Universität zu Köln

Plainaki, C., Milillo, A., Mura, A., Saur, J., Orsini, S. and Massetti, S. (2013). Exospheric O-2 densities at Europa during different orbital phases. Planet Space Sci., 88. S. 42 - 53. OXFORD: PERGAMON-ELSEVIER SCIENCE LTD. ISSN 0032-0633

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Abstract

Europa's exosphere is a mixture of different species among which sputtered H2O and H-2 dominate in the highest altitudes and O-2, formed mainly by radiolysis of ice and subsequent release of the produced molecules, prevails at lower altitudes. Europa's O-2 exosphere has been demonstrated through both observation and simulation-based techniques to be spatially non-uniform. In the present study we investigate Europa's exospheric O-2 characteristics under the external conditions that are likely in the Jupiter's magnetospheric environment, applying the Europa Global model of Exospheric Outgoing Neutrals (EGEON, Plainaki et al., 2012) for different configurations between the positions of Europa, Jupiter and the Sun. We demonstrate for the first time that the spatial distribution of Europa's exosphere is explicitly time-variable due to the time-varying relative orientations of solar illumination and the incident plasma direction. We show that the O-2 release efficiency depends both on solar illumination and plasma impact direction. The modeled densities at different orbital phases of Europa are compared, a posteriori, with the analysis results from two observations in order to validate the model. Using the outputs of EGEON we also calculate the supply of neutral oxygen atoms of exospheric origin to Europa's neutral cloud. (C) 2013 Elsevier Ltd. All rights reserved.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Plainaki, C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Milillo, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Mura, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Saur, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Orsini, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Massetti, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-472233
DOI:	10.1016/j.pss.2013.08.011
Journal or Publication Title:	Planet Space Sci.
Volume:	88
Page Range:	S. 42 - 53
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 ELECTRON-STIMULATED DISSOCIATION; AMORPHOUS D2O ICE; IO PLASMA TORUS; OXYGEN ATMOSPHERE; WATER ICE; GALILEAN SATELLITES; SODIUM ATMOSPHERE; EROSION; TEMPERATURES; BOMBARDMENT Multiple languages Astronomy & Astrophysics Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/47223