Bundle cassini-rpws-lp-continuous_current Version 1.0 Cassini Orbiter Radio and Plasma Wave Science Cassini RPWS Langmuir Probe Continuous Current Planetary Plasma Interactions Discipline Node of the Planetary Data System ============================================================================== Introduction ============================================================================== The Cassini Radio and Plasma Wave Science (RPWS) Langmuir Probe (LP) continuous current data set comprises calibrated probe current measurements acquired up to 20 Hz rate at fixed bias voltage during the entire Cassini mission. These currents can be used to infer high temporal resolution density fluctuations between standard Langmuir probe sweeps. If related to densities determined during a sweep prior to or following the 20 Hz data, or using other electron density estimates, the relative currents can be assigned absolute densities. Data are presented in text tables and are organized so as to have fixed-length records for ease in data handling. Note the disclaimer below. Users of these data are encouraged to acknowledge both the PDS and the principle investigators of the instruments whose data are used in analysis in all publications. ============================================================================== Related PDS Products ============================================================================== Related Cassini RPWS LP data bundles include: cassini-rpws-lp-ne_proxy Electron density derived from the probe floating potential and an empirical relation with the Cassini Plasma Spectrometer (CAPS) data cassini-rpws-lp-sweep Thermal plasma parameters derived from Langmuir probe voltage sweeps acquired in the inner magnetosphere and near moon encounters cassini-rpws-lp-voltage_current Calibrated but uninterpreted Langmuir probe voltage-current characteristics aquired almost continuously during the entire mission ============================================================================== File Formats ============================================================================== The data files in this bundle are all ASCII text. All data files are described by PDS labels following PDS4 specifications. The extensible markup language label files for the data have the same name as the data files they describe, but with the extension "xml". Each label file is in the same directory as the file it describes. All plain text documents and data 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, and UNIX/Linux operating systems. UNIX/Linux system users may see an unnecessary carriage return character (^M) at the end of each line. PDS label files however follow the common XML practice of using lines terminated with a line feed character (ASCII 10) only. The primary data products are contained in daily text files with three columns including time, set probe potential in volts, and measured current in amps. These ASCII TAB files are formatted with fixed-length records and fixed-width columns separated by a comma for ease of use. The ASCII xml label files contain descriptions of the fields of each data file in extensible markup language format. In this bundle, all data files share the same format. More information on the PDS4 labels used in this bundle can be found at: https://pds.nasa.gov/datastandards/documents/ ============================================================================== Bundle Contents and Structure ============================================================================== [cassini-rpws-lp-continuous_current] Root directory | |- bundle.lblx PDS4 label file describing the bundle as a whole |- readme_1.0.txt Plain text describing bundle contents, organization, | and use (this file) | |- [data] Contains primary collection for this bundle | | | |- collection_data.lblx PDS4 label describing the data collection | |- collection_data.csv List of items in the data collection | | | |- [yyyy] Subdirectories for each year of data files | | | |- RPWS_LP_CNTCUR_yyyyddd_Vv.lblx PDS4 label describing an | | individual data file with yyyyddd the year and day of | | year and v the version number of the file | |- RPWS_LP_CNTCUR_yyyyddd_Vv.TAB The data files comprising the | primary archive products. Each file contains all | available data for the given day. | |- [document] Documents that are useful for understanding | the data in this bundle. | |- data-desc.lblx PDS4 label describing data set description file below. |- data-desc.md Markdown (text) file containing a description of the | data that comprise this bundle. |- errata.lblx PDS4 label describing the errata file below. |- errata.md Markdown (text) file containing a list of known errata | associated with this bundle. ============================================================================== Contacts ============================================================================== At the time this archive was produced the PDS/PPI operator manager was Mr. Steven Joy, sjoy@igpp.ucla.edu. The Cassini RPWS PI was Dr. William Kurth, william-kurth@uiowa.edu. The best first point of contact for issues related to this archive is: Internet pds_operator@igpp.ucla.edu Or, for more general PDS information: Internet pds_operator@jpl.nasa.gov ============================================================================== Disclaimer ============================================================================== The PDS and the Planetary Plasma Interactions (PPI) Node in particular, assume no legal liability for errors in this archive. All users are encouraged to verify the "correctness" of the data prior to submitting any publications or other work based on these data. Any discovered errors should be reported back to the PPI Node of the PDS. ============================================================================== Acknowledgements ============================================================================== These data were collected under the auspices of the Cassini Project. Donald A. Gurnett and William S. Kurth were the Radio and Plasma Wave Science Principal Investigators. Jan-Erik Whalund was the instrument lead for the Langmuir probe. The archiving effort at The University of Iowa was supported by L. Granroth and C. Piker. This archiving effort was supported by the Planetary Plasma Interactions Node of the Planetary Data System. Assistance was provided J. Mafi and D. Kazden of the University of California, Los Angeles. ==============================================================================