DOI: 10.1029/2018JA025486
Scopus记录号: 2-s2.0-85050739433
论文题名: ARTEMIS Observations of Solar Wind Proton Scattering off the Lunar Surface
作者: Lue C. ; Halekas J.S. ; Poppe A.R. ; McFadden J.P.
刊名: Journal of Geophysical Research: Space Physics
ISSN: 21699380
出版年: 2018
卷: 123, 期: 7 起始页码: 5289
结束页码: 5299
语种: 英语
英文关键词: lunar regolith
; particle-surface interaction
; proton scattering
; solar wind-moon interaction
英文摘要: We study the scattering of solar wind protons off the lunar surface, using ion observations collected over 6 years by the ARTEMIS satellites at the Moon. We show the average scattered proton energy spectra, directional scattering distributions, and scattering efficiency, for different solar wind incidence angles and impact speeds. We find that the protons have a scattering distribution that is similar to existing empirical models for scattered hydrogen energetic neutral atoms, with a peak in the backward direction (toward the Sun). We provide a revised model for the scattered proton energy spectrum. We evaluate the positive to neutral charge state ratio by comparing the proton spectrum with existing models for scattered hydrogen. The positive to neutral ratio increases with increasing exit speed from the surface but decreases with increasing impact speed. Combined, these counteracting effects result in a scattering efficiency that decreases from ~0.5% at 300 km/s solar wind speed to ~0.3% at 600 km/s solar wind speed. ©2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113607
Appears in Collections: 气候减缓与适应
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作者单位: Department of Physics and Astronomy, University of Iowa, Iowa City, IA, United States; Swedish Institute of Space Physics, Kiruna, Sweden; Space Sciences Laboratory, University of California, Berkeley, CA, United States
Recommended Citation:
Lue C.,Halekas J.S.,Poppe A.R.,et al. ARTEMIS Observations of Solar Wind Proton Scattering off the Lunar Surface[J]. Journal of Geophysical Research: Space Physics,2018-01-01,123(7)