Energetic neutral atom imaging of the lunar surface

Vorburger, Audrey; Wurz, Peter; Barabash, S.; Wieser, M.; Futaana, Y.; Lue, C.; Holmström, M.; Bhardwaj, A.; Dhanya, M. B.; Asamura, K. (2013). Energetic neutral atom imaging of the lunar surface. Journal of Geophysical Research: Space Physics, 118(7), pp. 3937-3945. AGU Publications 10.1002/jgra.50337

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Since the Moon is not shielded by a global magnetic field or by an atmosphere, solar wind plasma impinges onto the lunar surface almost unhindered. Until recently, it was assumed that almost all of the impinging solar wind ions are absorbed by the surface. However, recent Interstellar Boundary Explorer, Chandrayaan-1, and Kaguya observations showed that the interaction process between the solar wind ions and the lunar surface is more complex than previously assumed. In contrast to previous assumptions, a large fraction of the impinging solar wind ions is backscattered as energetic neutral atoms. Using the complete Chandrayaan-1 Energetic Neutral Analyzer data set, we compute a global solar wind reflection ratio of 0.16 ± 0.05 from the lunar surface. Since these backscattered neutral particles are not affected by any electric or magnetic fields, each particle's point of origin on the lunar surface can be determined in a straight-forward manner allowing us to create energetic neutral atom maps of the lunar surface. The energetic neutral atom measurements recorded by the Chandrayaan-1 Energetic Neutral Analyzer cover ˜89% of the lunar surface, whereby the lunar farside is almost completely covered. We analyzed all available energetic neutral atom measurements recorded by the Chandrayaan-1 Energetic Neutral Analyzer to create the first global energetic neutral hydrogen maps of the lunar surface.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Physics Institute > Space Research and Planetary Sciences

UniBE Contributor:

Vorburger, Audrey and Wurz, Peter

Subjects:

500 Science > 530 Physics

ISSN:

2169-9380

Publisher:

AGU Publications

Language:

English

Submitter:

Cléa Serpollier

Date Deposited:

10 Jul 2014 11:48

Last Modified:

09 Oct 2015 07:42

Publisher DOI:

10.1002/jgra.50337

BORIS DOI:

10.7892/boris.44242

URI:

https://boris.unibe.ch/id/eprint/44242

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