Universität zu Köln

Szalay, J. R., Allegrini, F., Bagenal, F., Bolton, S. J., Bonfond, B., Clark, G., Connerney, J. E. P., Ebert, R. W., Hue, V, McComas, D. J., Saur, J., Sulaiman, A. H. and Wilson, R. J. (2020). A New Framework to Explain Changes in Io's Footprint Tail Electron Fluxes. Geophys. Res. Lett., 47 (18). WASHINGTON: AMER GEOPHYSICAL UNION. ISSN 1944-8007

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Abstract

We analyze precipitating electron fluxes connected to 18 crossings of Io's footprint tail aurora, over altitudes of 0.15 to 1.1 Jovian radii (R-J). The strength of precipitating electron fluxes is dominantly organized by Io-Alfven tail distance, the angle along Io's orbit between Io and an Alfven wave trajectory connected to the tail aurora. These fluxes best fit an exponential as a function of down-tail extent with ane-folding distance of 21 degrees. The acceleration region altitude likely increases down-tail, and the majority of parallel electron acceleration sustaining the tail aurora occurs above 1R(J)in altitude. We do not find a correlation between the tail fluxes and the power of the initial Alfven wave launched from Io. Finally, Juno has likely transited Io's Main Alfven Wing fluxtube, observing a characteristically distinct signature with precipitating electron fluxes similar to 600 mW/m(2)and an acceleration region extending as low as 0.4R(J)in altitude.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Szalay, J. R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Allegrini, F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bagenal, F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bolton, S. J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bonfond, B. UNSPECIFIED UNSPECIFIED UNSPECIFIED Clark, G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Connerney, J. E. P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Ebert, R. W. UNSPECIFIED UNSPECIFIED UNSPECIFIED Hue, V UNSPECIFIED UNSPECIFIED UNSPECIFIED McComas, D. J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Saur, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Sulaiman, A. H. UNSPECIFIED UNSPECIFIED UNSPECIFIED Wilson, R. J. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-318129
DOI:	10.1029/2020GL089267
Journal or Publication Title:	Geophys. Res. Lett.
Volume:	47
Number:	18
Date:	2020
Publisher:	AMER GEOPHYSICAL UNION
Place of Publication:	WASHINGTON
ISSN:	1944-8007
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language ALFVEN-WAVE PROPAGATION; PLASMA INTERACTION; JUNO OBSERVATIONS; JUPITERS AURORA; CURRENT SYSTEM; ULTRAVIOLET; ENCELADUS; EMISSIONS; MODEL; SPOTS Multiple languages Geosciences, Multidisciplinary Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/31812