DOI: 10.1029/2018JA025391
Scopus记录号: 2-s2.0-85050307540
论文题名: Interchange Injections at Saturn: Statistical Survey of Energetic H+ Sudden Flux Intensifications
作者: Azari A.R. ; Liemohn M.W. ; Jia X. ; Thomsen M.F. ; Mitchell D.G. ; Sergis N. ; Rymer A.M. ; Hospodarsky G.B. ; Paranicas C. ; Vandegriff J.
刊名: Journal of Geophysical Research: Space Physics
ISSN: 21699380
出版年: 2018
卷: 123, 期: 6 起始页码: 4692
结束页码: 4711
语种: 英语
英文关键词: data mining
; energetic particles
; interchange injections
; plasma transport
; Saturn's magnetosphere
英文摘要: We present a statistical study of interchange injections in Saturn's inner and middle magnetosphere focusing on the dependence of occurrence rate and properties on radial distance, partial pressure, and local time distribution. Events are evaluated from over the entirety of the Cassini mission's equatorial orbits between 2005 and 2016. We identified interchange events from CHarge Energy Mass Spectrometer (CHEMS) H+ data using a trained and tested automated algorithm, which has been compared with manual event identification for optimization. We provide estimates of interchange based on intensity, which we use to investigate current inconsistencies in local time occurrence rates. This represents the first automated detection method of interchange, estimation of injection event intensity, and comparison between interchange injection survey results. We find that the peak rates of interchange occur between 7 and 9 Saturn radii and that this range coincides with the most intense events as defined by H+ partial particle pressure. We determine that nightside occurrence dominates as compared to the dayside injection rate, supporting the hypothesis of an inversely dependent instability growth rate on local Pedersen ionospheric conductivity. Additionally, we observe a slight preference for intense events on the dawnside, supporting a triggering mechanism related to large-scale injections from downtail reconnection. Our observed local time dependence paints a dynamic picture of interchange triggering due to both the large-scale injection-driven process and ionospheric conductivity. ©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/113802
Appears in Collections: 气候减缓与适应
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作者单位: Department of Climate and Space Sciences and Engineering, University of Michigan, Ann Arbor, MI, United States; Planetary Science Institute, Tucson, AZ, United States; Applied Physics Laboratory, The Johns Hopkins University, Laurel, MD, United States; Office of Space Research and Technology, Academy of Athens, Athens, Greece; Institute for Astronomy, Astrophysics, Space Applications and Remote Sensing, National Observatory of Athens, Penteli, Greece; Department of Physics and Astronomy, University of Iowa, Iowa City, IA, United States
Recommended Citation:
Azari A.R.,Liemohn M.W.,Jia X.,et al. Interchange Injections at Saturn: Statistical Survey of Energetic H+ Sudden Flux Intensifications[J]. Journal of Geophysical Research: Space Physics,2018-01-01,123(6)