DOI: 10.1002/2017JA025141
Scopus记录号: 2-s2.0-85044532833
论文题名: Diurnal Variations in Global Joule Heating Morphology and Magnitude Due To Neutral Winds
作者: Billett D.D. ; Grocott A. ; Wild J.A. ; Walach M.-T. ; Kosch M.J.
刊名: Journal of Geophysical Research: Space Physics
ISSN: 21699380
出版年: 2018
卷: 123, 期: 3 起始页码: 2398
结束页码: 2411
语种: 英语
英文关键词: convection
; heating
; IMF
; ionosphere
; neutrals
; thermosphere
英文摘要: In the polar ionosphere, variations in Joule heating are significantly controlled by changes in plasma convection, such as that brought about by changes in the interplanetary magnetic field. However, another important consideration when calculating Joule heating is the velocity difference between this plasma and the neutral thermosphere colocated with the ionosphere. Neutral wind data are often difficult to obtain on a global scale; thus, Joule heating has often previously been calculated assuming that neutral velocities are small and can therefore be neglected. Previous work has shown the effect of neutral winds on Joule heating estimations to be more significant than originally thought; however, the diurnal variations of the neutrals due to changes in solar pressure gradients and Coriolis forces have yet to have their impact on Joule heating assessed. We show this universal time effect to be significant in calculating Joule heating and thus can differ significantly from that calculated by neglecting the neutrals. In this study, we use empirical models for the neutral wind, conductivities, and magnetic field to create Northern Hemispheric patterns of Joule heating for approximately 800,000 individual plasma convection patterns generated using data from the Super Dual Auroral Radar Network. From this, a statistical analysis of how Joule heating varies in morphology and magnitude with universal time is shown for differing seasons and levels of geomagnetic activity. We find that neutral winds do play a significant role in the morphology and total energy output of Joule heating. ©2018. The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114426
Appears in Collections: 气候减缓与适应
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作者单位: Physics Department, Lancaster University, Lancaster, United Kingdom; South African National Space Agency, Hermanus, South Africa
Recommended Citation:
Billett D.D.,Grocott A.,Wild J.A.,et al. Diurnal Variations in Global Joule Heating Morphology and Magnitude Due To Neutral Winds[J]. Journal of Geophysical Research: Space Physics,2018-01-01,123(3)