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Low-Energy Ions and Electrons (LAN/HI-SCALE)

NSSDC ID: 1990-090B-03
Mission Name: Ulysses
Principal Investigator: Dr. Louis J. Lanzerotti


The objectives of this investigation are (1) to investigate the solar-flare process with measurements of non-relativistic and relativistic electrons, and non-relativistic ions, and their dependence on heliolatitude; (2) to investigate solar elemental abundances with measurements of chemical composition of nuclei of solar origin at all heliolatitudes; (3) to investigate the interplanetary propagation of solar energetic particles by measurement of anisotropy and composition parameters; (4) to investigate acceleration processes; and (5) to investigate temporal and spatial variations of particle intensity in and near the Jovian magnetosphere. The instrumentation consists of two double-ended solid state detector systems which measure ions in the range 50 keV to 5 MeV and electrons in the range 30 to 300 keV, and a (dE/dX, E) telescope using a 5-micrometer-thick front detector for ion elemental abundances in the range 1 to 15 MeV/nucleon (Fe). Each double-ended system is composed on one end of a foil spectrometer in which a 0.35 mg/sq cm thin foil excludes ions below 0.350 keV, allowing electrons above 30 keV to be detected. Further, one of the other ends of one of the systems is a magnetic spectrometer, using a rare-earth magnet to separate electrons from ions (geometric factor for ions is approximately 0.5 sq cm-sr, and for electrons 0.05 sq cm-sr). Orientation of the sensor systems is such that complete pitch-angle coverage is obtained. The instrument has a mass of 5.8 kg including shielding, and uses 4.0 W of power. The data rate is 80 bps in cruise mode and 160 bps in tracking mode.

Alternate Names

  • LAN

Facts in Brief

Mass: 5.78 kg
Power (avg): 4.0 W
Bit rate (avg): 100.0 bps

Funding Agency

  • National Aeronautics and Space Administration (United States)


  • Planetary Science: Fields and Particles
  • Space Physics: Heliospheric Studies
  • Space Physics: Zodiacal Light/Interplanet Dust

Additional Information

Questions or comments about this experiment can be directed to: Dr. John F. Cooper.



NameRoleOriginal AffiliationE-mail
Prof. Kinsey A. AndersonCo-InvestigatorUniversity of California,
Dr. Robert E. GoldCo-InvestigatorApplied Physics
Prof. Robert P. LinCo-InvestigatorUniversity of California, Berkeley 
Dr. Monique PickCo-InvestigatorObservatoire de Paris,
Dr. Louis J. LanzerottiPrincipal InvestigatorAT&T Bell
Dr. Thomas P. ArmstrongCo-InvestigatorUniversity of
Prof. Emmanuel T. SarrisCo-InvestigatorUniversity of
Dr. Edward C. RoelofCo-InvestigatorApplied Physics
Dr. George M. SimnettCo-InvestigatorUniversity of
Dr. Stamatios M. KrimigisCo-InvestigatorApplied Physics

Selected References

Wenzel, K.-P., et al., The International Solar Polar mission--its scientific investigations, ESA SP-1050, Paris, France, July 1983.

Lanzerotti, L. J., et al., Heliosphere instrument for spectra, composition and anisotropy at low energies, Astron. Astrophys. Suppl. Ser., 92, No. 2, 349-363, Jan. 1992.

Armstrong, T. P., and R. Sahi, Ulysses HiScale data analysis handbook (Part I), U of Kansas, Dept. Physics Astron., Lawrence, KS, Apr. 1996.

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