DOI: 10.1002/2015GL064229
论文题名: On the field-aligned electric field in the polar cap
作者: Wing S. ; Fairfield D.H. ; Johnson J.R. ; Ohtani S.-I.
刊名: Geophysical Research Letters
ISSN: 0094-9399
EISSN: 1944-9130
出版年: 2015
卷: 42, 期: 13 起始页码: 5090
结束页码: 5099
语种: 英语
英文关键词: electron acceleration
; field-aligned electric field
; monoenergetic electron
; parallel electric potential
; polar cap
; polar rain
Scopus关键词: Electric potential
; Electrons
; Rain
; Electron acceleration
; Field aligned currents
; Johns Hopkins University Applied Physics Laboratory
; Monoenergetic electrons
; Open field lines
; Particle precipitation
; Polar cap
; Polar rain
; Electric fields
; atmospheric electricity
; electric field
; electron
; magnetopause
; magnetosphere
; polar region
; precipitation (chemistry)
英文摘要: The Johns Hopkins University Applied Physics Laboratory open-field line particle precipitation model predicts downward field-aligned electric field to maintain charge quasi-neutrality. Previous studies confirmed the existence of such electric fields. However, the present study shows that upward field-aligned electric field can be found within upward field-aligned current (FAC) region. In the upward FAC region, upward electric field that accelerates electron downward is seen with the occurrence rates of 82%-96%. In contrast, the occurrence rates in the downward FAC regions are 3%-11%. Polar rain electrons located in the upward FAC region adjacent to closed field lines often show a ramping up of energy with increasing latitude before reaching a plateau. This plateau may be attributed to the magnetosheath electrons that progressively have higher antisunward velocity and lower density with increasing distance from the subsolar point before they asymptotically reach the solar wind values. Key Points A downward parallel electric field develops to maintain charge quasi-neutrality In the upward FAC region, the parallel electric field can sometimes be upward The polar rain electron energy sometimes ramps up before reaching a plateau. © 2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84938207786&doi=10.1002%2f2015GL064229&partnerID=40&md5=87e714ecdcf81cbe71abda13597604d2
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/9014
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: Johns Hopkins University, Applied Physics Laboratory, Laurel, MD, United States
Recommended Citation:
Wing S.,Fairfield D.H.,Johnson J.R.,et al. On the field-aligned electric field in the polar cap[J]. Geophysical Research Letters,2015-01-01,42(13).