrial Time" }, { "FORMAT": "I20" }, { "CATDESC": "Time, start, in UTC" }, { "FIELDNAM": "Time, start, in UTC" }, { "VALIDMAX": "2050-01-01T00:00:00.000000000" }, { "VALIDMIN": "2022-02-01T00:00:00.000000000" } ] } ] }, { "Epoch_expanded": [ { "VarDescription": [ { "DataType": "CDF_TIME_TT2000" }, { "NumElements": 1 }, { "NumDims": 0 }, { "RecVariance": "VARY" }, { "PadValue": "0000-01-01T00:00:00.000000000" } ] }, { "VarAttributes": [ { "FILLVAL": "9999-12-31T23:59:59.999999999" }, { "UNITS": "ns" }, { "VAR_TYPE": "support_data" }, { "MONOTON": "INCREASE" }, { "CATDESC": "Expanded times" }, { "FIELDNAM": "Epoch" }, { "VALIDMAX": "2050-12-31T23:59:58.999000000" }, { "VALIDMIN": "1990-01-01T00:00:00.000000000" }, { "LABLAXIS": "Time" }, { "VAR_NOTES": "REQUIRED - for Computed Epoch's based on Epoch/basetime plus timeOffsets_NRV for the VV data variables below" }, { "SCALETYP": "linear" } ] } ] }, { "ts2_location": [ { "VarDescription": [ { "DataType": "CDF_FLOAT" }, { "NumElements": 1 }, { "NumDims": 1 }, { "DimSizes": [ 3 ] }, { "RecVariance": "VARY" }, { "DimVariances": [ "VARY" ] }, { "Compression": "GZIP.9" }, { "PadValue": -1e+30 }, { "BlockingFactor": 5461 } ] }, { "VarAttributes": [ { "FILLVAL": "NaN" }, { "UNITS": "km" }, { "VAR_TYPE": "support_data" }, { "FORMAT": "%.4e" }, { "CATDESC": "Body-fixed EARTH centered location of TS2 in spherical coordinates" }, { "FIELDNAM": "TS2 in spherical IAU_EARTH" }, { "VALIDMAX": 149600000.0 }, { "VALIDMIN": -360.0 }, { "DEPEND_0": "Epoch" }, { "LABL_PTR_1": "ts2_location_comp_lbl" }, { "COORD_FRAME": "IAU_EARTH" }, { "LABLAXIS": "TS2,IAU_EARTH" }, { "VAR_NOTES": "An ISO 31-11 standard spherical system. The full component set is (r,theta,phi) where r is the radial direction, theta is the colatitude (which is 0 deg at the north pole) and phi is the eastward angle. Both theta, phi are assumed to be 0 deg if missing and r is assumed to be 1 if missing." } ] } ] }, { "flags": [ { "VarDescription": [ { "DataType": "CDF_UINT1" }, { "NumElements": 1 }, { "NumDims": 0 }, { "RecVariance": "VARY" }, { "PadValue": 254 } ] }, { "VarAttributes": [ { "FILLVAL": 255 }, { "UNITS": " " }, { "VAR_TYPE": "support_data" }, { "FORMAT": "%d" }, { "CATDESC": "Valildity Flag per Epoch" }, { "FIELDNAM": "Validity Flags" }, { "VALIDMAX": 127 }, { "VALIDMIN": 0 }, { "DEPEND_0": "Epoch" }, { "VAR_NOTES": "Flag values as a bit field. There is one flag value for each epoch, i.e. one per packet. Larger values denote bigger problems. The value 32 (2^5) indicates that data are clipped an the maximum response of the search coil. 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"metadata" }, { "FORMAT": "%s" }, { "CATDESC": "location component labels" }, { "FIELDNAM": "location component labels" } ] }, { "VarData": [ "r_IAU_EARTH ", "theta_IAU_EARTH", "phi_IAU_EARTH" ] } ] }, { "cal_frequency": [ { "VarDescription": [ { "DataType": "CDF_FLOAT" }, { "NumElements": 1 }, { "NumDims": 0 }, { "RecVariance": "VARY" }, { "PadValue": -1e+30 } ] }, { "VarAttributes": [ { "FILLVAL": -1e+31 }, { "UNITS": "Hz" }, { "VAR_TYPE": "support_data" }, { "FORMAT": "%.0f" }, { "CATDESC": "Calibration frequency" }, { "FIELDNAM": "Frequency" }, { "VALIDMAX": 1024.0 }, { "VALIDMIN": 0.0 }, { "LABLAXIS": "Freq" } ] } ] }, { "ts2_msc_calibration": [ { "VarDescription": [ { "DataType": "CDF_DOUBLE" }, { "NumElements": 1 }, { "NumDims": 1 }, { "DimSizes": [ 2 ] }, { "RecVariance": "VARY" }, { "DimVariances": [ "VARY" ] }, { "Compression": "GZIP.5" }, { "PadValue": -1e+30 }, { "BlockingFactor": 4096 } ] }, { "VarAttributes": [ { "FILLVAL": -1e+31 }, { "UNITS": "dB" }, { "VAR_TYPE": "support_data" }, { "FORMAT": "%.8f" }, { "CATDESC": "Coil Freq Response relative to 100 Hz" }, { "FIELDNAM": "Coil Freq Response relative to 100 Hz" }, { "VALIDMAX": 1.0 }, { "VALIDMIN": -1.0 }, { "DEPEND_0": "cal_frequency" }, { "LABL_PTR_1": "msc_calibration_lbl" }, { "VAR_NOTES": "Full real and imaginary frequency response for phase and amplitude correction in the frequency domain. To use this table: (1) Perform FFT of desired length on each Epoch of waveform data. (2a) If your FFT is less then 16384 points sub-sample the frequency calibration table (2b) If your FFT is more then 16384 points interpolate between points in the calibration table (3) Divide positive FFT frequencies by listed complex calibration values (4) Divide negative FFT frequencies by complex conjugate of listed calibration values. (5) Perform inverse FFT to return the signal to time domain if desired. Note this calibration increases the amplitude of low frequency components by quite a bit. In order to recover the spin frequency component you may need to string multiple packets together in your FFT. This should *only* be done if all Epoch values are near 0.5 seconds apart. " }, { "DISPLAY": "time_series" } ] } ] }, { "msc_calibration_lbl": [ { "VarDescription": [ { "DataType": "CDF_CHAR" }, { "NumElements": 9 }, { "NumDims": 1 }, { "DimSizes": [ 2 ] }, { "RecVariance": "NOVARY" }, { "DimVariances": [ "VARY" ] }, { "NumWrittenRecords": 1 }, { "PadValue": " " } ] }, { "VarAttributes": [ { "VAR_TYPE": "metadata" }, { "FORMAT": "%s" }, { "CATDESC": "Labels for ts2_msc_calibration" }, { "FIELDNAM": "Freq Response Labels" } ] }, { "VarData": [ "real", "imaginary" ] } ] }, { "msc_gain": [ { "VarDescription": [ { "DataType": "CDF_FLOAT" }, { "NumElements": 1 }, { "NumDims": 0 }, { "RecVariance": "VARY" }, { "Compression": "GZIP.5" }, { "PadValue": -1e+30 }, { "BlockingFactor": 16384 } ] }, { "VarAttributes": [ { "FILLVAL": -1e+31 }, { "UNITS": " " }, { "VAR_TYPE": "support_data" }, { "FORMAT": "%.8f" }, { "CATDESC": "Coil Freq Response relative to 100 Hz" }, { "FIELDNAM": "Coil Freq Response relative to 100 Hz" }, { "VALIDMAX": 1.10000002 }, { "VALIDMIN": 0.0 }, { "DEPEND_0": "cal_frequency" }, { "DISPLAY": "time_series" } ] } ] }, { "msc_phase": [ { "VarDescription": [ { "DataType": "CDF_FLOAT" }, { "NumElements": 1 }, { "NumDims": 0 }, { "RecVariance": "VARY" }, { "Compression": "GZIP.5" }, { "PadValue": -1e+30 }, { "BlockingFactor": 16384 } ] }, { "VarAttributes": [ { "FILLVAL": -1e+31 }, { "UNITS": "degrees" }, { "VAR_TYPE": "support_data" }, { "FORMAT": "%.8f" }, { "CATDESC": "Internal Relative Coil Phase Delay" }, { "FIELDNAM": "Internal Relative Coil Phase Delay" }, { "VALIDMAX": 720.0 }, { "VALIDMIN": -1080.0 }, { "DEPEND_0": "cal_frequency" }, { "VAR_NOTES": "These phase offsets are useful for comparison between points in the MSC dataset but are not referenced to an external source." }, { "DISPLAY": "time_series" } ] } ] }, { "ts2_l2_bac_tscs": [ { "VarDescription": [ { "DataType": "CDF_FLOAT" }, { "NumElements": 1 }, { "NumDims": 2 }, { "DimSizes": [ 1024, 3 ] }, { "RecVariance": "VARY" }, { "DimVariances": [ "VARY", "VARY" ] }, { "Compression": "GZIP.9" }, { "PadValue": -1e+30 }, { "BlockingFactor": 5 } ] }, { "VarAttributes": [ { "FILLVAL": "NaN" }, { "UNITS": "nT" }, { "VAR_TYPE": "data" }, { "DICT_KEY": "magnetic_field>AC" }, { "FORMAT": "%.3f" }, { "CATDESC": "AC Magnetic field at 2048 Hz in TRACERS Spacecraft Coordinates (TSCS) - as spectrogram" }, { "FIELDNAM": "AC Magnetic field at 2048 Hz in TSCS" }, { "VALIDMAX": 82.5 }, { "VALIDMIN": -82.5 }, { "DEPEND_0": "Epoch" }, { "COORD_FRAME": "TS2_TSCS" }, { "LABLAXIS": "B!ac!n in TS2_TSCS" }, { "VAR_NOTES": "display as spectrogram, for time series the interval times need to be computed (VV)" }, { "DEPEND_1": "EpochOffset" }, { "LABL_PTR_2": "ts2_l2_bac_tscs_comp_lbl" }, { "DISPLAY_TYPE": "spectrogram>y=EpochOffset,z=ts2_l2_bac_tscs(*,1), z=ts2_l2_bac_tscs(*,2), z=ts2_l2_bac_tscs(*,3)" }, { "SCALETYP": "linear" } ] } ] }, { "ts2_l2_bac_tscs_times": [ { "VarDescription": [ { "DataType": "CDF_FLOAT" }, { "NumElements": 1 }, { "NumDims": 2 }, { "DimSizes": [ 1024, 3 ] }, { "RecVariance": "VARY" }, { "DimVariances": [ "VARY", "VARY" ] }, { "Compression": "GZIP.9" }, { "PadValue": -1e+30 }, { "BlockingFactor": 5 } ] }, { "VarAttributes": [ { "FILLVAL": "NaN" }, { "UNITS": "nT" }, { "VAR_TYPE": "support_data" }, { "DICT_KEY": "magnetic_field>AC" }, { "FORMAT": "%.3f" }, { "CATDESC": "AC Magnetic field at 2048 Hz in TRACERS Spacecraft Coordinates (TSCS) - time series - TJK DIDNT FINISH THIS so set to SUPPORT_DATA" }, { "FIELDNAM": "AC Magnetic field at 2048 Hz in TSCS" }, { "VALIDMAX": 82.5 }, { "VALIDMIN": -82.5 }, { "DEPEND_0": "Epoch" }, { "COORD_FRAME": "TS2_TSCS" }, { "LABLAXIS": "B!ac!n in TS2_TSCS" }, { "DEPEND_1": "EpochOffset" }, { "LABL_PTR_2": "ts2_l2_bac_tscs_comp_lbl" }, { "DISPLAY_TYPE": "time_series" }, { "SCALETYP": "linear" }, { "VIRTUAL": "true" }, { "FUNCT": "expand_wave_data" }, { "COMPONENT_0": "ts2_l2_bac_tscs" }, { "COMPONENT_1": "Epoch" }, { "COMPONENT_2": "EpochOffset" } ] } ] }, { "ts2_l2_bac_tscs_comp_lbl": [ { "VarDescription": [ { "DataType": "CDF_CHAR" }, { "NumElements": 22 }, { "NumDims": 1 }, { "DimSizes": [ 3 ] }, { "RecVariance": "NOVARY" }, { "DimVariances": [ "VARY" ] }, { "NumWrittenRecords": 1 }, { "PadValue": " " } ] }, { "VarAttributes": [ { "VAR_TYPE": "metadata" }, { "FORMAT": "A22" }, { "CATDESC": "ts2_l2_bac_tscs component labels" }, { "FIELDNAM": "ts2_l2_bac_tscs components" } ] }, { "VarData": [ "B!ac!n in TS2_TSCS B_x", "B!ac!n in TS2_TSCS B_y", "B!ac!n in TS2_TSCS B_z" ] } ] }, { "ts2_l2_bac_fac": [ { "VarDescription": [ { "DataType": "CDF_FLOAT" }, { "NumElements": 1 }, { "NumDims": 2 }, { "DimSizes": [ 1024, 3 ] }, { "RecVariance": "VARY" }, { "DimVariances": [ "VARY", "VARY" ] }, { "Compression": "GZIP.9" }, { "PadValue": -1e+30 }, { "BlockingFactor": 5 } ] }, { "VarAttributes": [ { "FILLVAL": "NaN" }, { "UNITS": "nT" }, { "VAR_TYPE": "data" }, { "DICT_KEY": "magnetic_field>AC" }, { "FORMAT": "%.3f" }, { "CATDESC": "AC Magnetic field at 2048 Hz in B-Field Aligned Coordinates (FAC) - spectrogram" }, { "FIELDNAM": "AC Magnetic field at 2048 Hz in FAC" }, { "VALIDMAX": 82.5 }, { "VALIDMIN": -82.5 }, { "DEPEND_0": "Epoch" }, { "COORD_FRAME": "TS2_FAC" }, { "LABLAXIS": "B!ac!n in TS2_FAC" }, { "VAR_NOTES": "display as spectrogram, for time series the interval times need to be computed (VV)" }, { "DEPEND_1": "EpochOffset" }, { "LABL_PTR_2": "ts2_l2_bac_fac_comp_lbl" }, { "DISPLAY_TYPE": "spectrogram>y=EpochOffset,z=ts2_l2_bac_fac(*,1), z=ts2_l2_bac_fac(*,2), z=ts2_l2_bac_fac(*,3)" }, { "SCALETYP": "linear" } ] } ] }, { "ts2_l2_bac_fac_comp_lbl": [ { "VarDescription": [ { "DataType": "CDF_CHAR" }, { "NumElements": 21 }, { "NumDims": 1 }, { "DimSizes": [ 3 ] }, { "RecVariance": "NOVARY" }, { "DimVariances": [ "VARY" ] }, { "NumWrittenRecords": 1 }, { "PadValue": " " } ] }, { "VarAttributes": [ { "VAR_TYPE": "metadata" }, { "FORMAT": "A21" }, { "CATDESC": "ts2_l2_bac_fac component labels" }, { "FIELDNAM": "ts2_l2_bac_fac components" } ] }, { "VarData": [ "B!ac!n in TS2_FAC B_x", "B!ac!n in TS2_FAC B_y", "B!ac!n in TS2_FAC B_z" ] } ] } ], "EmptyAttributes": [ { "VariableAttributes": [ "calDataSource", "calDate", "CAL_METHOD", "CAL_DESCIPTION" ] } ] } } }