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Voyager 2 Planetary Radio Astronomy (PRA) Highband Receiver Jupiter encounter Spectrogram plots, 48 sec resolution
var authors='Warwick, James W.';
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(2025).
Voyager 2 Planetary Radio Astronomy (PRA) Highband Receiver Jupiter encounter Spectrogram plots, 48 sec resolution.
[Data set].
Goddard Space Flight Center.
https://doi.org/10.48322/wh7z-8756. Accessed on document.write(currentDateStr);.
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ResourceID
spase://NASA/DisplayData/Voyager2/PRA/Jupiter/High/P1D
Description
Spectrogram plots in GIF format derived from Voyager 2 Planetary Radio Astronomy (PRA) Highband receiver daily files during Jupiter Encounter (1979-06-01 to 1979-07-30). These plots are available for both polarization channels and in both color and grayscale. The color scale of these plots represent the electric field power spectral density in units of millibels. Across the top of each spectrogram in the spacecraft and instrument name, the name of the binary data file that was used to create this plot, the polarization channel (Left or Right) and the date in the format YYMMDD. The data set provides 48 second resolution highband radio mean power data in units of millibels. The high-band receiver consisted of 128 channels of 200 kHz bandwidth each, with center frequencies spaced at 307.2 kHz intervals from 1.2 MHz to 40.4 MHz. The highband receiver was designed especially for the observation of Jovian decametric radio emissions. The PRA radiometer was usually operated routinely in the so-called POLLO sweeping mode, in which all 198 frequency channels of the high- and low-band receivers together were swept in 6 sec, dwelling at each channel for 25 msec. From one step to the next in the channel switching sequence, the antenna polarization sense was reversed, i.e., was changed from RH to LH or vice versa. Thus the time required for making a measurement of both the RH and LH intensity components at both senses of elliptical polarization at a given frequency was 12 sec. The data consists of successive averages of 4 pairs of RH and LH intensity measurements, each average spanning an interval of 48 sec. The data are calibrated and are given in units of 'millibels' which is 1000 times the log of the received power. Zero millbels corresponds to approximately 1.4 x 10^-21 W m^-2 Hz^-1, however, this value is never seen in practice. The minimum values detected, which includes receiver internal and spacecraft generated noise, are about 2300 to 2400 millibels, or about 3.5 x 10^-19 W m^-2 Hz^-1; even higher values are seen at the very lowest frequencies. Note: The polarization indicated is the received polarization, not necessarily the emitted polarization. Correct interpretation of the received polarization depends on the antenna plane orientation relative to the radio source. A good description of this concept can be found in Leblanc Y., Aubier M. G., Ortega-Molina A., Lecacheux A., 1987, J.Geophys. Res. 92, 15125 and in Wang, L. and Carr, T.D., Recalibration of the Voyager PRA antenna for polarization sense measurement, Astron. Astrophys., 281, 945-954, 1994. and references therein.
Metadata Rights
CC0-1.0:
Creative Commons Zero v1.0 Universal
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Version:2.7.1
DisplayData
ResourceID
spase://NASA/DisplayData/Voyager2/PRA/Jupiter/High/P1D
NamingAuthority
NASA
ResourceType
DisplayData
ResourceHeader
ResourceName
Voyager 2 Planetary Radio Astronomy (PRA) Highband Receiver Jupiter encounter Spectrogram plots, 48 sec resolution
DOI
https://doi.org/10.48322/wh7z-8756
ReleaseDate
2026-02-26 20:49:02Z
RevisionHistory
RevisionEvent
ReleaseDate
2020-07-07 19:48:38Z
Note
Only known prior ReleaseDate of the metadata
RevisionEvent
ReleaseDate
2025-11-14 16:17:35Z
Note
Added PublicationInfo. Added ResourceType and NamingAuthority. Changed http to https in top-level schemaLocation attribute. Fixed version number separator in top-level schemaLocation attribute. Matched version number in schemaLocation attribute to updated value in Version tag. ZCB
RevisionEvent
ReleaseDate
2025-12-04 13:28:09Z
Note
Added MetadataRightsList and RightsList(s). Updated to 2.7.1. ZCB
RevisionEvent
ReleaseDate
2026-02-26 20:49:02Z
Note
Added DOI. tlk
Description
Spectrogram plots in GIF format derived from Voyager 2 Planetary Radio Astronomy (PRA) Highband receiver daily files during Jupiter Encounter (1979-06-01 to 1979-07-30). These plots are available for both polarization channels and in both color and grayscale. The color scale of these plots represent the electric field power spectral density in units of millibels. Across the top of each spectrogram in the spacecraft and instrument name, the name of the binary data file that was used to create this plot, the polarization channel (Left or Right) and the date in the format YYMMDD. The data set provides 48 second resolution highband radio mean power data in units of millibels. The high-band receiver consisted of 128 channels of 200 kHz bandwidth each, with center frequencies spaced at 307.2 kHz intervals from 1.2 MHz to 40.4 MHz. The highband receiver was designed especially for the observation of Jovian decametric radio emissions. The PRA radiometer was usually operated routinely in the so-called POLLO sweeping mode, in which all 198 frequency channels of the high- and low-band receivers together were swept in 6 sec, dwelling at each channel for 25 msec. From one step to the next in the channel switching sequence, the antenna polarization sense was reversed, i.e., was changed from RH to LH or vice versa. Thus the time required for making a measurement of both the RH and LH intensity components at both senses of elliptical polarization at a given frequency was 12 sec. The data consists of successive averages of 4 pairs of RH and LH intensity measurements, each average spanning an interval of 48 sec. The data are calibrated and are given in units of 'millibels' which is 1000 times the log of the received power. Zero millbels corresponds to approximately 1.4 x 10^-21 W m^-2 Hz^-1, however, this value is never seen in practice. The minimum values detected, which includes receiver internal and spacecraft generated noise, are about 2300 to 2400 millibels, or about 3.5 x 10^-19 W m^-2 Hz^-1; even higher values are seen at the very lowest frequencies. Note: The polarization indicated is the received polarization, not necessarily the emitted polarization. Correct interpretation of the received polarization depends on the antenna plane orientation relative to the radio source. A good description of this concept can be found in Leblanc Y., Aubier M. G., Ortega-Molina A., Lecacheux A., 1987, J.Geophys. Res. 92, 15125 and in Wang, L. and Carr, T.D., Recalibration of the Voyager PRA antenna for polarization sense measurement, Astron. Astrophys., 281, 945-954, 1994. and references therein.
Acknowledgement
When using delivered data please acknowledge the data provider.
PublicationInfo
Authors
Warwick, James W.
PublicationDate
2025-11-14 16:17:35Z
PublishedBy
Goddard Space Flight Center
Contacts
Role
Person
StartDate
StopDate
Note
1.
PrincipalInvestigator
spase://SMWG/Person/James.W.Warwick
InformationURL
Name
PPI/PDS PRA Instrument catalog file PRAINST.CAT
URL
https://pds-ppi.igpp.ucla.edu/ditdos/download?id=pds://PPI/VG_1601/CATALOG/PRAINST.CAT
Description
Information about the PRA instrument on the Voyager mission including operational mode descriptions.
InformationURL
Name
Planetary Radio Astronomy (PRA)
URL
https://nssdc.gsfc.nasa.gov/nmc/experiment/display.action?id=1977-076A-10
Description
NSSDC Master Catalog description of the Voyager 2 PRA Instrument
PriorIDs
spase://VWO/DisplayData/Voyager2/PRA/VG2_PRA_High_Jupiter_PT48S_GIF
spase://VWO/DisplayData/Voyager2/PRA/Jupiter/High.P1D
spase://VSPO/DisplayData/Voyager2/PRA/Jupiter/High/P1D
AccessInformation
RepositoryID
spase://SMWG/Repository/NASA/GSFC
Availability
Online
AccessRights
Open
RightsList
Rights
SchemeURI
https://spdx.org/licenses/
RightsIdentifierScheme
SPDX
RightsIdentifier
CC0-1.0
RightsURI
https://spdx.org/licenses/CC0-1.0.html
RightsName
Creative Commons Zero v1.0 Universal
Note
CC0 1.0 Universal is the Creative Commons license applicable to all publicly available NASA Heliophysics data products
AccessURL
Name
HTTPS from SPDF
URL
https://spdf.gsfc.nasa.gov/pub/data/voyager/voyager2/planet_radio_ast_pra/GIFs/
Language
en
Format
GIF
Encoding
None
Acknowledgement
When using delivered data please acknowledge the data provider.
InstrumentIDs
spase://SMWG/Instrument/Voyager2/PRA
MeasurementType
Waves.Passive
MeasurementType
Spectrum
MeasurementType
ElectricField
MeasurementType
MagneticField
TemporalDescription
TimeSpan
StartDate
1979-06-01 00:00:34Z
StopDate
1979-07-30 23:59:59Z
Cadence
PT48S
SpectralRange
RadioFrequency
DisplayCadence
PT24H
ObservedRegion
Jupiter
ObservedRegion
Heliosphere.Outer
Keywords
Dynamic Spectrogram
Spectrogram
Jupiter
Decametric Radio Emission
DAM
Parameter #1
Name
Spectral Power
Description
Electric field power spectral density, an average of 8 sweeps of the PRA highband receiver of 128 frequency channels each.
Units
millibels
Wave
WaveType
PlasmaWaves
WaveQuantity
ACElectricField
FrequencyRange
SpectralRange
RadioFrequency
Low
1.2
High
40.4
Units
MHz