Zobrazeno 1 - 10 of 28 pro vyhledávání: '"Roy Christoffersen"'
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Akademický článek
Space Weathering of Genesis Mission Solar-wind Collectors with Inferences for Weathering on Airless Bodies
Autor: Amy J. G. Jurewicz, Karen D. Rieck, Chad Olinger, Judy Allton, Mukul Sharma, Lindsay P. Keller, Roy Christoffersen
Publikováno v: The Planetary Science Journal, Vol 4, Iss 5, p 98 (2023)
Samples from the Genesis Solar Wind Sample Return (NASA Discovery 5) are a unique opportunity to study the initial stages of space weathering, i.e., the physical and chemical effects of solar-wind irradiation. Arrays of collectors containing multiple
Externí odkaz: https://doaj.org/article/fb28d36c0ba841a6b24d11d6e6219136
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2
Solar wind contributions to Earth’s oceans
Autor: Hope A. Ishii, Catherine A. Dukes, Anthony M. Monterrosa, Michelle S. Thompson, Lindsay P. Keller, John P. Bradley, Phillip A. Bland, Lucy V. Forman, Khalid Hattar, Nicholas E. Timms, Lydia J. Hallis, Denis Fougerouse, Luke Daly, Fred Jourdan, Mark J. Loeffler, Zakaria Quadir, Martin Lee, Roy Christoffersen, Tobias Salge, William D.A. Rickard, M. A. Cox, Steven M. Reddy, David W. Saxey, J. Aguiar, Evangelos Christou
Publikováno v: Nature Astronomy. 5:1275-1285
The isotopic composition of water in Earth’s oceans is challenging to recreate using a plausible mixture of known extraterrestrial sources such as asteroids—an additional isotopically light reservoir is required. The Sun’s solar wind could prov
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::07e7fe1d5502e8703588d1bc7129398d
https://doi.org/10.1038/s41550-021-01487-w
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6
DISSOLUTION RATES OF ALLOPHANE WITH VARIABLE Fe CONTENTS: IMPLICATIONS FOR AQUEOUS ALTERATION AND THE PRESERVATION OF X-RAY AMORPHOUS MATERIALS ON MARS
Autor: Roy Christoffersen, Oliver Tschauner, Elizabeth B. Rampe, Hyejeong Lee, T. S. Peretyazhko, Elisabeth M. Hausrath, S. J. Ralston, Chris Defelice
Publikováno v: Clays and Clay Minerals. 69:263-288
Recent measurements from Mars document X-ray amorphous/nano-crystalline materials in multiple locations across the planet. Despite their prevalence, however, little is known about these materials or what their presence implies for the history of Mars
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::8cd82b413f8bbcd59b76eb895f3c4192
https://doi.org/10.1007/s42860-021-00124-x
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9
Spectral and chemical effects of simulated space weathering of the Murchison CM2 carbonaceous chondrite
Autor: Mark J. Loeffler, Roy Christoffersen, Richard V. Morris, Michelle S. Thompson, Lindsay P. Keller
Publikováno v: Icarus. 319:499-511
We performed pulsed-laser irradiation of a chip of the CM2 Murchison carbonaceous chondrite meteorite to simulate micrometeorite impacts on carbonaceous asteroids. Optical reflectance spectroscopy and transmission electron microscopy were performed t
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::98c3e42196499d7953516adf40ff512c
https://doi.org/10.1016/j.icarus.2018.09.022
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