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Availability: Archived at NSSDC, accessible from elsewhere

Time span: 1992-12-08 to 1992-12-08


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

This data set contains sixteen sector rate data for the energetic particle detector obtained from the LEMMS and CMS telescopes during the time of significant activity during the Earth encounter on day 343, 1992. A data file record contains a single sector's data for a particular LEMMS or CMS channel. Also included are pitch and phase angles of the particles counted by the detectors. Data Set Overview ================= The angles are determined in a coordinate system defined by the magnetic field (magnetic field data provided by Steve Joy) and the position of Earth (calculated with SPICE kernel data). The z-axis of the coordinate system points along the magnetic field. The x-axis is chosen so Earth lies in the xz plane. The pitch angle is the angle between the sector look direction and the z-axis. The phase angle is the angle between x-axis and the projection of the x-axis on the xy plane. During the encounter, the stepper motor was moving from position zero thru five. Steps one through five are reported in this data set. The rates reported are in units of counts/sec. Pitch and phase angles are recorded in radians. Model data is used to fill in a large gap in magnetic field data during day 343. Magnetic field directions from 1992-343T13:40:00Z through 1992-343T16:11:00Z are generated by the Tsygenenko 1987 [TSYGENENKO] model. During the gap in magnetic field data, the T87 data is used to calculate the pitch and phase angles. Williams, D. J., R. W. McEntire, S. M. Krimigis, E. C. Roelof, S. Jaskulek, B. Tossman, B. Wilken, W. Studemann, T. P. Armstrong, T. A. Fritz, L. J. Lanzerotti, J. G. Roederer, Energetic Particles at Venus: Galileo Results, Science, 253, 1525, 1991. Townsend, John P., Jr., Galileo Energetic Particles Detector Archive Processor, Applied Physics Laboratory, Johns Hopkins University, March, 1991.

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



NameRoleOriginal AffiliationE-mail
Dr. Donald J. WilliamsData ProviderApplied Physics
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