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Zeitlin C.,Southwest Research Institute | Case A.W.,Harvard - Smithsonian Center for Astrophysics | Spence H.E.,Institute for the Study of Earth New Hampshire | Schwadron N.A.,Institute for the Study of Earth New Hampshire | And 8 more authors.
Space Weather | Year: 2013

The Cosmic Ray Telescope for the Effects of Radiation (CRaTER) instrument aboard the Lunar Reconnaissance Orbiter has been measuring energetic charged particles from the galactic cosmic rays (GCRs) and solar particle events in lunar orbit since 2009. CRaTER includes three pairs of silicon detectors, separated by pieces of tissue-equivalent plastic that shield two of the three pairs from particles incident at the zenith-facing end of the telescope. Heavy-ion beams studied in previous ground-based work have been shown to be reasonable proxies for the GCRs when their energies are sufficiently high. That work, which included GCR simulations, led to predictions for the amount of dose reduction that would be observed by CRaTER. Those predictions are compared to flight data obtained by CRaTER in 2010-2011. Key PointsCRaTER measures the shielding effects of cosmic rays by TEPMeasurements are compared both to model predictions and accelerator dataThe results agree with predictions from models and accelerator data. © 2013 American Geophysical Union. All Rights Reserved. Source

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