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Updated: Dec 13, 2025

Molecular Beam Mass Spectrometry With Tunable Vacuum Ultraviolet VUV Synchrotron Radiation
Published on: October 30, 2012
Measurement of Cosmic Ray and Trapped Proton LET Spectra on the STS-95 HOST Mission
E G Stassinopoulos1, J L Barth1, C A Stauffer2
1National Aeronautics and Space Administration located at Goddard Space Flight Center, Greenbelt, MD 20771 USA.
Abstract:
This paper reports on in situ measurements of the Linear-Energy-Transfer (LET) spectra of galactic cosmic rays and their progeny and of trapped Van Allen belt protons as recorded by a Pulse Height Analyzer (PHA) radiation spectrometer which flew on the STS-95 DISCOVERY mission on the Hubble Orbital Systems Test (HOST) cradle. The Shuttle was launched on 29 October 1998 and had a mission duration of 8.5 days during the minimum phase of the solar activity cycle. The orbit of the STS-95 was about 550 km altitude and 28.5° inclination. Close agreement was seen between radiation environment model predictions and the measurements of the PHA. Agreement is obtained by considering the directionality of the radiation interacting with the Shuttle structure.
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