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Chandrayaan-1 obser...
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Lue, CharlesUmeå universitet,Institutionen för fysik,Swedish Institute of Space Physics, Kiruna
(författare)
Chandrayaan-1 observations of backscattered solar wind protons from the lunar regolith : Dependence on the solar wind speed
- Artikel/kapitelEngelska2014
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LIBRIS-ID:oai:DiVA.org:umu-91225
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https://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-91225URI
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https://doi.org/10.1002/2013JE004582DOI
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Språk:engelska
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Sammanfattning på:engelska
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Ämneskategori:art swepub-publicationtype
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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.
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Futaana, YoshifumiSwedish Institute of Space Physics, Kiruna
(författare)
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Barabash, StasSwedish Institute of Space Physics, Kiruna
(författare)
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Wieser, MartinSwedish Institute of Space Physics, Kiruna
(författare)
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Bhardwaj, AnilSwedish Institute of Space Physics, Kiruna
(författare)
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Wurz, PeterSwedish Institute of Space Physics, Kiruna
(författare)
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Umeå universitetInstitutionen för fysik
(creator_code:org_t)
Sammanhörande titlar
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Ingår i:Journal of Geophysical Research - Planets119:5, s. 968-9752169-90972169-9100
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