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NASA Space Science Data Coordinated Archive Header

JUNO JUPITER UVS 2 EXPERIMENT DATA RECORD V1.0 (PDS)

NSSDCA ID: PSPA-00607

Availability: Archived at NSSDC, accessible from elsewhere

Description

This description was generated automatically using input from the Planetary Data System.

Data Set Overview

The Juno Ultraviolet Spectrograph (UVS) CODMAC Level 2 Experiment Data Record is a collection of the far ultraviolet photon detections obtained by the UVS instrument, in raw form. As such, it constitutes the permanent record of the raw UVS data. These data include both the instrument science and housekeeping data, organized into extensions within files formatted according to the Flexible Image Transport System (FITS) standard, version 2.1b. The UVS EDR archive enables reprocessing of the raw science data as radiometric and geometric calibration processing routines improve. Investigators interested in applying advanced calibration methods or needing to understand the properties of the raw data will find the EDR products useful. Most investigators, however, will be interested in using either the UVS data products contained in the CODMAC Level 3 Reduced Data Record, as radiometric and geometric calibration processing has already been done for these products, or the UVS CODMAC Level 5 far ultraviolet map products.

Parameters

The fundamental measured parameters contained in the UVS EDR data set are the nearest time markers and the spatial and spectral locations on the UVS detector for each of the recorded far ultraviolet photon detection events. From these values raw calculated count rates (counts/sec) integrated over all spatial and spectral bins are also derived. The sampling interval for the derived count rate values is determined by the commanded rate at which the time markers are inserted into the data stream. This value will normally be set to 250 Hz.

Processing

UVS EDR data products will be generated at the UVS Science Operations Center (SOC), located at the Southwest Research Institute in San Antonio, Texas. The products will be generated by an automated pipeline process. The UVS instrument will nominally generate one to many housekeeping telemetry files and science data files per orbit. Once per day these UVS-generated files will be retrieved from the Juno spacecraft by the Juno Mission Operations Center (MOC) and then transferred by the MOC to the UVS SOC. The automated UVS SOC pipeline will ingest these files and invoke software to process them into EDR data product files. No calibration of the science data will be done at this time. Raw housekeeping telemetry values will be converted to engineering units, where applicable, and these converted values will be included in the EDR data product files.

Data

The UVS EDR data product file will contain the following types of data: 1. Spectral vs. Spatial Image: This is a reconstructed histogram generated from the pixel list data in the science data file. Photon acquisition events will be binned according to their spectral and spatial components. This summary image is used as a 'quick-look' check on data quality. [Extension 0 = primary FITS header and data unit (HDU)] 2. Spatial vs. Time Image: This is similar to the first dataset, but the data are binned based on spatial and temporal parameters. The 360 degree histogram will be split into 5 panels of 72 degree. A new histogram will be started every time the scan mirror moves, as determined from the housekeeping data. This summary image is used as a 'quick-look' check on data quality. [Extension 1] 3. Frame List: This dataset contains a list of the generated frame acquisitions. The list includes, for each frame, the instrument frame sequence number, start and stop times, tag bytes, quality factor and other instrument state information. The frame acquisition times and instrument state data contained in this list are used to cross-reference with the pixel list mode data for purposes of selecting data and checking timing consistency.[Extension 2] 4. Scan Mirror Data: This dataset contains a listing of all scan mirror positions and information on when the mirror entered and exited each position. These data are taken from the housekeeping packets. [Extension 3] 5. Raw Frame Data: This dataset contains all of the raw data from the science data file except for the file header. [Extension 4] 6. Analog Count Rate: This dataset contains a sequence of time ordered photon count rates read from the housekeeping data packets. [Extension 5] 7. Digital Count Rate: Similar to the previous dataset, this will contain the count rate as determined from the raw science data. These data will be shown as counts/second. [Extension 6] 8. Pulse Height Distribution (Lyman Alpha): This is one of three histograms where the bins are arranged as pulse height vs. time. One histogram will be created per spin. This histogram contains photons whose spectra are recorded on detector columns numbered between 850 and 930. [Extension 7] 9. Pulse Height Distribution (Stellar): This is one of three histograms where the bins are arranged as pulse height vs. time. One histogram will be created per spin. This histogram contains photons whose spectra are recorded on detector columns numbered between 931 and 1770. [Extension 8] 10. Pulse Height Distribution (Stim): This is one of three histograms where the bins are arranged as pulse height vs. time. One histogram will be created per spin. This histogram contains photons whose spectra are recorded on detector columns numbered between 0 - 149 and 1950 - 2047. [Extension 9] 11. Housekeeping Data: This dataset contains the complete housekeeping dataset, both in raw format and, where applicable, in calibrated engineering units. HK data are included here to assist with joint instrument and data quality trending analyses (foreseen and unforeseen). [Extension 10] 12. Parameter List: This table records the known values of the instrument parameter table, as reported in the housekeeping data. [Extension 11]

Ancillary Data

Ancillary data used in the generation of the UVS EDR data set include those values required to convert instrumental engineering quantities contained in the housekeeping data from raw values to physical units. These data have been obtained from the UVS engineers at the Southwest Research Institute in San Antonio, Texas.

Coordinate System

The UVS EDR data product is a CODMAC Level 2 product. As such, the science data contained therein have not been corrected for instrumental effects, calibrated, or located in space. The data are reported according to the two- dimensional detector coordinate system in X and Y (2048 x 256, respectively).

Software

Because the UVS EDR data product files adhere to version 2.1b of the FITS standard, all FITS readers up to this standard should be able to successfully read these files. There are many such FITS readers freely available in the public domain.

Media/Format

The UVS EDR data product files are written in FITS format, and the format of each file is described in an accompanying detached PDS label. The EDR archive itself will be electronically delivered from the Juno SOC (JSOC) to the PDS Imaging Node, where it will be made generally available via the World Wide Web.

These data are available on-line from the Planetary Data System (PDS) at:

http://pds-atmospheres.nmsu.edu/PDS/data/jnouvs_2001/

Alternate Names

  • JNO-J-UVS-2-EDR-V1.0

Discipline

  • Planetary Science: Atmospheres

Additional Information

Spacecraft

Experiments

Questions and comments about this data collection can be directed to: Dr. David R. Williams

 

Personnel

NameRoleOriginal AffiliationE-mail
Dr. G. Randy GladstoneData ProviderSouthwest Research Institutergladstone@swri.edu
Dr. Brad TranthamGeneral ContactSouthwest Research Institutebtrantham@swri.org
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