Version:2.6.0
NumericalData
ResourceID
spase://NASA/NumericalData/Voyager1/PWS/Waveform-CDF/PT0.00003472S
ResourceHeader
ResourceName
Voyager 1 PWS electric field waveform in CDF files
DOI
https://doi.org/10.17189/g5fy-rz59
ReleaseDate
2022-09-29 12:34:56.789
RevisionHistory
RevisionEvent
ReleaseDate
2022-09-29 12:34:56.789
Note
Initial release of metadata submitted by LJG on 20220721, added Acknowledgement, PublicationInformation, and updated two AccessURL URLs, reviewed by LFB 20220929
RevisionEvent
ReleaseDate
2023-09-21 12:34:56.789
Note
Updated AccessInformation for CDAWeb, added AccessInformation for HAPI, versioned up to SPASE 2.6.0, LFB 20230921
Description
The Voyager 1 Plasma Wave Subsystem (PWS) electric field waveform data set contains all available uncalibrated full resolution 4-bit measurements for the entire mission. The PWS waveform receiver samples the voltage on the 10 m electric antennas at the rate of 28800 samples per second through a 40 Hz to 12 kHz bandpass filter, utilizing an automatic gain control. However, gain information is not returned in telemetry so absolute calibration cannot be done directly. The waveform may be used to identify features such as dust impacts in the time domain or a power spectrum may be derived to show relative amplitudes of spectral elements in the frequency domain.
Acknowledgement
W.S. Kurth, L.J. Granroth, C.W. Piker, DOI 10.17189/g5fy-rz59
Contacts
InformationURL
Name
Voyager PWS team web page
URL
Description
Voyager Plasma Wave Subsystem primary team web page, including data access links
AccessInformation
RepositoryID
AccessURL
Name
Voyager 1 PWS waveform data
URL
Description
Access to Voyager 1 PWS waveform data from the PI web site
Format
CDF
AccessInformation
RepositoryID
AccessURL
Format
CDF
AccessInformation
RepositoryID
Availability
Online
AccessRights
Open
AccessURL
Name
FTPS from SPDF (not with most browsers)
URL
Description
In CDF via ftp from SPDF
AccessURL
Name
HTTPS from SPDF
URL
Description
In CDF via http from SPDF
AccessURL
Name
CDAWeb
URL
ProductKey
VG1_PWS_WF
Description
Access to ASCII, CDF, and plots via NASA/GSFC CDAWeb
Format
CDF
Encoding
None
AccessDirectoryTemplate
https://cdaweb.gsfc.nasa.gov/pub/data/voyager/voyager1/wave_spectra_pws/waveform_cdf/$Y
AccessFilenameTemplate
vg1_pws_wf_$Y$m$d$H_$v.cdf
Acknowledgement
Please acknowledge W.S. Kurth, L.J. Granroth, and C.W. Piker. Also please acknowledge the data providers and CDAWeb when using these data.
AccessInformation
RepositoryID
Availability
Online
AccessRights
Open
AccessURL
Name
CDAWeb Programmatic Data Access
URL
Style
WebService
ProductKey
VG1_PWS_WF
Description
Access to this data from common programming environments. Note: this AccessInformation element was added by HDPWS.
Format
Binary
Acknowledgement
Please acknowledge W.S. Kurth, L.J. Granroth, and C.W. Piker. Also please acknowledge the data providers and CDAWeb when using these data.
AccessInformation
RepositoryID
Availability
Online
AccessRights
Open
AccessURL
Name
CDAWeb HAPI Server
URL
Style
HAPI
ProductKey
VG1_PWS_WF
Description
Web Service to this product using the HAPI interface
Format
CSV
Acknowledgement
Please acknowledge W.S. Kurth, L.J. Granroth, and C.W. Piker. Also please acknowledge the data providers and CDAWeb when using these data.
ProcessingLevel
Uncalibrated
InstrumentIDs
MeasurementType
Waves
TemporalDescription
TimeSpan
StartDate
1978-08-21 05:41:36.300Z
RelativeStopDate
-P90D
Cadence
PT0.00003472S
Parameter #1
Name
Epoch Time
ParameterKey
epoch
Description
Epoch Time, Spacecraft Event Time at the beginning of a SCLK line of 1600 contiguous 4-bit samples. Samples occur at 28800 per second, but lines occur once every 60 ms, with 128 missing samples between lines. Epoch Time is the number of nanoseconds since the J2000 Epoch, 2000-01-01T11:58:55.816 UTC.
Cadence
PT0.06S
Units
ns
UnitsConversion
1.0e-9s
RenderingHints
AxisLabel
Time
ScaleType
LinearScale
Support
Parameter #2
Name
Part
Description
This is the spacecraft clock partition number. The Voyager Flight Data System Counter (FDSC) is the spacecraft clock (SCLK), consisting of a modulo 65536 (16-bit) counter that advances once every 48 minutes, a modulo 60 counter that advances once every 48 seconds, and a line counter that counts from 1 through 800 for each 48 second frame, incrementing every 60 ms. To account for natural rollovers or commanded resets of the FDSC, the partition number indicates the SCLK interval.
Caveats
The FDSC (SCLK) rate varies slightly due primarily to environmental conditions. Cadences given here have some variability and accurate mapping of SCLK to SCET requires a SPICE clock kernel calculation. The SCLK partition cadence is the nominal cycle time of the 16-bit counter advancing once per 48 minutes, or 65536*48 minutes.
Cadence
PT3145728M
Support
Parameter #3
Name
SCLK
Description
This is a text representation of the spacecraft clock (FDSC, SCLK) at the beginning of a contiguous line of 1600 4-bit samples. The format is mmmmm:nn:lll, where mmmmm is the modulo 65536 counter that advances (nominally) once every 48 minutes, nn is the modulo 60 counter that advances once every 48 seconds, and lll is the line counter that cycles from 1 through 800, advancing every 60 ms.
Cadence
PT0.06S
Support
Parameter #4
Name
ERT
Description
Earth Received Time of the line of Voyager PWS waveform data. Value is nanoseconds since the J2000 epoch, 2000-01-01T11:58:55.816 UTC.
Support
Parameter #5
Name
timeOffsets
Description
Number of microseconds to add to Epoch time to get sample time (time of an individual 4-bit sample).
Support
Parameter #6
Name
Waveform
Description
A contiguous set of 1600 uncalibrated 4-bit samples converted to signed bytes (raw * 2 - 15) so they range from -15 to +15 and are proportional to voltage at the antenna inputs. An automatic gain control is employed, but the gain value is not known, so direct calibration is not possible.
Wave
WaveType
PlasmaWaves
Qualifier
Magnitude
WaveQuantity
ACElectricField
WavelengthRange
Low
28
High
12000
Units
Hz