2.2.2 spase://VWO/NumericalData/POLAR/PWI/WBR.PT0.000004016S Polar Plasma Wave Instrument, Wideband Receiver (WBR) 4.016 microsecond resolution 2012-11-14T00:00:00Z PWI>Plasma Wave Instrument Reference: Gurnett, D.A. et al, The Polar Plasma Wave Instrument, Space Science Reviews, Vol. 71, pp. 597-622, 1995. donald-gurnett@uiowa.edu An FFT on 1992 values was used in calibrating the data; i.e., perform FFT, calibrate in frequency domain, perform inverse FFT to get calibrated time series. Coordinate system used: antenna coordinate system, where the u-axis is offset by -45 degrees from the spacecraft x-axis, the v-axis is offset by -45 degrees from the spacecraft y-axis, and the z-axis is identical to the spacecraft z-axis. The effective noise bandwidth is the data sampling frequency divided by the size of the FFT (number of input samples) multiplied by 1.5 to to correct for the effects of a Hanning window applied to the time- domain samples. Hence, the effective noise bandwidth is 1.5 * delta_f. These data come in snapshots of 1992 or 3984 points every 0.064 seconds. Duration of a snapshot is less when the instrument is in duty cycle modes. Since Epoch time is in milliseconds, the times for the data points will not be unique unless the fmsec (fraction of milliseconds) is appended to the Epoch0 time for that point. The frequency filters used for the wideband receiver have a range that limits the calibration. The following table specifies the range of frequencies for which the calibration is certified. Outside this range the amplitude values may be in error and should not be used. +------------------------------------------------+ |Translation| Filter| | Freq Range| |------------------------------------------------| | 0 kHz| 90 kHz| | 7.5 kHz- 90.0 kHz| | 125 kHz| 90 kHz| | 131.9 kHz-214.8 kHz| | 250 kHz| 90 kHz| | 254.3 kHz-341.2 kHz| | 500 kHz| 90 kHz| | 504.79 kHz-591.1 kHz| | 0 kHz| 10 kHz| | 0.035 kHz- 11.64 kHz| | 0 kHz| 22 kHz| | 0.065 kHz- 21.59 kHz| | 0 kHz| 1-3 kHz| | 1.0 kHz- 3.0 kHz| | 0 kHz| 3-6 kHz| | 3.0 kHz- 6.0 kHz| +------------------------------------------------+ The cadence value given here is computed from the inverse of the sampling rate (249 kHz). For a description of the PWI receivers and the different operational modes see: http://www-pw.physics.uiowa.edu/plasma-wave/istp/polar/modes.html UIowa, Donald A. Gurnett spase://SMWG/Person/Donald.A.Gurnett PrincipalInvestigator spase://SMWG/Person/J.Douglas.Menietti Scientist spase://SMWG/Person/Jeremy.Faden MetadataContact Polar Plasma Wave Investigation (PWI) Data and User's Guides http://www-pw.physics.uiowa.edu/polar/data.html A Polar PWI page is maintained at the University of Iowa with descriptions of receivers, interpretation issues, user's guides, data availability tables, a form for creating summary plots and access to pregenerated dynamic spectrograms. en spase://SMWG/Repository/UIowa/RadioPlasmaWaveGroup Online Open POLAR PWI H9 data web access http://www-pw.physics.uiowa.edu/polar/po_h9_pwi/ HTTP access to directories with Polar PWI H9 data files CDF None UIowa, Donald A. Gurnett spase://SMWG/Repository/NASA/GSFC/SPDF Online Open FTP access to files at SPDF ftp://spdf.gsfc.nasa.gov/pub/data/polar/pwi/pwi_h9/ PO_H9_PWI In CDF via FTP from SPDF HTTP access to files at SPDF http://spdf.gsfc.nasa.gov/pub/data/polar/pwi/pwi_h9/ In CDF via HTTP from SPDF CDF None UIowa, Donald. A. Gurnett and the Space Physics Data Facility at NASA/GSFC spase://SMWG/Repository/NASA/GSFC/SPDF Online Open CDAWeb http://cdaweb.gsfc.nasa.gov/sp_phys/ PO_H9_PWI Plots, lists and files from CDAWeb of the data resource:PO_H9_PWI Text spase://SMWG/Instrument/POLAR/PWI Waves.Passive 1996-03-25T10:00:00.000Z 1997-09-17T00:00:00.000Z The cadence value given here is computed from the inverse of the sampling rate (249 kHz). PT0.000004016S CDF Global Attribute TITLE: Polar PWI WBR CDF Global Attribute MISSION_GROUP: Polar CDF Global Attribute MISSION_GROUP: Polar CDF Global Attribute PROJECT: ISTP>International Solar-Terrestrial Physics CDF Global Attribute DATA_VERSION: 1 CDF Global Attribute DISCIPLINE: Space Physics>Magnetospheric Science CDF Global Attribute DATA_TYPE: H9>High Resolution Data CDF Global Attribute ADID_REF: NSSD2001 CDF Global Attribute MODS: Created Jan 2004 Auroral hiss Chorus Auroral kilometric radiation Continuum radiation Equatorial Noise Plasmaspheric Hiss Langmuir Waves Electostatic Solitary Waves ESW Whistlers Ion Acoustic Waves Bernstein Waves Upper Hybrid Waves Lower Hybrid Waves Time Epoch Time, begin time of WBR snapshot ms Epoch 1996-02-27T00:00:00.000Z 2008-04-17T00:00:00.000Z Temporal Gain1 (WBR) This parameter is in the set of parameters that depends on the CDF column with the Parameter Key, EPOCH, to specify the Time of Observation. Gain1 Gain for WBR values 1-996 of 1992 or 1-1992 of 3984 dB Gain1 (WBR) I2 0 75 -1 Other Gain2 (WBR) This parameter is in the set of parameters that depends on the CDF column with the Parameter Key, EPOCH, to specify the Time of Observation. Gain2 Gain for WBR values 997-1992 of 1992 or 1993-3984 of 3984 dB WBR_Gain2 I2 0 75 -1 Other WBR Elec. Field This parameter is in the set of parameters that depends on the CDF column with the Parameter Key, EPOCH, to specify the Time of Observation. EPOCH Catalog Description (CATDESC): WBR Elec field spectral density measured on Eu or Ev antennas. WBR_Elec WBR Elec. Field mV/M WBR_Elec E12.4 -10.0 10.0 -1.0e+31 PlasmaWaves ACElectricField WBR Mag. Field This parameter is in the set of parameters that depends on the CDF column with the Parameter Key, EPOCH, to specify the Time of Observation. EPOCH Catalog Description (CATDESC): WBR magnetic field spectral density measured on magnetic loop or Bu search coil antennas. WBR_Mag WBR Mag. Field nT WBR_Mag E12.4 -10 10.0 -1.0e+31 PlasmaWaves ACMagneticField RadioFrequency 35 591100 Hz DATA_QUALITY This parameter is in the set of parameters that depends on the CDF column with the Parameter Key, EPOCH, to specify the Time of Observation. EPOCH Catalog Description (CATDESC): Data Quality for Ex components (0 = OK, 1 = clipped or questionable). DATA_QUALITY Data Quality: 0 = OK, 1 = clipped or questionable (0=OK) DATA_QUALITY I2 0 1 -1 Other