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Data Access
PDS/PPI
Voyager 2 Jupiter Plasma Wave Spectrometer (PWS) Edited Spectrum Analyzer, Version 1.1, 4 s Data
var authors='Decker, Robert B.; Krimigis, Stamatios M.';
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(2026).
Voyager 2 Jupiter Plasma Wave Spectrometer (PWS) Edited Spectrum Analyzer, Version 1.1, 4 s Data.
[Data set].
Space Physics Data Facility; Planetary Data System.
https://doi.org/10.48322/wq9x-m219. Accessed on document.write(currentDateStr);.
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ResourceID
spase://NASA/NumericalData/Voyager2/PWS/Jupiter/PT4S
Description
* Data Set Overview
* =================
* Version 1.1
* ===========
This Version 1.1 Data Set replaces the Version 1.0 Data Set (DATA_SET_ID=VG2-J-PWS-2-SA-4.0SEC) previously archived with the PDS. Changes to this Version include the Upgrade of the associated Labels and Templates to PDS Version 3 Compliance.
* Data Set Description
* ====================
This Data Set consists of 4 s edited, Wave Electric Field Intensities from the Voyager 2 Plasma Wave Receiver Spectrum Analyzer obtained in the Vicinity of the Jovian 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.
* Use of Voyager PWS Calibration Tables
* =====================================
The Voyager PWS Calibration Table is given in an ASCII Text File named SA_CL_4S.TAB (for Voyager 2). 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.
Descriptive Headers have been removed from the Calibration Table File. The Columns included are IDN, ICHAN01, ICHAN02, ICHAN03, ICHAN04, ICHAN05, ICHAN06, ..., ICHAN16.
The 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.)
A 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 2 PWS:
* real*4 cal(16,0:255)
* open(unit=10,file='SA_CL_4S.TAB'status='old')
*
* do i=0,255
* read(10,*) idn,(cal(ichan,i),ichan=1,16)
* end do
*
* close(10)
Then, given an uncalibrated Data Value idn for the Frequency Channel ichan, the corresponding calibrated Antenna Voltage would be given by the following Array Reference:
* volts=cal(ichan,idn)
This may be converted to a Wave Electric Field Amplitude by dividing by the effective Antenna Length in meters, 7.07 m. That is:
* efield=cal(ichan,idn)/7.07
Spectral 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.
* specdens=(cal(ichan,idn)/7.07)^2/bandwidth(ichan)
Finally, Power Flux may be obtained by dividing the Spectral Density by the Impedance of Free Space in Ohms:
* pwrflux=((cal(ichan,idn)/7.07)^2/bandwidth(ichan))/376.73
Of course, for a particular Application, it may be more efficient to apply the above Conversions to the Calibration Table directly.
The Center Frequencies and Bandwidths of each PWS Spectrum Analyzer Channel for the Voyager 2 PWS are given below:
Voyager 2 PWS Spectrum Analyzer
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Version:2.7.1
NumericalData
ResourceID
spase://NASA/NumericalData/Voyager2/PWS/Jupiter/PT4S
NamingAuthority
NASA
ResourceType
NumericalData
ResourceHeader
ResourceName
Voyager 2 Jupiter Plasma Wave Spectrometer (PWS) Edited Spectrum Analyzer, Version 1.1, 4 s Data
DOI
https://doi.org/10.48322/wq9x-m219
ReleaseDate
2026-06-26 13:31:35Z
RevisionHistory
RevisionEvent
ReleaseDate
2020-07-07 21:16:00Z
Note
Only known prior ReleaseDate of the metadata
RevisionEvent
ReleaseDate
2025-12-04 13:32:42Z
Note
Added MetadataRightsList. Added ResourceType and NamingAuthority. Updated to 2.7.1. Changed http to https in top-level schemaLocation attribute. Fixed version number separator in top-level schemaLocation attribute. ZCB
RevisionEvent
ReleaseDate
2026-04-10 09:59:27Z
Note
Added new Contact(s). ZCB
RevisionEvent
ReleaseDate
2026-04-10 10:04:18Z
Note
Added PublicationInfo. ZCB
RevisionEvent
ReleaseDate
2026-06-12 19:17:33Z
Note
Added DOI. tlk
RevisionEvent
ReleaseDate
2026-06-26 13:31:35Z
Note
Add 'Z' to TemporalDescription:TimeSpan:StartDate, TemporalDescription:TimeSpan:StopDate. ZCB
Description
* Data Set Overview
* =================
* Version 1.1
* ===========
This Version 1.1 Data Set replaces the Version 1.0 Data Set (DATA_SET_ID=VG2-J-PWS-2-SA-4.0SEC) previously archived with the PDS. Changes to this Version include the Upgrade of the associated Labels and Templates to PDS Version 3 Compliance.
* Data Set Description
* ====================
This Data Set consists of 4 s edited, Wave Electric Field Intensities from the Voyager 2 Plasma Wave Receiver Spectrum Analyzer obtained in the Vicinity of the Jovian 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.
* Use of Voyager PWS Calibration Tables
* =====================================
The Voyager PWS Calibration Table is given in an ASCII Text File named SA_CL_4S.TAB (for Voyager 2). 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.
Descriptive Headers have been removed from the Calibration Table File. The Columns included are IDN, ICHAN01, ICHAN02, ICHAN03, ICHAN04, ICHAN05, ICHAN06, ..., ICHAN16.
The 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.)
A 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 2 PWS:
* real*4 cal(16,0:255)
* open(unit=10,file='SA_CL_4S.TAB'status='old')
*
* do i=0,255
* read(10,*) idn,(cal(ichan,i),ichan=1,16)
* end do
*
* close(10)
Then, given an uncalibrated Data Value idn for the Frequency Channel ichan, the corresponding calibrated Antenna Voltage would be given by the following Array Reference:
* volts=cal(ichan,idn)
This may be converted to a Wave Electric Field Amplitude by dividing by the effective Antenna Length in meters, 7.07 m. That is:
* efield=cal(ichan,idn)/7.07
Spectral 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.
* specdens=(cal(ichan,idn)/7.07)^2/bandwidth(ichan)
Finally, Power Flux may be obtained by dividing the Spectral Density by the Impedance of Free Space in Ohms:
* pwrflux=((cal(ichan,idn)/7.07)^2/bandwidth(ichan))/376.73
Of course, for a particular Application, it may be more efficient to apply the above Conversions to the Calibration Table directly.
The Center Frequencies and Bandwidths of each PWS Spectrum Analyzer Channel for the Voyager 2 PWS are given below:
Voyager 2 PWS Spectrum Analyzer
PublicationInfo
Authors
Decker, Robert B.; Krimigis, Stamatios M.
PublicationDate
2026-04-10 10:04:18Z
PublishedBy
Space Physics Data Facility; Planetary Data System
Contacts
Role
Person
StartDate
StopDate
Note
1.
CoPI
spase://SMWG/Person/Robert.B.Decker
2.
PrincipalInvestigator
spase://SMWG/Person/Stamatios.M.Krimigis
3.
MetadataContact
spase://SMWG/Person/Todd.A.King
4.
MetadataContact
spase://SMWG/Person/Lee.Frost.Bargatze
InformationURL
Name
VG2-J-PWS-2-RDR-SA-4.0SEC-V1.0
URL
https://pds-ppi.igpp.ucla.edu/data/VG2-J-PWS-2-RDR-SA-4.0SEC-V1.0/AAREADME.TXT
Description
The Document describing the Contents of the Collection.
Language
En
PriorIDs
spase://VMO/NumericalData/Voyager2/PWS/Jupiter/PT4.0S
spase://VSPO/NumericalData/Voyager2/PWS/Jupiter/PT4S
AccessInformation
RepositoryID
spase://SMWG/Repository/PDS/PPI
Availability
Online
AccessRights
Open
AccessURL
Name
PDS/PPI
URL
https://pds-ppi.igpp.ucla.edu/search/view/?f=yes&id=pds://PPI/VG2-J-PWS-2-RDR-SA-4.0SEC-V1.0
ProductKey
VG2-J-PWS-2-RDR-SA-4.0SEC-V1.0
Description
This Collection is archived with NASA Planetary Data System.
Language
En
Format
Text.ASCII
Acknowledgement
NASA Planetary Plasma Interactions (PPI) Node of the Planetary Data System (PDS) and the Principal Investigator for the Data.
InstrumentIDs
spase://SMWG/Instrument/Voyager2/PWS
MeasurementType
Waves.Passive
TemporalDescription
TimeSpan
StartDate
1979-07-02 00:00:03.36Z
StopDate
1979-08-03 23:59:57.14Z
Cadence
PT4S
ObservedRegion
Jupiter