气候变化领域集成服务门户(CCPortal): A Persistent Depletion of Plasma Ions Within Jupiter's Auroral Polar Caps

CCPortal

DOI	10.1029/2020GL090764
	A Persistent Depletion of Plasma Ions Within Jupiter's Auroral Polar Caps
	Pollock C.J.; Ebert R.W.; Allegrini F.; Bagenal F.; McComas D.J.; Szalay J.R.; Valek P.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:23
英文摘要	Regions poleward of Jupiter's main auroral ovals are largely devoid of 0.01 to 46 keV/q ions. We report ion measurements from the plasma instrument on the Juno spacecraft in polar orbit around Jupiter that characterize the presence or absence of structured ion fluxes poleward of the main ovals. We approximate geometric centers of published north and south Jovian main ovals and develop a probability metric for observation of plasma ions as a function of angular distance from these centers to the magnetic foot points of the observations, in the north and south separately. Using data from Juno's first 26 perijoves, at Jovicentric distances of 1.06 to 12 RJ, this metric shows a systematic decrease within both north and south main ovals, in the probability of observing plasma ions as the chosen centers are approached. This is consistent with previous reports of large electrostatic potential drops above Jupiter's polar caps. © 2020. American Geophysical Union. All Rights Reserved.
英文关键词	Orbits; Angular distance; Auroral oval; Electrostatic potentials; Geometric center; Ion fluxes; Plasma instruments; Plasma ions; Polar orbit; Ions; aurora; geometry; ionic composition; Jupiter; planetary atmosphere; plasma; probability; spacecraft
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/169335
作者单位	Denali Scientific, Fairbanks, AK, United States; Southwest Research Institute, San Antonio, TX, United States; Department of Physics and Astronomy, University of Texas at San Antonio, San Antonio, TX, United States; Laboratory of Atmospheric and Space Physics, University of Colorado, Boulder, CO, United States; Department of Astrophysical Science, Princeton University, Princeton, NJ, United States
推荐引用方式 GB/T 7714	Pollock C.J.,Ebert R.W.,Allegrini F.,et al. A Persistent Depletion of Plasma Ions Within Jupiter's Auroral Polar Caps[J],2020,47(23).
APA	Pollock C.J..,Ebert R.W..,Allegrini F..,Bagenal F..,McComas D.J..,...&Valek P..(2020).A Persistent Depletion of Plasma Ions Within Jupiter's Auroral Polar Caps.Geophysical Research Letters,47(23).
MLA	Pollock C.J.,et al."A Persistent Depletion of Plasma Ions Within Jupiter's Auroral Polar Caps".Geophysical Research Letters 47.23(2020).