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Low-Energy Cosmic Rays

NSSDC ID: 1978-079A-03
Mission Name: ISEE 3
Principal Investigator: Dr. Dieter K. Hovestadt


This instrument, designated HOH, carried on ISEE 1 and ISEE 3, was designed to measure solar, interplanetary, and magnetospheric energetic ions in numerous bands within the energy range 2 keV/charge to 80 MeV/nucleon, and electrons in four contiguous bands from 75 to 1300 keV. At the lower energies, charge states of heavy ions in the high-speed (>500 km/s) solar wind were determined. In the range 0.3 to 80 MeV/nucleon, the energy spectra, anisotropies, and composition of energetic ions were determined. In the limited range 0.4 to 6 MeV/nucleon, simultaneous determination of ionic and nuclear charge was possible. The instrument consisted of three different sensor systems. ULECA (ultralow-energy charge analyzer) was an electrostatic analyzer with solid-state detectors. Its energy range was approximately 3 to 560 keV/charge. ULEWAT (ultralow-energy wide-angle telescope) was a dE/dx vs E, thin-window, flow-through proportional counter/solid-state detector telescope covering the range 0.2 to 80 MeV/nucleon (Fe). ULEZEQ (ultralow-energy Z, E, and Q) was a combination of an electrostatic analyzer and a dE/dx versus E system with a thin-window proportional counter and a position-sensitive solid-state detector. The energy range was 0.4 to 6 MeV/nucleon. Data could be obtained in 45-deg sectors.

Facts in Brief

Mass: 11.5 kg
Power (avg): 6.0 W

Funding Agency

  • European Space Agency (International)


  • Space Physics: Heliospheric Studies

Additional Information

Questions or comments about this experiment can be directed to: Dr. H. Kent Hills.



NameRoleOriginal AffiliationE-mail
Prof. George GloecklerOther InvestigatorUniversity of
Dr. Charles Y. FanOther InvestigatorUniversity of Arizona 
Dr. Dieter K. HovestadtPrincipal InvestigatorMax-Planck-Institut fur Extraterrestrische Physik 
Dr. Lennard A. FiskOther InvestigatorUniversity of New
Dr. Joseph J. O'GallagherOther InvestigatorUniversity of
Dr. Manfred ScholerOther InvestigatorMax-Planck-Institut fur Extraterrestrische

Selected References

Hovestadt, D., et al., Nuclear and ionic charge distribution particle experiments on the ISEE-1 and ISEE-C spacecraft, IEEE Trans. Geosci. Electron., GE-16, No. 3, 166-175, July 1978.

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