First Cosmic Ray Proton Albedo Map of the Moon

Details First Cosmic Ray Proton Albedo Map of the Moon First Cosmic Ray Proton Albedo Map of the Moon

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsh51b1671w&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SH51B-1671

Astronomy and Astrophysics

Astrophysics

[5421] Planetary Sciences: Solid Surface Planets / Interactions With Particles And Fields, [6250] Planetary Sciences: Solar System Objects / Moon, [7514] Solar Physics, Astrophysics, And Astronomy / Energetic Particles

Scientific paper

The Lunar Reconnaissance Orbiter (LRO) has been observing the surface and environment of the Moon since June of 2009. The CRaTER instrument (Cosmic Ray Telescope for the Effects of Radiation) on LRO is designed to characterize the lunar radiation environment and its effects on simulated human tissue. CRaTER's multiple solid-state detectors can be used to discriminate the different elements in the galactic cosmic ray (GCR) population above ~10 MeV/nucleon, and can also distinguish between primary GCR protons arriving from deep space from some secondary particles backscattered from the lunar surface (i.e., "albedo"). We use the previously reported strong presence of > 10 MeV protons coming up from the lunar surface to construct a proton albedo map of the Moon. The map accounts for time variation in the secondary particles driven by time variations in the primary GCR population, thus revealing any true spatial variation of the proton albedo with lunar surface properties such as gross mineralogical abundance differences between regolith in maria and highlands.

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