Universität zu Köln

Ebert, R. W., Allegrini, F., Bagenal, F., Bolton, S. J., Connerney, J. E. P., Clark, G., Gladstone, G. R., Hue, V., Kurth, W. S., Levin, S., Louarn, P., Mauk, B. H., McComas, D. J., Paranicas, C., Reno, M., Saur, J., Szalay, J. R., Thomsen, M. F., Valek, P., Weidner, S. and Wilson, R. J. (2017). Spatial Distribution and Properties of 0.1-100 keV Electrons in Jupiter's Polar Auroral Region. Geophys. Res. Lett., 44 (18). S. 9199 - 9208. WASHINGTON: AMER GEOPHYSICAL UNION. ISSN 1944-8007

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Abstract

We present observations of 0.1-100 keV electrons from Juno's Jovian Auroral Distributions Experiment Electron instrument over Jupiter's polar auroral region for periods around four Juno perijoves (PJ1, PJ3, PJ4, and PJ5). The observations reveal regions containing magnetic field aligned beams of bidirectional electrons having broad energy distributions interspersed between beams of upward electrons with narrow, peaked energy distributions, regions void of these electrons, and regions dominated by penetrating radiation. The electrons show evidence of acceleration via parallel electric fields (inverted-V structures) and via stochastic processes (bidirectional distributions). The inverted-V structures shown here were observed from similar to 1.4 to 2.9 R-J and had spatial scales of hundreds to thousands of kilometers along Juno's trajectory. The upward electron energy flux was typically greater than the downward flux, the latter ranging between similar to 0.01 and 5 mW m(-2) for two cases shown here which we estimate could produce similar to 0.1-50 kR of ultraviolet emission. Plain Language Summary We report on observations of 0.1 - 100 kilo-electron volt electrons from the Jovian Auroral Distributions Experiment Electron instrument (JADE-E) on Juno over the region where Jupiter's ultraviolet (UV) polar aurora is produced. The observations show electrons moving both towards and away from Jupiter. These electrons show both broad and narrow energy distributions, suggesting the presence of at least two different acceleration mechanisms. Regions void of these electrons and regions dominated by penetrating radiation were also identified. The energy flux of the electrons moving towards Jupiter was sufficient to produce the weaker UV polar auroral emissions observed at Jupiter but a different source of electrons, likely with higher energies, is required to account for the brighter emissions.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Ebert, R. W. UNSPECIFIED UNSPECIFIED UNSPECIFIED Allegrini, F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bagenal, F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bolton, S. J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Connerney, J. E. P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Clark, G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Gladstone, G. R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Hue, V. UNSPECIFIED UNSPECIFIED UNSPECIFIED Kurth, W. S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Levin, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Louarn, P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Mauk, B. H. UNSPECIFIED UNSPECIFIED UNSPECIFIED McComas, D. J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Paranicas, C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Reno, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Saur, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Szalay, J. R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Thomsen, M. F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Valek, P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Weidner, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Wilson, R. J. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-217362
DOI:	10.1002/2017GL075106
Journal or Publication Title:	Geophys. Res. Lett.
Volume:	44
Number:	18
Page Range:	S. 9199 - 9208
Date:	2017
Publisher:	AMER GEOPHYSICAL UNION
Place of Publication:	WASHINGTON
ISSN:	1944-8007
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language FAST SATELLITE-OBSERVATIONS; JOVIAN AURORA; MAGNETOSPHERE Multiple languages Geosciences, Multidisciplinary Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/21736