The GOPW_2001 volume contains all available plasma electron number densities derived from observations by Galileo PWS (Plasma Wave Science). Data provided on this volume are at the highest available time and frequency resolution and have been calibrated into physical units.
Every effort has been made to assure that the data and documentation are of the best possible quality given the time and resources available. However, revisions to this volume are likely. The PPI Node of the PDS will maintain an online list of ERRATA where errors and updates are documented. Should any user of this product find an error on this volume or deficiency in its documentation, please check to see if the issue has been corrected in a revised release of this volume. If not, report the issue to the PPI Node so that the finding may be brought to the attention of the archive producers.
This volume, GOPW_2001, contains derived data records from the Galileo PWS after arrival at Jupiter and continuing through the end of the mission, 1996-05-25 through 2003-09-21. This data set is known to be incomplete at this time and will be updated as new data are available. This release, version 01_PREVIEW, was published on 2017-03-17. For archive users unfamiliar with the process by which plasma density measurements may be derived from low frequency radio spectra, the documents RICHARDS_2006.PDF and ANSHER_2001.PDF have been provided in the DOCUMENTS folder of this volume. Furthermore, the illustration RELATIVE_DENSITIES.PNG provides an overview of relative plasma densities as a function of radial distance from Jupiter.
These data were derived from the low rate science (LRS) survey products from the Galileo PWS instrument which have been published under the data set identifier,
GO-J-PWS-2-REDR-RTS-SA-FULL-V1.0
which was released on volume GO_0068.
Furthermore, the magnitude of the magnetic field determines many of the characteristic plasma frequencies included within these data. Thus the magnetometer data set,
GO-J-MAG-3-RDR-MAGSPHERIC-SURVEY-V1.0
which was released on volume GOMAG_9002 is a natural companion to this volume.
The data files on this volume are ASCII text and binary files. Browse data are provided in Portable Network Graphics (PNG) format. All data files are described by detached PDS labels. A detached label file has the same name as the data file that it describes, but with the extension .LBL. For example, the file ED_1996_06_23_V01.CSV is accompanied by the detached label file ED_1996_06_23_V01.LBL in the same directory. File names within this archive comply with the "27.3" convention for compliance with ISO 9660 Level 2 interchange requirements.
All data files, detached PDS labels, and descriptive text files are stream format files, with a carriage return (ASCII 13) and a line feed character (ASCII 10) at the end of the record. This allows the files to be read by MacOS, DOS, Windows, UNIX, and VMS operating systems. UNIX system users may see an unnecessary carriage return character (^M) at the end of each line. Mac users may see an unnecessary line feed character (^J) at the start of each line.
The primary data products in this volume are formatted as PDS SPREADSHEET objects contained in ASCII comma separated value files (.CSV). These are formatted so that they may be read directly into many database management systems (DBMS) or spreadsheet programs on various computers. Scientific analysis packages typically include routines for reading standards-conforming CSV files. Records contain a fixed number of variable-length fields delimited by commas, with records terminated with carriage-return line-feed pairs. Strings are enclosed in double quotes and missing data may result in adjacent commas.
The document, PDS label, and CSV data files on this volume can be viewed with a Web browser. Note that to view these files, the browser may need to be configured to recognize files with extensions of .CAT, .LBL, and .CSV as text files. Users with Web browsers also can navigate the disk via the HTML file AAREADME.HTM in the disk's root directory and the HTML files in the BROWSE directory.
PDS labels are object-oriented. The object to which the label refers (e.g., SERIES, TABLE, etc.) is denoted by a statement of the form:
^object = location
in which the caret character (^, also called a pointer in this context) indicates that the object starts at the given location. For an object in the same file as the label, the location is an integer representing the starting record number or byte of the object (the first record/byte in the file is 1). For an object located outside the label file, the location denotes the name of the file containing the object, along with the starting record or byte number. For example:
^SPREADSHEET = ("ED_1996_06_23_V01.CSV", 589<BYTES>)
indicates that the SPREADSHEET object begins at byte 589 of the file ED_1996_06_23_V01.CSV in the same directory as the detached label file. Below is a list of the possible formats that use the ^object keyword.
^object = n ^object = n<BYTES> ^object = ("filename.ext",n) ^object = ("filename.ext",n<BYTES>)where n is the starting record or byte number of the object, counting from the beginning of the file (record 1, byte 1); default is record number. <BYTES> indicates that number given is in units of bytes. filename upper-case file name. ext upper-case file extension.
There is a file called ERRATA.TXT found at the root level of this volume which contains a list of known deficiencies or caveats associated with data on this volume at the time it was published.
If you find an error on this disk, please report the error to the PDS Operator at the PPI Node of the PDS.
Internet pds_operator@igpp.ucla.edu
Telephone (310) 206-6073
U.S. Mail PDS Operator
c/o Dr. Raymond Walker
UCLA - IGPP
Los Angeles, CA 90095-1567
Only through support and feedback of the users of these data can an effective errata list be maintained.
This section describes the volume structure and naming conventions. Below is a tree diagram of the volume, followed by a description of the directory function and key files in each directory.
[GOPW_2001] (root directory) | |- AAREADME.TXT Plain text describing volume contents, | organization, and use (this file) | |- ERRATA.TXT Describes known deficiencies or caveats in the | data on this volume. | |- VOLDESC.CAT High level description of volume contents. | |- [BROWSE] Contains browse plots depicting the data. | | | |- [nn_target] Directories containing browse plots for an entire | orbit where "nn" indicates the orbit number and | "target" indicates the primary mission target. | These range from 00_JUPITER through 34_JUPITER. | |- [CATALOG] Information on data sets and how they are | processed and produced, on Galileo spacecraft | and mission, on PWS instrument, on cognizant | personnel, and on references to various | related documents. | |- [DATA] Contains CSV files of derived electron plasma | | frequency and associated electron number density, | | along with related measurements, such as electron | | cyclotron frequency, trajectory coordinates, and | | data quality flags, constituting the primary archive | | products. | | | |- [nn_target] Directories containing CSV data files and detached | labels describing those files for an entire orbit | where "nn" indicates the orbit number and "target" | indicates the primary mission target. These range | from 00_JUPITER through 34_JUPITER. | |- [DOCUMENT] Two masters thesis papers describing the methods | used to produce this derived data set. | | |- [INDEX] Volume and cumulative indices of archive products.
People directly responsible for the construction and release of this archive volume include Steven Joy and Joe Mafi of the UCLA PDS/PPI Node, both experts in technical archive details. Science expertise is also provided by Dr. William Kurth, Galileo PWS and PDS/PPI co-investigator, and Dr. Raymond Walker, PDS/PPI Node manager.
For questions or problems regarding this volume, please contact the PDS/PPI operator:
Internet pds_operator@igpp.ucla.edu
Telephone (310) 206-6073
U.S. Mail PDS Operator
c/o Dr. Raymond Walker
3845 Slichter Hall
UCLA - IGPP
Los Angeles, CA 90095-1567
For questions regarding PDS Standards or other archive volumes available from the PDS, please contact PDS Operator at the PDS Central Node (at JPL):
Internet pds_operator@jpl.nasa.gov
U.S. Mail Planetary Data System, PDS Operator
Jet Propulsion Laboratory
Mail Stop 202-101
4800 Oak Grove Dr.
Pasadena, CA 91109-8099
The PDS and the Planetary Plasma Interactions (PPI) Node in particular, assume no legal liability for errors on this disk. All users are encouraged to verify the "correctness" of the data prior to submitting any publications or other work based on these data. Errors on this disk should be reported back to the PPI Node of the PDS through the ERRATA reporting procedures described above.
These data were collected under the auspices of the Galileo Project. Donald A. Gurnett was the Plasma Wave Science Principal Investigator. Much of the cutoff and resonance tracing was undertaken by a cadre of undergraduate workers overseen by Jay Ansher. Brad Barnhardt continued the frequency tracing, and, along with Jay Ansher and Ben Richards, organized and verified the derived products. The archiving effort at The University of Iowa was supported by Chris Piker, Joseph Groene, and Jeremy Faden.
This archiving effort was supported by the Planetary Plasma Interactions Node of the Planetary Data System, with particular assistance provided by Joe Mafi. Special thanks to the reviewers, including Krishan Khurana, Patrick Canu, Richard Chen, and Marissa Vogt.