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Chandrayaan-1 obser...
Chandrayaan-1 observations of backscattered solar wind protons from the lunar regolith : Dependence on the solar wind speed
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- Lue, Charles (author)
- Umeå universitet,Institutionen för fysik,Swedish Institute of Space Physics, Kiruna
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- Futaana, Yoshifumi (author)
- Swedish Institute of Space Physics, Kiruna
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- Barabash, Stas (author)
- Swedish Institute of Space Physics, Kiruna
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- Wieser, Martin (author)
- Swedish Institute of Space Physics, Kiruna
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- Bhardwaj, Anil (author)
- Swedish Institute of Space Physics, Kiruna
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- Wurz, Peter (author)
- Swedish Institute of Space Physics, Kiruna
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(creator_code:org_t)
- 2014
- 2014
- English.
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In: Journal of Geophysical Research - Planets. - 2169-9097 .- 2169-9100. ; 119:5, s. 968-975
- Related links:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Subject headings
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- We study the backscattering of solar wind protons from the lunar regolith using the Solar Wind Monitor of the Sub-keV Atom Reflecting Analyzer on Chandrayaan-1. Our study focuses on the component of the backscattered particles that leaves the regolith with a positive charge. We find that the fraction of the incident solar wind protons that backscatter as protons, i.e., the proton-backscattering efficiency, has an exponential dependence on the solar wind speed that varies from similar to 0.01% to similar to 1% for solar wind speeds of 250km/s to 550km/s. We also study the speed distribution of the backscattered protons in the fast (similar to 550km/s) solar wind case and find both a peak speed at similar to 80% of the solar wind speed and a spread of similar to 85km/s. The observed flux variations and speed distribution of the backscattered protons can be explained by a speed-dependent charge state of the backscattered particles.
Subject headings
- NATURVETENSKAP -- Fysik -- Fusion, plasma och rymdfysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Fusion, Plasma and Space Physics (hsv//eng)
Keyword
- Moon
- proton
- backscatter
- regolith
Publication and Content Type
- ref (subject category)
- art (subject category)
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