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NASA Space Science Data Coordinated Archive Header



Availability: Archived at NSSDC, accessible from elsewhere

Time span: 1995-12-07 to 2003-09-21


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

Overview: ========= This data set contains raw data from the Plasma Science instrument (PLS) onboard the Galileo spacecraft during the Jupiter orbital operations phase (December 1995 to end of mission). These data have been edited, averaged, and reformatted from the raw telemetry packets into a simple ASCII tabular structure to display and analysis. Parameters: =========== This data set includes high time resolution (LPW) data recorded during targeted encounters Galileo moon encounters and selected magnetospheric survey itenrvals when telemetry was available. The basic data set parameters are the detector count rates in units of counts per second. Data are provided at the full instrument sampling rate in all sampling parameters (time, detector, E/Q, M/Q). The instrument has twenty (20) detectors (seven ion, seven electron, six mass spectrometer) and can sample E/Q or M/Q (mass spectrometer detectors only) in sixty-four (64) steps for each detector. Processing: =========== These data have been averaged from the PLS uncalibrated fullresolution data set (DATA_SET_ID = GO-J-PLS-3-RDR-FULLRES-V1.0). Please refer to the data set catalog file for a full description of the processing performed on that data set. The following is a description of the averaging performed on this data set. The uncalibrated counts have been averaged over all detectors available at each time step. The time is located at the center of the interval. In order to remove data gaps between the detectors, each energy channel has been fitted and with a cubic spline. To smooth the data over timesteps, a simple two point running average was used over all 64 energy channels in time. Finally, to smooth the data, an average was performed over a square consisting of nine unweighted points with the original data point being at the center of the square. For simplicity, and due to the similar values across the detectors in the E_STEP tables, only the values used in E_STEP_2.TAB were used in the plotting and ascii tables. Ancillary Data: =============== Spacecraft Events: xxx_SEF.TXT A time ordered file extracted from the As-Run Spacecraft Events Files (ARSEF) that provides the timing of events that are significant to the plasma experiment. These events include whether or not the instrument is 'on', which type of data are being acquired (RTS or LPW), the time of thruster firings, etc. The 'xxx' in the file name is the orbit name (i.e. G01 for orbit Ganymede 1). Coordinate System: ================== Data are provided in PLS instrument coordinates. Please refer to the instrument description paper [FRANKETAL1992] for a description of the instrument mounting, detector fields of view, and spin phase sectoring. See also the SECTOR.TAB file in the ancillary data files. Software: ========= There is no software provided with this archive. Media/Format: ============= These data are archived on either CDROM or DVDROM media. The data files are stored in a simple ASCII table form that is described by a detached PDS label (Table Object). Each table has the following structure: Col# Name Format Description --------------------------------------------------------------------1 UTC A21 Spacecraft event time (UTC) at the average center 2-65 Counts e10.2 Average count rates at 64 energy steps 66-129 Energy e10.2 Energy for count rate channel of same array index

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

Alternate Names



  • Planetary Science: Fields and Particles

Additional Information



Questions and comments about this data collection can be directed to: Dr. Edwin V. Bell, II



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