Signatures of volatiles in the lunar proton albedo

N. A. Schwadron, J. K. Wilson, M. D. Looper, A. P. Jordan, H. E. Spence, J. B. Blake, A. W. Case, Y. Iwata, J. C. Kasper, W. M. Farrell, D. J. Lawrence, G. Livadiotis, J. Mazur, N. Petro, C. Pieters, Mark Robinson, S. Smith, L. W. Townsend, C. Zeitlin

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

We find evidence for hydrated material in the lunar regolith using "albedo protons" measured with the Cosmic Ray Telescope for the Effects of Radiation (CRaTER) on the Lunar Reconnaissance Orbiter (LRO). Fluxes of these albedo protons, which are emitted from the regolith due to steady bombardment by high energy radiation (Galactic Cosmic Rays), are observed to peak near the poles, and are inconsistent with the latitude trends of heavy element enrichment (e.g., enhanced Fe abundance). The latitudinal distribution of albedo protons anti-correlates with that of epithermal or high energy neutrons. The high latitude enhancement may be due to the conversion of upward directed secondary neutrons from the lunar regolith into tertiary protons due to neutron-proton collisions in hydrated regolith that is more prevalent near the poles. The CRaTER instrument may thus provide important measurements of volatile distributions within regolith at the Moon and potentially, with similar sensors and observations, at other bodies within the Solar System.

Original languageEnglish (US)
JournalIcarus
DOIs
StateAccepted/In press - Jun 20 2015

Fingerprint

regolith
albedo
signatures
protons
cosmic ray
neutrons
cosmic rays
poles
radiation
Lunar Reconnaissance Orbiter
telescopes
heavy elements
moon
solar system
polar regions
Moon
energy
bombardment
collision
sensor

Keywords

  • Cosmic rays
  • Ices
  • Moon
  • Moon, surface

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Schwadron, N. A., Wilson, J. K., Looper, M. D., Jordan, A. P., Spence, H. E., Blake, J. B., ... Zeitlin, C. (Accepted/In press). Signatures of volatiles in the lunar proton albedo. Icarus. https://doi.org/10.1016/j.icarus.2015.12.003

Signatures of volatiles in the lunar proton albedo. / Schwadron, N. A.; Wilson, J. K.; Looper, M. D.; Jordan, A. P.; Spence, H. E.; Blake, J. B.; Case, A. W.; Iwata, Y.; Kasper, J. C.; Farrell, W. M.; Lawrence, D. J.; Livadiotis, G.; Mazur, J.; Petro, N.; Pieters, C.; Robinson, Mark; Smith, S.; Townsend, L. W.; Zeitlin, C.

In: Icarus, 20.06.2015.

Research output: Contribution to journalArticle

Schwadron, NA, Wilson, JK, Looper, MD, Jordan, AP, Spence, HE, Blake, JB, Case, AW, Iwata, Y, Kasper, JC, Farrell, WM, Lawrence, DJ, Livadiotis, G, Mazur, J, Petro, N, Pieters, C, Robinson, M, Smith, S, Townsend, LW & Zeitlin, C 2015, 'Signatures of volatiles in the lunar proton albedo', Icarus. https://doi.org/10.1016/j.icarus.2015.12.003
Schwadron NA, Wilson JK, Looper MD, Jordan AP, Spence HE, Blake JB et al. Signatures of volatiles in the lunar proton albedo. Icarus. 2015 Jun 20. https://doi.org/10.1016/j.icarus.2015.12.003
Schwadron, N. A. ; Wilson, J. K. ; Looper, M. D. ; Jordan, A. P. ; Spence, H. E. ; Blake, J. B. ; Case, A. W. ; Iwata, Y. ; Kasper, J. C. ; Farrell, W. M. ; Lawrence, D. J. ; Livadiotis, G. ; Mazur, J. ; Petro, N. ; Pieters, C. ; Robinson, Mark ; Smith, S. ; Townsend, L. W. ; Zeitlin, C. / Signatures of volatiles in the lunar proton albedo. In: Icarus. 2015.
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