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Instrument: SIS : Solar Isotope Spectrometer
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The Solar Isotope Spectrometer (SIS) on the Advanced Composition Explorer (ACE)
is designed to provide high resolution measurements of the isotopic composition
of energetic nuclei from He to Ni (Z=2 to 28) over the energy range from ~10 to
~100 MeV/nucleon. During large solar events, when particle fluxes can increase
over quiet-time values by factors of up to 10000, SIS will measure the isotopic
composition of the solar corona, while during solar quiet times SIS will
measure the isotopes of low-energy Galactic cosmic rays and the composition of
the anomalous cosmic rays which are thought to originate in the nearby
interstellar medium. The solar energetic particle measurements are useful to
further our understanding of the Sun, while also providing a baseline for
comparison with the Galactic cosmic ray measurements carried out by the Cosmic
Ray Isotope Spectrometer (CRIS) oon ACE.

SIS is also part of the Real Time Solar Wind (RTSW) set of instruments flying
aboard ACE. Four of ACE's nine instruments will be constantly monitored by the
National Oceanic and Atmospheric Administration (NOAA) operated ground
stations. The data from these instruments will be used by NOAA to evaluate the
risk of geomagnetic storms from solar events and to make predictions of these
storms rapidly available.

SIS was designed and developed by the California Institute of Technology, the
NASA/Goddard Space Flight Center, and the Jet Propulsion Laboratory.

Online Resources

Instrument Logistics
Data Rate: 2 kbps
Instrument Start Date: 1997-08-25
Instrument Owner: NASA
California Institute of Technology