Universität zu Köln

Bonfond, B., Hess, S., Gerard, J-C, Grodent, D., Radioti, A., Chantry, V., Saur, J., Jacobsen, S. and Clarke, J. T. (2013). Evolution of the lo footprint brightness I: Far-UV observations. Planet Space Sci., 88. S. 64 - 76. OXFORD: PERGAMON-ELSEVIER SCIENCE LTD. ISSN 0032-0633

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Abstract

The Io footprint (IFP) is a set of auroral spots and an extended tail resulting from the strong interaction between Io and the Jovian magnetosphere. For the first time, we present measurements of the brightness and precipitated power for each individual spot, using the image database gathered from 1997 to 2009 with the Hubble Space Telescope in the Far-UV domain. We show that the relative brightness of the spots varies with the System III longitude of Io. Moreover, our novel measurement method based on 3D simulations of the auroral features allows to derive the precipitated energy fluxes from images on which the emission region is observed at a slant angle. Peak values as high as 2 W/m(2) are observed for the main spot, probably triggering a localized and sudden heating of the atmosphere. Additionally, strong brightness differences are observed from one hemisphere to another. This result indicates that the location of to in the plasma torus is not the only parameter to control the brightness, but that the magnetic field asymmetries also play a key role. Finally, we present new data confirming that significant variations of the spots' brightness on timescales of 2-4 min are ubiquitous, which suggests a relationship with intermittent double layers close to Jovian surface. (C) 2013 Elsevier Ltd. All rights reserved.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Bonfond, B. UNSPECIFIED UNSPECIFIED UNSPECIFIED Hess, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Gerard, J-C UNSPECIFIED UNSPECIFIED UNSPECIFIED Grodent, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Radioti, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Chantry, V. UNSPECIFIED UNSPECIFIED UNSPECIFIED Saur, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Jacobsen, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Clarke, J. T. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-473679
DOI:	10.1016/j.pss.2013.05.023
Journal or Publication Title:	Planet Space Sci.
Volume:	88
Page Range:	S. 64 - 76
Date:	2013
Publisher:	PERGAMON-ELSEVIER SCIENCE LTD
Place of Publication:	OXFORD
ISSN:	0032-0633
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language PLASMA TORUS; AURORA; VARIABILITY; MORPHOLOGY; SIMULATION; EMISSIONS Multiple languages Astronomy & Astrophysics Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/47367