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The Advanced Composition Explorer Mission pp 357–408Cite as

The Solar Isotope Spectrometer for the Advanced Composition Explorer

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Abstract

The Solar Isotope Spectrometer (SIS), one of nine instruments on the Advanced Composition Explorer (ACE), is designed to provide high-resolution measurements of the isotopic composition of energetic nuclei from He to Zn (Z = 2 to 30) over the energy range from ∼ 10 to ∼ 100 MeV nucl-1. During large solar events SIS will measure the isotopic abundances of solar energetic particles to determine directly the composition of the solar corona and to study particle acceleration processes. During solar quiet times SIS will measure the isotopes of low-energy cosmic rays from the Galaxy and isotopes of the anomalous cosmic-ray component, which originates in the nearby interstellar medium. SIS has two telescopes composed of silicon solid-state detectors that provide measurements of the nuclear charge, mass, and kinetic energy of incident nuclei. Within each telescope, particle trajectories are measured with a pair of two-dimensional silicon-strip detectors instrumented with custom, very large-scale integrated (VLSI) electronics to provide both position and energy-loss measurements. SIS was especially designed to achieve excellent mass resolution under the extreme, high flux conditions encountered in large solar particle events. It provides a geometry factor of ∼ 40 cm2 sr, significantly greater than earlier solar particle isotope spectrometers. A microprocessor controls the instrument operation, sorts events into prioritized buffers on the basis of their charge, range, angle of incidence, and quality of trajectory determination, and formats data for readout by the spacecraft. This paper describes the design and operation of SIS and the scientific objectives that the instrument will address.

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Author information

Author notes

  1. B. L. Dougherty

    Present address: Caltech, Mail Code 264-33, Pasadena, CA, 91125, USA

  2. B. D. Milliken

    Present address: Lucent Technologies, Naperville, IL, 60566, USA

Authors and Affiliations

  1. California Institute of Technology, Pasadena, CA, 91125, USA

    E. C. Stone, C. M. S. Cohen, W. R. Cook, A. C. Cummings, B. Gauld, B. Kecman, R. A. Leske, R. A. Mewaldt & M. R. Thayer

  2. Jet Propulsion Laboratory, Pasadena, CA, 91109, USA

    B. L. Dougherty, R. L. Grumm, B. D. Milliken, R. G. Radocinski & M. E. Wiedenbeck

  3. NASA/Goddard Space Flight Center, Greenbelt, MD, 20771, USA

    E. R. Christian, S. Shuman & T. T. Von Rosenvinge

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  1. E. C. Stone
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  2. C. M. S. Cohen
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  4. A. C. Cummings
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Editor information

Editors and Affiliations

  1. University of California, Los Angeles, CA, USA

    C. T. Russell

  2. California Institute of Technology, Pasadena, CA, USA

    R. A. Mewaldt

  3. NASA/Goddard Space Flight Center, Greenbelt, MD, USA

    T. T. Von Rosenvinge

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Stone, E.C. et al. (1998). The Solar Isotope Spectrometer for the Advanced Composition Explorer. In: Russell, C.T., Mewaldt, R.A., Von Rosenvinge, T.T. (eds) The Advanced Composition Explorer Mission. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-4762-0_15

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