Data Access
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.
Version:2.6.0
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.
| Role | Person | StartDate | StopDate | Note | |
|---|---|---|---|---|---|
| 1. | PrincipalInvestigator | spase://SMWG/Person/William.S.Kurth | |||
| 2. | MetadataContact DataProducer | spase://SMWG/Person/Larry.J.Granroth | |||
| 3. | Developer DataProducer | spase://SMWG/Person/Chris.W.Piker | |||
| 4. | MetadataContact | spase://SMWG/Person/Lee.Frost.Bargatze |
Voyager Plasma Wave Subsystem primary team web page, including data access links
Access to Voyager 1 PWS waveform data from the PI web site
In CDF via ftp from SPDF
In CDF via http from SPDF
Access to ASCII, CDF, and plots via NASA/GSFC CDAWeb
Web Service to this product using the HAPI interface
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.
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.
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.
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.
Number of microseconds to add to Epoch time to get sample time (time of an individual 4-bit sample).
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.