Diverse Electron and Ion Acceleration Characteristics Observed Over Jupiter's Main Aurora

被引：55

作者：

Mauk, B. H. ^{[1
]}

Haggerty, D. K. ^{[1
]}

Paranicas, C. ^{[1
]}

Clark, G. ^{[1
]}

Kollmann, P. ^{[1
]}

Rymer, A. M. ^{[1
]}

Peachey, J. M. ^{[1
]}

Bolton, S. J. ^{[2
]}

Levin, S. M. ^{[3
]}

Adriani, A. ^{[4
]}

Allegrini, F. ^{[2
,5
]}

Bagenal, F. ^{[6
]}

Bonfond, B. ^{[7
]}

Connerney, J. E. P. ^{[8
]}

Ebert, R. W. ^{[2
]}

Gladstone, G. R. ^{[2
]}

Kurth, W. S. ^{[9
]}

McComas, D. J. ^{[2
,10
]}

Ranquist, D. ^{[6
]}

Valek, P. ^{[2
]}

机构：

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

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

[3] Jet Prop Lab, Pasadena, CA USA

[4] Inst Nazl Astrofis, Inst Astofis & Planetol Spaziali, Rome, Italy

[5] Univ Texas San Antonio, Phys & Astron Dept, San Antonio, TX USA

[6] Univ Colorado, Lab Atmospher & Space Phys, Boulder, CO 80309 USA

[7] Univ Liege, Space Sci Technol & Astrophys Res Inst, LPAP, Liege, Belgium

[8] NASA, Goddard Space Flight Ctr, Greenbelt, MD USA

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

[10] Princeton Univ, Dept Astrophys Sci, Princeton, NJ 08544 USA

来源：

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

关键词：

Jupiter; aurora; Juno; energetic particles; magnetosphere;

D O I：

10.1002/2017GL076901

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

Two new Juno-observed particle features of Jupiter's main aurora demonstrate substantial diversity of processes generating Jupiter's mysterious auroral emissions. It was previously speculated that sometimes-observed potential-driven aurora (up to 400 kV) can turn into broadband stochastic acceleration (dominating at Jupiter) by means of instability. Here direct evidence for such a process is revealed with a mono-energetic electron inverted-V rising in energy to 200 keV, transforming into a region of broadband acceleration with downward energy fluxes tripling to 3,000 mW/m(2), and then transforming back into a mono-energetic structure ramping down from 200 keV. But a second feature of interest observed nearby is unlikely to have operated in the same way. Here a downward accelerated proton inverted-V, with inferred potentials to 300-400kV, occurred simultaneously with downward accelerated broadband electrons with downward energy fluxes as high as any observed (similar to 3,000 mW/m(2)). This latter feature has no known precedent with Earth auroral observations.

引用

页码：1277 / 1285

页数：9

共 26 条

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