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    • Voyager 1 Saturn Plasma Wave Spectrometer (PWS) Edited Spectrum Analyzer, Version 1.0, 4 s Data

    Metadata Updated: March 13, 2026

    • Data Set Overview\n =================\n\n Data Set Description\n ====================\n\nThis Data Set consists of 4 s edited, Wave Electric Field Intensities from the Voyager 1 Plasma Wave Receiver Spectrum Analyzer obtained in the Vicinity of the Kronian Magnetosphere. For each 4 s Interval, a Field Strength is determined for each of the sixteen Spectrum Analyzer Channels whose Center Frequencies range from 10 Hz to 56.2 kHz and which are logarithmically spaced in Frequency, four Channels per Decade. The Time associated with each Set of Intensities (sixteen Channels) is the Time of the Beginning of the Scan. During Data Gaps where complete 4 s Spectra are missing, no Entries exist in the File, that is, the Gaps are not Zero-filled or Tagged in any other way. When one or more Channels are missing within a Scan, the missing Measurements are Zero-filled. Data are edited but not calibrated. The Data Numbers in this Data Set can be plotted in raw Form for Event Searches and simple Trend Analysis since they are roughly proportional to the Log of the Electric Field Strength. Calibration Procedures and Tables are provided for use with this Data Set; the use of these is described below.\n\n Use of Voyager PWS Calibration Tables\n\nThe Voyager PWS Calibration Table is given in an ASCII Text File named SA_CL.TAB (for Voyager 1). This provides Information to convert the uncalibrated "Data Number" Output of the PWS sixteen-channel Spectrum Analyzer to calibrated Antenna Voltages for each Frequency Channel. Following is a brief Description of these Files and a Tutorial in their Application.\n\nDescriptive Headers have been removed from the Calibration Table File. The Columns included are IDN, ICHAN01, ICHAN02, ICHAN03, ICHAN04, ICHAN05, ICHAN06, ..., ICHAN16.\n\nThe first Column lists an uncalibrated Data Number followed by the corresponding Value in calibrated Volts for each of the sixteen Frequency Channels of the PWS Spectrum Analyzer. Each Line contains Calibrations for successive Data Number Values ranging from 0 through 255. (Data Number 0 actually represents the Lack of Data since the Baseline Noise Values for each Channel are all above that.)\n\nA Data Analysis Program may load the appropriate Table into a Data Structure and thus provide a simple Look-up Scheme to obtain the appropriate Voltage for a given Data Number and Frequency Channel. For example, the following VAX FORTRAN Code may be used to load a Calibration Array for Voyager 1 PWS:\n\n real4 cal(16,0:255)\n open(unit=10,file='SA_CL.TAB'status='old'\n\n do i=0,255\n read(10,) idn,(cal(ichan,i),ichan=1,16)\n end do\n\n close(10)\n\nThen, given an uncalibrated Data Value idn for the Frequency Channel ichan, the corresponding calibrated Antenna Voltage would be given by the following Array Reference:\n\n volts=cal(ichan,idn)\n\nThis may be converted to a Wave Electric Field Amplitude by dividing by the effective Antenna Length in meters, 7.07 m. That is:\n\n efield=cal(ichan,idn)/7.07\n\nSpectral Density Units may be obtained by dividing the Square of the Electric Field Value by the nominal Frequency Bandwidth of the corresponding Spectrum Analyzer Channel.\n\n specdens=(cal(ichan,idn)/7.07)^2/bandwidth(ichan)\n\nFinally, Power Flux may be obtained by dividing the Spectral Density by the Impedance of Free Space in Ohms:\n\n pwrflux=((cal(ichan,idn)/7.07)^2/bandwidth(ichan))/376.73\n\nOf course, for a particular Application, it may be more efficient to apply the above Conversions to the Calibration Table directly.\n\nThe Center Frequencies and Bandwidths of each PWS Spectrum Analyzer Channel for the Voyager 1 PWS are given below:\n\n Voyager 1 PWS Spectrum Analyzer\n ===============================\n\n+----------------------------------------+\n| Channel | Center Frequency | Bandwidth |\n------------------------------------------\n| 1 | 10.0 Hz | 2.16 Hz |\n| 2 | 17.8 Hz | 3.58 Hz |\n| 3 | 31.1 Hz | 4.50 Hz |\n| 4 | 56.2 Hz | 10.7 Hz |\n+----------------------------------------+

    Access & Use Information

    Public: This dataset is intended for public access and use. License: See this page for license information.

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    Dates

    Metadata Created Date March 13, 2026
    Metadata Updated Date March 13, 2026

    Metadata Source

    Harvested from NASA Data.json

    Other Data Resources

    Additional Metadata

    Resource Type Dataset
    Metadata Created Date March 13, 2026
    Metadata Updated Date March 13, 2026
    Publisher PDS PPI
    Maintainer
    Identifier /SDE/SPASE_JSON/|5f37aa38cf6da3367b1592a4155d84df
    Data Last Modified 2026-03-09
    Category Heliophysics
    Public Access Level public
    Bureau Code 026:00
    Metadata Context https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
    Schema Version https://project-open-data.cio.gov/v1.1/schema
    Catalog Describedby https://project-open-data.cio.gov/v1.1/schema/catalog.json
    Harvest Object Id 66cc8fb6-681d-4d81-bd9c-ec2a41b56f6f
    Harvest Source Id 58f92550-7a01-4f00-b1b2-8dc953bd598f
    Harvest Source Title NASA Data.json
    License https://www.usa.gov/government-works
    Program Code 026:000
    Source Datajson Identifier True
    Source Hash bbe0249ab01c62f9a9862b07701704ff14b9c4cea68ae3c7c42554d5877a169d
    Source Schema Version 1.1

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