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Availability: Archived at NSSDC, accessible from elsewhere


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

Data Set Overview

The data set consists of calibrated observations, also known as CDRs. For all the CDR products there is a detached PDS label file that describes the contents of one data file. Each label file will have the same base name as the data file it is describing, with the extension .LBL to denote a label file. The label file defines the start time and end of the observation, product creation time, and the structure of the ASSCI tables. Each data product is identified within the PDS label by a STANDARD_DATA_PRODUCT_ID value, shown in parentheses in the table below.

Instrument Overview

The JEDI sensors consists of a 60-mm diameter, hockey puck-like cylinder, in which a start foil and stop foil, wrapped around opposite curved sides of the cylinder, constitute the TOF chamber. The detectors are arranged so that each detector senses the events within a given range of incidence angles. Each of the 6 detector modules is composed of 4 pixels: large and small ion and large and small electron. See the INSTRUMENT.CAT file for more information.

Calibration Overview

This data set is calibrated; it provides the instrument team's best available interpretation of the measured data at the time of release. This understanding is evolving and it is expected that the calibration process will change and improve with subsequent releases.


The timing parameters in the CDRs are identical to those in the EDRs. See JEDI_J_EDR_DS.CAT file for a short description or the JEDI SIS for more detailed information. In addition to the timing parameters and the uncalibrated counts, and calibrated counts per second and intensity spectra, for each data record in the CDR, we include ephemeris attitude and pitch angle information for the convenience of the end user. We also include a subset of the basic rate information so the end user can obtain an understanding of the level of activity in the instrument system as this will affect the instrument performance. The additional quantities are, in brief: <Ephemeris, Attitude, and Pitch Block>: Spacecraft Position - X, Y, and Z in the POS frame (POS = JSE for observations at Jupiter). Planetary Position - Latitude and Longitude in the LOC frame (LOC= IAU_JUPITER for observations at Jupiter). Look Direction - Unit Vector X, Y, and Z of the 'look direction' of the negative of the incident particle velocity vector for each telescope. Pitch Angle (1 column per telescope = 6 columns) - The angle between the incident particle velocity vector and the local magnetic field. <Basic Rate Block> which of these values are present depends on the data type, see JEDI SIS for details: SSD0-SSD5 - Number of pulses on the Solid State Energy detector for telescope number 0-5 VEP (Valid Events Processed) - Number of events actually processed by the flight software VEE (Valid Energy Events) - Total number of events in all SSD (Energy) detectors. Start0, Stop0 - Number of pulses on the end of the Start or Stop anode nearest to look direction 0. VTOFXE - Number of valid TOFxE events counted. VTOFXPH - Number of valid TOFxPH events counted. Data ==== The JUNO JEDI CDR data set products are the same as described in JEDI_J_EDR_DS.CAT.

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

Alternate Names

  • JNO-J-JED-3-CDR-V1.0


  • Planetary Science: Fields and Particles

Additional Information



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



NameRoleOriginal AffiliationE-mail
Dr. Barry H. MaukData ProviderApplied Physics Laboratory
Dr. Barry H. MaukGeneral ContactApplied Physics Laboratory
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