Temporal and Spatial Variability of Lunar Hydration As Observed by the Deep Impact Spacecraft

Details Temporal and Spatial Variability of Lunar Hydration As Observed by the Deep Impact Spacecraft Temporal and Spatial Variability of Lunar Hydration As Observed by the Deep Impact Spacecraft

Oct 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009sci...326..565s&link_type=abstract

Science, Volume 326, Issue 5952, pp. 565- (2009).

Computer Science

80

Scientific paper

The Moon is generally anhydrous, yet the Deep Impact spacecraft found the entire surface to be hydrated during some portions of the day. Hydroxyl (OH) and water (H2O) absorptions in the near infrared were strongest near the North Pole and are consistent with <0.5 weight percent H2O. Hydration varied with temperature, rather than cumulative solar radiation, but no inherent absorptivity differences with composition were observed. However, comparisons between data collected 1 week (a quarter lunar day) apart show a dynamic process with diurnal changes in hydration that were greater for mare basalts (~70%) than for highlands (~50%). This hydration loss and return to a steady state occurred entirely between local morning and evening, requiring a ready daytime source of water-group ions, which is consistent with a solar wind origin.

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