Data Set Overview
      =================
      This data set consists of HISCALE Low-Energy Foil Spectrometer
      (LEFS) electron and ion counts at 150 degrees from the
      spacecraft spin axis. These measurements were taken during the
      Ulysses Jupiter encounter 1991-12-31 to 1992-02-16, and
      include 1 hour averaged inbound cruise data (1991-12-31 to
      1992-02-01), and 15 minute averaged encounter data (1992-02-02
      to 1992-02-16).

      The Heliosphere Instrument for Spectra, Composition, and
      Anisotropy at Low Energies is designed to make measurements of
      interplanetary ions and electrons throughout the entire
      Ulysses mission.

      The ions (Ei > 50 keV) and electrons (Ee > 30 keV) are
      identified uniquely and detected by five separate solid-state
      detector telescopes that are oriented to give nearly complete
      pitch-angle coverage from the spinning spacecraft.

      Ion elemental abundances are determined by a del E vs E
      telescope using a thin 5 micrometer front solid state detector
      element in a three element telescope.  Experiment operation is
      controlled by a microprocessor-based data system.

      Inflight calibration is provided by radioactive sources
      mounted on telescope covers which can be closed for
      calibration purposes and for radiation protection during the
      course of the mission.

      Ion and electron spectral information is determined using both
      broad-energy-range rate channels and a 32 channel pulse-height
      analyses (channels spaced logarithmically) for more detailed
      spectra.

      About LEFS150

      LEFS150 counts both electron and ions at 150 degrees from the
      spacecraft spin axis.

      E1      40-65        keV  electrons
      E2      60-107       keV  electrons
      E3      107-170      keV  electrons
      E4      170-280      keV  electrons
      FP5     540-765      keV  ions
      FP6     765-1223     keV  ions
      FP7     1.223-4.942  MeV  ions

      HISCALE References (cited in [ARMSTRONG&SAHI1996])

      Curtis, D.W., ISPM/Ulysses LAN Data Processing Software
      Status, Dec. 1986.

      Gold R.E., LAN Accelerator Calibration Test Plan, August 1991.

      Guynn D.R. Jr., LAN Experiment Data System Performance and
      Interface Specification, June 1992.

      Kohl, J.W., J.H. Crawford, Calibration of Solar Polar Energy
      Model LAN-2B Detector Head at GSFC Low Energy Accelerator,
      July 1986.

      Simnett, G.M., R.E. Gold, The RTG Background in the LAN
      Experiment and the Shielding Required to Control It, April
      1980.

      Tappin, S.J., HSIO-HiScale I/O Library, June 1991.

      Ximenez de Ferran S., Ulysses Spin Reference Pulse, May 1985.

Confidence Level Overview
      =========================
      None provided. For more information regarding the confidence
      level of this data set please contact:
        THOMAS P. ARMSTRONG
        Dept. of Physics and Astronomy
        University of Kansas
        Lawrence, KS 66045
        USA
        Phone: 1-913-864-4726  Fax: 1-913-864-5262
        Internet: armstrong@kuphsx.phsx.ukans.edu