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How well do we know the polar hydrogen distribution on the Moon?

Teodoro, L.F.A. and Eke, V.R. and Elphic, R.C. and Feldman, W.C. and Lawrence, D.J. (2014) 'How well do we know the polar hydrogen distribution on the Moon?', Journal of geophysical research : planets., 119 (3). pp. 574-593.


A detailed comparison is made of results from the Lunar Prospector Neutron Spectrometer (LPNS) and the Lunar Exploration Neutron Detector Collimated Sensors for Epithermal Neutrons (LEND CSETN). Using the autocorrelation function and power spectrum of the polar count rate maps produced by these experiments, it is shown that the LEND CSETN has a footprint that is at least as big as would be expected for an omnidirectional detector at an orbital altitude of 50 km. The collimated flux into the field of view of the collimator is negligible. A dip in the count rate in Shoemaker crater is found to be consistent with being a statistical fluctuation superimposed on a significant, larger-scale decrease in the count rate, providing no evidence for high spatial resolution of the LEND CSETN. The maps of lunar polar hydrogen with the highest contrast, i.e., spatial resolution, are those resulting from pixon image reconstructions of the LPNS data. These typically provide weight percentages of water-equivalent hydrogen that are accurate to 30% within the polar craters.

Item Type:Article
Keywords:Polar, Distribution, Hydrogen, Lunar.
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Publisher statement:Teodoro, L. F. A., Eke, V. R., Elphic, R. C., Feldman, W. C. and Lawrence, D. J. (2014), How well do we know the polar hydrogen distribution on the Moon?, Journal of Geophysical Research: Planets, 119, 574-593, DOI: 10.1002/2013JE004421. To view the published open abstract, go to and enter the DOI.
Date accepted:13 November 2013
Date deposited:14 April 2015
Date of first online publication:06 December 2013
Date first made open access:No date available

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