globalchange  > 科学计划与规划
DOI: 10.1002/2016GL068363
论文题名:
On the formation of Ganymede's surface brightness asymmetries: Kinetic simulations of Ganymede's magnetosphere
作者: Fatemi S.; Poppe A.R.; Khurana K.K.; Holmström M.; Delory G.T.
刊名: Geophysical Research Letters
ISSN: 0094-9620
EISSN: 1944-9351
出版年: 2016
卷: 43, 期:10
起始页码: 4745
结束页码: 4754
语种: 英语
英文关键词: energetic ion ; Ganymede ; hybrid model ; magnetospheric interaction ; plasma precipitation ; surface brightness
Scopus关键词: Ions ; Magnetosphere ; Precipitation (chemical) ; Energetic ion ; Ganymede ; Hybrid model ; Magnetospheric interaction ; Surface brightness ; Luminance
英文摘要: Ganymede possesses strong surface brightness asymmetries both between its polar cap and equatorial regions and between its leading and trailing hemispheres. Here we test the hypothesis that these asymmetries are due to differential Jovian plasma and energetic particle precipitation to the surface with the combination of a hybrid plasma model (kinetic ions and fluid electrons) and a particle tracing model. We describe the hybrid model, the first of its kind applied to Ganymede, and compare the results to both Galileo observations and previous MHD and MHD-EPIC models of Ganymede. We calculate spatially resolved precipitating Jovian ion fluxes to the surface of Ganymede for energies 1 < E < 104 keV and find (1) precipitating fluxes peak near 100 keV and (2) excellent correlation between the precipitating flux and Ganymede's surface brightness variations. Thus, we conclude that precipitating energetic particle fluxes are the primary driver for altering the surface brightness of Ganymede. ©2016. American Geophysical Union. All Rights Reserved.
URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84970951891&doi=10.1002%2f2016GL068363&partnerID=40&md5=70f30910de5a073c89b4321d8419df2e
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/10583
Appears in Collections:科学计划与规划
气候变化与战略

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作者单位: Space Sciences Laboratory, University of California, Berkeley, CA, United States

Recommended Citation:
Fatemi S.,Poppe A.R.,Khurana K.K.,et al. On the formation of Ganymede's surface brightness asymmetries: Kinetic simulations of Ganymede's magnetosphere[J]. Geophysical Research Letters,2016-01-01,43(10).
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