{ "id": "C1_WAVEFORM_WBD_BM2", "url": "http://hpde.io/VWO/NumericalData/Cluster-Rumba/WBD_BM2/PT0.0000046S", "data-file": "./data/spase_hpde_io/info/C1_WAVEFORM_WBD_BM2.json", "data": { "Spase": { "xmlns:xsi": "http://www.w3.org/2001/XMLSchema-instance", "xmlns": "http://www.spase-group.org/data/schema", "xsi:schemaLocation": "http://www.spase-group.org/data/schema http://www.spase-group.org/data/schema/spase-2_2_8.xsd", "Version": "2.2.8", "NumericalData": { "ResourceID": "spase://VWO/NumericalData/Cluster-Rumba/WBD_BM2/PT0.0000046S", "ResourceHeader": { "ResourceName": "Cluster 1 Wideband Data Plasma Wave Receiver/High Time Resolution Electric and Magnetic Waveform Data Returned via BM2", "AlternateName": [ "Cluster Rumba Wideband Data Plasma Wave Receiver/High Time Resolution Waveform Data Returned via BM2", "C1_CE_WBD_WAVEFORM_BM2_CDF", "C1_WAVEFORM_WBD_BM2" ], "ReleaseDate": "2017-10-03T17:00:00Z", "Description": "The following description applies to the Wideband Data (WBD) Plasma \nWave Receivers on all four Cluster satellites, each satellite being uniquely identified \nby its number (1 through 4) or its given name (Rumba, Salsa, Samba, Tango, \nrespectively). High time resolution calibrated waveform data sampled in one \nof 3 frequency bands in the range 0-577 kHz along one axis using either an \nelectric field antenna or a magnetic search coil sensor. The dataset also \nincludes instrument mode, data quality and the angles required to orient the \nmeasurement with respect to the magnetic field and to the GSE coordinate \nsystem. \n\nThe AC electric field data are obtained by using one of the two 88m \nspin plane electric field antennas of the EFW (Electric Fields and Waves) \ninstrument as a sensor. The AC magnetic field data are obtained by using \none of the two search coil magnetometers (one in the spin plane, the other \nalong the spin axis) of the STAFF (Spatio-Temporal Analysis of Field \nFluctuations) instrument as a sensor. The WBD data are obtained in one of \nthree filter bandwidth modes: (1) 9.5 kHz, (2) 19 kHz, or (3) 77 kHz. The \nminimum frequency of each of these three frequency bands can be shifted \nup (converted) from the default 0 kHz base frequency by 125.454, 250.908 \nor 501.816 kHz. The time resolution of the data shown in the plots is \ndetermined from the WBD instrument mode. The highest time resolution \ndata (generally the 77 kHz bandwidth mode) are sampled at 4.6 \nmicroseconds in the time domain (~4.7 milliseconds in the frequency \ndomain using a standard 1024 point FFT). The lowest time resolution data \n(generally the 9.5 kHz bandwidth mode) are sampled at 36.5 microseconds \nin the time domain (~37.3 milliseconds in the frequency domain using a \nstandard 1024 point FFT). The availability of these files depends on times of \nPanska Ves ground station telemetry downlinks. A list of the status \nof the WBD instrument on each spacecraft, the telemetry time spans, \noperating modes and other details are available under Science Data \nAvailability on the University of Iowa Cluster WBD web site at http://www-\npw.physics.uiowa.edu/cluster/ and through the documentation section of \nthe Cluster Science Archive (CSA) (https://www.cosmos.esa.int/web/csa/documentation). Details on \nCluster WBD Interpretation Issues and Caveats can be found at http://www-\npw.physics.uiowa.edu/cluster/ by clicking on the links next to the Caution symbol \nin the listing on the left side of the web site. These documents are also available \nfrom the Documentation section of the CSA website. For further details on \nthe Cluster WBD data products see Pickett, J.S., et al., \"Cluster Wideband \nData Products in the Cluster Active Archive\" in _The Cluster Active Archive_, \n2010, Springer-Verlag, pp 169-183, and the Cluster WBD User Guide \narchived at the CSA website in the Documentation section. ... \n\nCALIBRATION: ... The procedure used in computing the calibrated Electric \nField and Magnetic Field values found in this file can be obtained from the \nCluster WBD Calibration Report archived at the CSA website in the \nDocumentation section. Because the calibration was applied in the time \ndomain using simple equations the raw counts actually measured by the \nWBD instrument can be obtained by using these equations and solving for \n'Raw Counts', keeping in mind that this number is an Integer ranging from 0 \nto 255. Since DC offset is a real number, the resultant when solving for raw \ncounts will need to be converted to the nearest whole number. A sample \nIDL routine for reverse calibrating to obtain 'Raw Counts' is provided in the \nWBD Calibration Report archived at the CSA. ... \n\nCONVERSION TO FREQUENCY DOMAIN: ... In order to convert the WBD data to the frequency \ndomain via an FFT, the following steps need to be carried out: 1) If Electric \nField, first divide calibrated data values by 1000 to get V/m; 2) Apply \nwindow of preference, if any (such as Hann, etc.); 3) Divide data values by \nsqrt(2) to get back to the rms domain; 4) perform FFT (see Bandwidth \nvariable notes for non-continuous modes and/or the WBD User Guide \narchived at the CSA); 5) divide by the noise bandwidth, which is equal to \nthe sampling frequency divided by the FFT size (see table below for \nappropriate sampling frequency); 6) multiply by the appropriate constant \nfor the window used, if any. These steps are more fully explained in the \nWBD Calibration Report archived at the CSA.... \n\nBURST MODE: ...\nWBD data can also be obtained in a mode called Burst Mode 2 (BM2), stored onboard, \nand transmitted to the ground with the data from all the other instruments. \nThis mode has been rarely used throughout the mission only once prior to July 2010 (on March 7, 2001), \nbut more often thereafter to obtain data at low altitude or in the high priority auroral acceleration region, \nbecause it results in decreased bandwidth or a higher degree of duty cycling for WBD. \n\nNASA's Deep Space Network terminated WBD data acquisition in February 2015 and after that date \nWBD operations are limited to Panska Ves real time downlink (limited to altitudes below 10 RE) \nand a limited number of BM2 operations. This resulted in a decreased total weekly quota of WBD operations, \nespecially at higher altitudes where only BM2 mode is available.\nBM2 data are thus obtained primarily at outer boundaries (bow shock,\nforeshock, magnetosheath, magnetopause, plasmasheet) and during\nperigee crossings of the magnetic equator when Panska Ves does not\nhave visibility. Typically, approximately 4 operations of 1-2 hours duration\nare obtained in these regions each month.\n\n\nBM_Mode\n(0=Duty Cycled 9.5 kHz, 1-in-3,\n 1 = Duty Cycled 9.5 kHz, 1-in-4, \n 2 = Duty Cycled 19 kHz, 1-in-3, \n 3 = Duty Cycled 19 kHz, 1-in-4, \n 4 = Duty Cycled 77 kHz, 1-in-3, \n 5 = Duty Cycled 77 kHz, 1-in-4, \n 6 = Digital Filtered 9.5 kHz, 1-in-3, roll-off at 3.2 kHz \n 7 = Digital Filtered 9.5 kHz, 1-in-3, optimized roll-off at 4.2 kHz \n 8 = Digital Filtered 9.5 kHz, 1-in-4, roll-off at 2.5 kHz \n 9 = Digital Filtered 9.5 kHz, 1-in-4, optimized roll-off at 3.1 kHz)\n\n\n+--------------------------------------+ \n| Bandwidth | Sample Rate | Burst Mode |\n|-----------|-------------|------------| \n| 9.5 kHz | 27.443 kHz | 0,1 | \n| 19 kHz | 54.886 kHz | 2,3 |\n| 77 kHz | 219.544 kHz | 4,5 |\n| 9.5 kHz | 9.148 kHz | 6,7 | \n| 9.5 kHz | 6.861 kHz | 8,9 | \n+--------------------------------------+ \n\n\nCOORDINATE SYSTEM USED: ... One axis measurements made in the \nAntenna Coordinate System, i.e., if electric field measurement, it will either \nbe Ey or Ez, both of which are in the spin plane of the spacecraft, and if \nmagnetic field measurement, it will either be Bx, along the spin axis, or By, \nin spin plane. The user of WBD data should refer to the WBD User Guide, \narchived at the CSA, Section 5.4.1 and Figure 5.3 for a description of the \nthree orientation angles provided in these files. Since WBD measurements \nare made along one axis only, these three angles provide the only means for \norienting the WBD measurements with respect to a geocentric coordinate \nsystem and to the magnetic field direction ...", "Acknowledgement": "Users of the Cluster WBD data are encouraged to \nacknowledge Jolene S. Pickett, PI and Donald A. Gurnett, Co-I University of \nIowa and the Coordinated Data Analysis Web (CDAWeb) at the NASA \nGoddard Space Flight Center, or the Cluster Science Archive, as appropriate, \nas the source of the data in any publication.", "Contact": [ { "PersonID": "spase://SMWG/Person/Jolene.S.Pickett", "Role": [ "PrincipalInvestigator", "TechnicalContact" ] }, { "PersonID": "spase://SMWG/Person/Donald.A.Gurnett", "Role": [ "CoInvestigator", "FormerPI" ] } ], "InformationURL": [ { "Name": "Cluster WBD Instrument Page", "URL": "http://www-pw.physics.uiowa.edu/cluster/", "Description": "Cluster WBD Instrument page maintained by the University of \nIowa with links to instrument descriptions and team members, publications, \nlists of coordinated observing times, science data availability catalogs, data, \ndata interpretation and caveat descriptions as well as data analysis \ntools.", "Language": "en" }, { "Name": "Cluster Science Archive Documentation Page", "URL": "https://www.cosmos.esa.int/web/csa/documentation", "Description": "Cluster WBD documentation with links to lists of coordinated \nobserving times, science data availability catalogs, WBD User Guide, WBD \nCalibration Report, WBD Interface Control Document, and data \ninterpretation and caveat descriptions.", "Language": "en" } ], "PriorID": [ "", "spase://VWO/NumericalData/Cluster-Rumba/WBD/Cluster_1_Waveform_WBD" ] }, "AccessInformation": [ { "RepositoryID": "spase://SMWG/Repository/NASA/GSFC/SPDF", "Availability": "Online", "AccessRights": "Open", "AccessURL": { "Name": "FTP access to files at SPDF", "URL": "ftp://cdaweb.gsfc.nasa.gov/pub/data/cluster/c1/wbd_bm2/", "Description": "FTP access to repository of Cluster 1 WBD CDFs at NASA.Name of the data resource: C1_WAVEFORM_WBD_BM2", "Language": "en" }, "Format": "CDF", "Encoding": "None", "Acknowledgement": "Users of the Cluster WBD data are encouraged to \nacknowledge Jolene S. Pickett, PI and Donald A. Gurnett, Co-I University of \nIowa and the Coordinated Data Analysis Web (CDAWeb) at the NASA \nGoddard Space Flight Center, as the source of the data in any publication." }, { "RepositoryID": "spase://SMWG/Repository/NASA/GSFC/SPDF", "Availability": "Online", "AccessRights": "Open", "AccessURL": { "Name": "HTTP access to files at SPDF", "URL": "https://cdaweb.gsfc.nasa.gov/pub/data/cluster/c1/wbd_bm2/", "ProductKey": "C1_WAVEFORM_WBD_BM2", "Description": "HTTP access to repository of Cluster 1 WBD CDFs at NASA. Name of the data resource: \nC1_WAVEFORM_WBD_BM2.", "Language": "en" }, "Format": "CDF", "Encoding": "None", "Acknowledgement": "Users of the Cluster WBD data are encouraged to \nacknowledge Jolene S. Pickett, PI and Donald A. Gurnett, Co-I University of \nIowa and the Coordinated Data Analysis Web (CDAWeb) at the NASA \nGoddard Space Flight Center, as the source of the data in any publication." }, { "RepositoryID": "spase://SMWG/Repository/NASA/GSFC/SPDF", "Availability": "Online", "AccessRights": "Open", "AccessURL": { "Name": "CDAWeb", "URL": "https://cdaweb.gsfc.nasa.gov", "ProductKey": "C1_WAVEFORM_WBD_BM2", "Description": "Access to ASCII, CDF, and plots via NASA/GSFC CDAWeb" }, "Format": "CDF", "Encoding": "None", "Acknowledgement": "Users of the Cluster WBD data are encouraged to \nacknowledge Jolene S. Pickett, PI and Donald A. Gurnett, Co-I University of \nIowa and the Coordinated Data Analysis Web (CDAWeb) at the NASA \nGoddard Space Flight Center, as the source of the data in any publication." }, { "RepositoryID": "spase://SMWG/Repository/CSA", "Availability": "Online", "AccessRights": "Open", "AccessURL": { "Name": "Access to Cluster WBD CDFs", "URL": "https://www.cosmos.esa.int/web/csa/", "ProductKey": "C1_CE_WBD_WAVEFORM_BM2_CDF", "Description": "Access to repository of Cluster 1 Wideband data in CDF format at the Cluster Science Archive. The CDF format has the designation C[n]_CE_WBD_WAVEFORM_BM2_CDF, where n=1,2,3,4. Access to data through the Cluster Science Archive is available via a java GUI interface and a command-line interface. Access is open but registration is required.", "Language": "en" }, "Format": "CDF", "Encoding": "None", "Acknowledgement": "Users of the Cluster WBD data are encouraged to \nacknowledge Jolene S. Pickett, PI and Donald A. Gurnett, Co-I University of \nIowa and the Cluster Science Archive, as appropriate, as the source of the data in any publication." } ], "ProcessingLevel": "Calibrated", "ProviderResourceName": "High time resolution electric and magnetic waveform data returned via BM2", "InstrumentID": "spase://SMWG/Instrument/Cluster-Rumba/WBD", "MeasurementType": [ "Waves.Passive", "ElectricField", "MagneticField" ], "TemporalDescription": { "TimeSpan": { "StartDate": "2010-07-28T14:00:00Z", "RelativeStopDate": "-P210D" }, "Cadence": "PT0.0000046S" }, "SpectralRange": "RadioFrequency", "ObservedRegion": [ "Earth.Magnetosphere", "Earth.Magnetosheath", "Earth.NearSurface.Plasmasphere", "Earth.NearSurface.AuroralRegion", "Earth.NearSurface.PolarCap", "Earth.NearSurface.Ionosphere", "Heliosphere.Inner" ], "Caveats": "See the Cluster WBD WBD data Interpretation Issues and Caveats \ndocuments at the web site http://www-pw.physics.uiowa.edu/cluster/ , and \nclicking on the links next to the \"Caution\" symbol in the listing on the left \nhand side of the page. The documents can also be retrieved from the \nDocumentation section of the CSA.\n", "Keyword": [ "Time Series", "Waveform", "AKR", "Auroral hiss", "Auroral Kilometric Radiation", "Chorus", "Continuum radiation", "Equatorial Noise", "Kilometric Continuum radiation", "Plasmaspheric Hiss", "Terrestrial Kilometric Radiation", "TKR", "Very Long Baseline Interferometry", "VLBI", "Langmuir Waves", "Type III Solar Bursts", "Electostatic Solitary Waves", "ESW", "Whistlers", "Ion Acoustic Waves", "Bernstein Waves", "Upper Hybrid Waves", "Lower Hybrid Waves" ], "Parameter": { "Epoch": { "Name": "UT Time", "ParameterKey": "Epoch", "Description": "UT Time, time of WBD data point. WARNING: If Translation is not equal \n to 0, this variable represents the \n time associated with the \n down-converted waveform. This affects \n the apparent frequency content of the \n electric field amplitude when plotted \n vs. time, as well as the frequency of \n the derived components when an FFT \n is applied to the electric field data. \n Refer to the WBD User Guide \n and calibration report in the CSA\n for more information. \n\t\t\t\t NOTE: Accuracy of this \n variable is on the order of 50 \n microseconds. ", "Units": "picoseconds", "Support": { "SupportQuantity": "Temporal" } }, "Bandwidth": { "Name": "Frequency Bandwidth", "ParameterKey": "Bandwidth", "Description": "Frequency Bandwidth: 9.5 kHz, 19 kHz, 77 kHz.WARNING: Burst Modes 0 through 5 are \n not continuous data modes (see \n 'BM_Mode' variable). Always check for \n periodic time jumps for these \n modes.Values for Bandwidth are subject\n to error before mode switches or gaps\n due to Whisper soundings. Please \n refer to the caveats document in the CSA.", "Units": "kHz", "ValidMin": "0.0", "ValidMax": "80.0", "Support": { "SupportQuantity": "Other" } }, "Translation": { "Name": "Frequency Shift", "ParameterKey": "Translation", "Description": "Base freq. of freq. bandwidth (0.0, 125.454, 250.908, and \n501.816 kHz) - Also known as Conversion Frequency. WARNING: If this variable \n is not equal to 0, the electric field \n waveform (WBD_Elec vs. Epoch \n variables) is the product of a \n down-conversion to 0.0 kHz which took \n place onboard within the WBD \n instrument. This affects the apparent \n frequency content of the electric \n field amplitude when plotted vs. time,\n as well as the frequency of the \n derived components when an FFT is \n applied to the electric field data. \n Refer to the WBD User Guide \n and calibration report in the CSA\n for more information. Values for Translation are\n subject to error before mode switches\n or gaps due to Whisper soundings. \n Please refer to the caveats document.\n ", "Units": "kHz", "ValidMin": "0.0", "ValidMax": "510.0", "Support": { "SupportQuantity": "Other" } }, "Resolution": { "Name": "Digital Resolution", "ParameterKey": "Resolution", "Description": "Number of bits used when digitizing waveform (8-bit, 4-bit, or 1-\nbit)", "Units": "bits", "ValidMin": "1", "ValidMax": "8", "Support": { "SupportQuantity": "Other" } }, "ANTENNA": { "Name": "Antenna", "ParameterKey": "ANTENNA", "Description": "Antenna (0=Ez, 1=Bx, 2=By, 3=Ey)", "Support": { "SupportQuantity": "Other" } }, "Gain": { "Name": "Gain", "ParameterKey": "Gain", "Description": "Gain state of WBD instrument. Steps of 5 dB from 0 to \n75. Gain are subject to error before mode switches or gaps due\n to Whisper soundings. Please refer to\n the caveats document.", "Units": "dB", "ValidMin": "-1", "ValidMax": "80", "Support": { "SupportQuantity": "Other" } }, "Ant_B_Field_Angle": { "Name": "Antenna-B Field Total Angle", "ParameterKey": "Ant_B_Field_Angle", "Description": "Total angle between antenna used for WBD measurement and \nmeasured B field direction. Antenna refers to the antenna in use, either E or \nB. See ANTENNA variable.", "Units": "degrees", "ValidMin": "0.0", "ValidMax": "180.0", "Support": { "SupportQuantity": "Other" } }, "Ant_Xgse_Angle": { "Name": "Antenna Xgse Angle", "ParameterKey": "Ant_Xgse_Angle", "Description": "Total angle between the Xgse axis and the antenna direction. \nAntenna refers to the antenna in use, either E or B. See ANTENNA \nvariable.", "Units": "degrees", "ValidMin": "0.0", "ValidMax": "180.0", "Support": { "SupportQuantity": "Other" } }, "Ant_YZgse_Plane_Angle": { "Name": "Antenna YZgse-Plane Angle", "ParameterKey": "Ant_YZgse_Plane_Angle", "Description": " Total angle between Ygse axis and the projection of the antenna \ndirection in the Ygse-Zgse plane, measured counter-clockwise from +Ygse \n(angle=0 deg) to +Zgse (angle=90 deg), -Ygse (angle=180 deg) and -Zgse \n(angle=270 deg). Antenna refers to the antenna in use, either E or B. See \nANTENNA variable.", "Units": "degrees", "ValidMin": "0.0", "ValidMax": "360.0", "Support": { "SupportQuantity": "Other" } }, "DC_Offset": { "Name": "DC Offset", "ParameterKey": "DC_Offset", "Description": "DC Offset used when converting from raw digital values to \ncalibrated data. DC Offset values may be used to reverse calibrate the data \nto the original raw counts and to determine the boundaries of the original \ntransport packets.", "Support": { "SupportQuantity": "Temporal" } }, "WBD_Elec": { "Name": "WBD AC Electric Field", "ParameterKey": "WBD_Elec", "Description": "Calibrated AC WBD Electric Field. \n WARNING: If Translation is not equal \n to 0, this variable represents the \n electric field amplitude associated \n with the down-converted waveform. This\n affects the apparent frequency \n content of the electric field \n amplitude when plotted vs. time, as \n well as the frequency of the derived \n components when an FFT is applied to \n the electric field data. Refer to the \n WBD User Guide \n and calibration report in the CSA\n for more information.\n", "Units": "mV m^-1", "ValidMin": "-50.0", "ValidMax": "50.0", "Wave": { "WaveType": "PlasmaWaves", "WaveQuantity": "ACElectricField", "FrequencyRange": { "SpectralRange": "RadioFrequency", "Low": "25", "High": "577000", "Units": "Hz" } } }, "WBD_Mag": { "Name": "WBD AC Magnetic Field", "ParameterKey": "WBD_Mag", "Description": "Calibrated AC WBD Magnetic Field.", "Units": "nT", "ValidMin": "-10.0", "ValidMax": "10.0", "Wave": { "WaveType": "PlasmaWaves", "WaveQuantity": "ACMagneticField", "FrequencyRange": { "SpectralRange": "RadioFrequency", "Low": "25", "High": "577000", "Units": "Hz" } } }, "DATA_QUALITY": { "Name": "Data Quality", "ParameterKey": "DATA_QUALITY", "Description": "Data Quality: 0 = OK, 1 = clipped or questionable, 2 = bad data \npoint. Clipped data: Measurement was equal to raw data value maximum \n(255) or minimum (0). This does not necessarily mean the receiver was in \nsaturation, which would be accompanied by non-linear effects.", "Support": { "SupportQuantity": "Other" } }, "BM_Mode": { "Name": "BM_Mode", "ParameterKey": "BM_Mode", "Description": "BM_Mode\n(0=Duty Cycled 9.5 kHz, 1-in-3,\n 1 = Duty Cycled 9.5 kHz, 1-in-4, \n 2 = Duty Cycled 19 kHz, 1-in-3, \n 3 = Duty Cycled 19 kHz, 1-in-4, \n 4 = Duty Cycled 77 kHz, 1-in-3, \n 5 = Duty Cycled 77 kHz, 1-in-4, \n 6 = Digital Filtered 9.5 kHz, 1-in-3, roll-off at 3.2 kHz, \n 7 = Digital Filtered 9.5 kHz, 1-in-3, optimized roll-off at 4.2 kHz, \n 8 = Digital Filtered 9.5 kHz, 1-in-4, roll-off at 2.5 kHz, \n 9 = Digital Filtered 9.5 kHz, 1-in-4, optimized roll-off at 3.1 kHz)\n\n\n\t\t\t\t The following are the sampling rates\n for each of the 10 defined modes: \n Bandwidth Burst Mode Sample Rate\n --------- ---------- ------------ \n\t\t\t\t 9.5 kHz 0, 1 27.443 kHz\n\t\t\t\t 19.0 kHz 2, 3 54.886 kHz\n\t\t\t\t 77.0 kHz 4, 5 219.544 kHz \n\t\t\t\t 9.5 kHz 6, 7 9.148 kHz \n\t\t\t\t 9.5 kHz 8, 9 6.861 kHz \n", "Support": { "SupportQuantity": "Other" } } }, "Extension": "" } } } }