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Programmer and End User Guide for Processing LEPA Data Files,

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Several Pc-based FORTRAN codes are available for processing data files generated by both the scientific magnetometer and Low Energy Plasma Analyzer LEPA, instruments mounted on the Combined Release and Radiation Effects Satellite CRRES. These codes read in the raw and background counts and convert the net counts into differential directional number fluxes, fomega, E, for each specific sensor look direction as functions of voltage-level mode and energy channel. These codes also use the magnetometer data to derive pitch angles, a, for the corresponding fluxes. LEPAFLUX uses a PL post-processed magnetometer file to find fomega, E and a in satellite body-centered coordinate systems. PCCALMAG derives the BCI-based components of the measured geomagnetic field with higher time resolution to be used by GET3DBIN. Like LEPAFLUX, the GET3DBIN code generates omega E. GET3DBIN then uses the attitude determination software previously developed by Radex to transform the look directions of the measurements to a space-fixed system in which the fluxes are sorted by a and azimuth, defined as the angle of rotation about the magnetic field line from a direction approximately radially outward. GET3DBIN lastly writes out the mean fluxes and the associated bin indices to a file. This guide will describe the software processing for extracting the three-dimensional distribution function of the electrons and ions with energy range from 10 eV to 30 keV. Beside giving the operational procedures of the codes, the guide will also provide physical insights and mathematical background of the algorithms whenever appropriate for better understanding of the outputs.

Subject Categories:

  • Computer Programming and Software
  • Electricity and Magnetism
  • Nuclear Physics and Elementary Particle Physics

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