DOI: 10.1029/2018JA025309
Scopus记录号: 2-s2.0-85052397876
论文题名: Poynting Flux in the Dayside Polar Cap Boundary Regions From DMSP F15 Satellite Measurements
作者: Lu Y. ; Deng Y. ; Sheng C. ; Kilcommons L. ; Knipp D.J.
刊名: Journal of Geophysical Research: Space Physics
ISSN: 21699380
出版年: 2018
卷: 123, 期: 8 起始页码: 6948
结束页码: 6956
语种: 英语
英文关键词: cusp
; dayside polar cap
; DMSP F15
; LLBL
; particle precipitation
; Poynting flux
英文摘要: Poynting flux, which describes electromagnetic energy flux, is an important energy source for the high-latitude upper atmosphere. After the launch of Defense Meteorological Satellite Program (DMSP) F15 spacecraft with a boom-mounted magnetometer on board, there was a new opportunity to calculate Earth-directed Poynting flux at satellite altitudes (~850 km) in the upper atmosphere. A persistent enhancement of thermospheric density in the dayside polar cap boundary regions has been reported in the CHAMP satellite observations. To understand the significance of different physical mechanisms including Poynting flux and particle precipitation, and the correlation between them, a statistical study of Poytning flux and particle energy flux in the dayside cusp and low-latitude boundary layer (LLBL) regions has been conducted based on DMSP F15 measurements. DMSP satellite observations showed a dominate downward Poynting flux for most cases in the cusp region. Our analysis of DMSP F15 data for five years (2000–2004) reveals that approximately 53% of 660 cusp crossings at 800–850 km showed strong downward Poynting flux (S > 10 mW/m2), 32% of the crossings had noticeable downward Poynting flux (S > 3 mW/m2), and 7% of the crossings did not show clear Poynting flux (S < 1 mW/m2). Only 13 out of 660 cusp crossings (~2%) showed noticeable upward Poynting flux. In the LLBL region, 35% of 11,641 LLBL crossings showed significant downward Poynting flux, 34% of the crossings had noticeable downward Poynting flux, and only 13% of the crossings did not show clear Poynting flux. On average, Poynting flux in LLBL is smaller than that in the cusp. The results show a slightly negative correlation between Poynting flux and particle precipitation energy flux in the dayside polar cap boundary regions. Statistically, Poynting flux in the cusp is enhanced during interplanetary magnetic field By positive conditions. ©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/113450
Appears in Collections: 气候减缓与适应
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作者单位: Department of Physics, University of Texas at Arlington, Arlington, TX, United States; High Altitude Observatory, National Center for Atmospheric Research, Boulder, CO, United States; Aerospace Engineering Sciences, University of Colorado Boulder, Boulder, CO, United States
Recommended Citation:
Lu Y.,Deng Y.,Sheng C.,et al. Poynting Flux in the Dayside Polar Cap Boundary Regions From DMSP F15 Satellite Measurements[J]. Journal of Geophysical Research: Space Physics,2018-01-01,123(8)