Universität zu Köln

Bonfond, B., Grodent, D., Badman, S. V., Saur, J., Gerard, J. -C. and Radioti, A. (2017). Similarity of the Jovian satellite footprints: Spots multiplicity and dynamics. Icarus, 292. S. 208 - 218. SAN DIEGO: ACADEMIC PRESS INC ELSEVIER SCIENCE. ISSN 1090-2643

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Abstract

In the magnetospheres of Jupiter and Saturn, the intense interaction of the satellites Io, Europa, Ganymede and Enceladus with their surrounding plasma environment leaves a signature in the aurora of the planet. Called satellite footprints, these auroral features appear either as a single spot (Europa and Enceladus) or as multiple spots (10 and Ganymede). Moreover, they can be followed by extended trailing tails in the case of lo and Europa, while no tail has been reported for Ganymede and Enceladus, yet. Here we show that all Jovian footprints can be made of several spots. Furthermore, the footprints all experience brightness variations on timescale of 2-3 min. We also demonstrate that the satellite location relative to the plasma sheet is not the only driver for the footprint brightness, but that the plasma environment and the magnetic field strength also play a role. These new findings demonstrate that the Europa and Ganymede footprints are very similar to the Io footprint. As a consequence, the processes expected to take place at Io, such as the bi-directional electron acceleration by Alfven waves or the partial reflection of these waves on plasma density gradients, can most likely be extended to the other footprints, suggesting that they are indeed universal processes. (C) 2017 Elsevier Inc. All rights reserved.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Bonfond, B. UNSPECIFIED UNSPECIFIED UNSPECIFIED Grodent, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Badman, S. V. UNSPECIFIED UNSPECIFIED UNSPECIFIED Saur, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Gerard, J. -C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Radioti, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-224085
DOI:	10.1016/j.icarus.2017.01.009
Journal or Publication Title:	Icarus
Volume:	292
Page Range:	S. 208 - 218
Date:	2017
Publisher:	ACADEMIC PRESS INC ELSEVIER SCIENCE
Place of Publication:	SAN DIEGO
ISSN:	1090-2643
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language IO; JUPITER; AURORA; MORPHOLOGY; EMISSION; GANYMEDE Multiple languages Astronomy & Astrophysics Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/22408