Pitch Angle Scattering of Upgoing Electron Beams in Jupiter's Polar Regions by Whistler Mode Waves

被引：18

作者：

Elliott, S. S. ^{[1
]}

Gurnett, D. A. ^{[1
]}

Kurth, W. S. ^{[1
]}

Clark, G. ^{[2
]}

Mauk, B. H. ^{[2
]}

Bolton, S. J. ^{[3
]}

Connerney, J. E. P. ^{[4
]}

Levin, S. M. ^{[5
]}

机构：

[1] Univ Iowa, Dept Phys & Astron, Iowa City, IA 52242 USA

[2] Johns Hopkins Univ, Appl Phys Lab, Laurel, MD USA

[3] Southwest Res Inst, San Antonio, TX USA

[4] Goddard Space Flight Ctr, Greenbelt, MD USA

[5] Jet Prop Lab, Pasadena, CA USA

来源：

GEOPHYSICAL RESEARCH LETTERS | 2018年 / 45卷 / 03期

关键词：

pitch angle scattering; Juno; upgoing electron beams; whistler mode; Jupiter; polar cap; MAGNETOSPHERE; DIFFUSION;

D O I：

10.1002/2017GL076878

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

The Juno spacecraft's Jupiter Energetic-particle Detector Instrument has observed field-aligned, unidirectional (upgoing) electron beams throughout most of Jupiter's entire polar cap region. The Waves instrument detected intense broadband whistler mode emissions occurring in the same region. In this paper, we investigate the pitch angle scattering of the upgoing electron beams due to interactions with the whistler mode waves. Profiles of intensity versus pitch angle for electron beams ranging from 2.53 to 7.22 Jovian radii show inconsistencies with the expected adiabatic invariant motion of the electrons. It is believed that the observed whistler mode waves perturb the electron motion and scatter them away from the magnetic field line. The diffusion equation has been solved by using diffusion coefficients which depend on the magnetic intensity of the whistler mode waves.

引用

页码：1246 / 1252

页数：7

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