Universität zu Köln

Roth, Lorenz ORCID: 0000-0003-0554-4691, Saur, Joachim ORCID: 0000-0003-1413-1231, Retherford, Kurt D., Feldman, Paul D. and Strobel, Darrell F. (2014). A phenomenological model of Io's UV aurora based on HST/STIS observations. Icarus, 228. S. 386 - 407. SAN DIEGO: ACADEMIC PRESS INC ELSEVIER SCIENCE. ISSN 1090-2643

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Abstract

We have carried out a comprehensive analysis of a large set of spatially resolved observations of Io's 01 1304 angstrom, 01] 1356 angstrom, SI 1479 angstrom and SI] 1900 A aurora taken by the Space Telescope Imaging Spectrograph (STIS) of the Hubble Space Telescope (HST) between 1997 and 2001. We find that the variability of the observed morphologies can be solely explained by the changes of the plasma and magnetic field environment of the 10 torus and by the viewing perspective. The variations in brightness are strongly correlated with the periodic variations of the ambient electron density. Based on these findings we develop a phenomenological model for the spatial distribution of the oxygen and sulfur emissions in Io's vicinity. Taking into account lo's position with respect to the plasma torus, the orientation of Jupiter's magnetic field and the viewing perspective of the observation, the model calculates the auroral morphology and brightness. By fitting the model parameters to the observations we find that the model is able to reproduce the main features in all images obtained over a period of five years with one parameter set for each emission multiplet. The spatial distribution of the 011 1356 angstrom, 01 1304 angstrom, SI 1479 angstrom, and SI] 1900 A multiplets are shown to be very similar. In contrast to previous investigations, the model results reveal that the majority of the radiation from the bound atmosphere is emitted within 100 km above the surface. The equatorial aurora spots extend far into the wake region explaining observed features in the downstream region. The relative brightness of two the equatorial spots is best explained by our model if the emission on the dayside flank of lo is higher by a factor of 1.5 with respect to the nightside flank. The measured brightness during an observation in eclipse is significantly lower than expected from the fitted model. The day-night asymmetry and the brightness decrease in eclipse support the idea of a wide collapse of lo's atmosphere in shadow. Since our phenomenological aurora model is able to reproduce the main features of the observed morphology by taking into account the variations of the magnetospheric parameters, it can be applied to predict the emission for future UV aurora observations for a given time and position of the observer. (C) 2013 Elsevier Inc. Al! rights reserved.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Roth, Lorenz UNSPECIFIED orcid.org/0000-0003-0554-4691 UNSPECIFIED Saur, Joachim UNSPECIFIED orcid.org/0000-0003-1413-1231 UNSPECIFIED Retherford, Kurt D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Feldman, Paul D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Strobel, Darrell F. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-448511
DOI:	10.1016/j.icarus.2013.10.009
Journal or Publication Title:	Icarus
Volume:	228
Page Range:	S. 386 - 407
Date:	2014
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 EXCITATION CROSS-SECTIONS; ELECTRON-BEAMS; ATOMIC OXYGEN; PLASMA TORUS; NEUTRAL OXYGEN; ATMOSPHERE; SULFUR; EMISSION; SO2; SUBLIMATION Multiple languages Astronomy & Astrophysics Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/44851