Universität zu Köln

Allegrini, F., Gladstone, G. R., Hue, V, Clark, G., Szalay, J. R., Kurth, W. S., Bagenal, F., Bolton, S., Connerney, J. E. P., Ebert, R. W., Greathouse, T. K., Hospodarsky, G. B., Imai, M., Louarn, P., Mauk, B. H., McComas, D. J., Saur, J., Sulaiman, A. H., Valek, P. W. and Wilson, R. J. (2020). First Report of Electron Measurements During a Europa Footprint Tail Crossing by Juno. Geophys. Res. Lett., 47 (18). WASHINGTON: AMER GEOPHYSICAL UNION. ISSN 1944-8007

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Abstract

We report the first in situ observations of electron measurements at a Europa footprint tail (FPT) crossing in the auroral region. During its 12th science perijove pass, Juno crossed magnetic field lines connected to Europa's FPT. We find that electrons in the range similar to 0.4 to similar to 25 keV, with a characteristic energy of 3.6 +/- 0.5 keV, precipitate into Jupiter's atmosphere to create the footprint aurora. The energy flux peaks at similar to 36 mW/m(2), while the peak ultraviolet (UV) brightness is estimated at 37 kR. We estimate the peak electron density and temperature to be 17.3 cm(-3) and 1.8 +/- 0.1 keV, respectively. Using magnetic flux shell mapping, we estimate that the radial width of the interaction at Europa's orbit spans roughly 3.6 +/- 1.0 Europa radii. In contrast to typical Io FPT crossings, the instrument background caused by penetrating energetic radiation (> similar to 5-10 MeV electrons) increased during the Europa FPT crossing.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Allegrini, F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Gladstone, G. R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Hue, V UNSPECIFIED UNSPECIFIED UNSPECIFIED Clark, G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Szalay, J. R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Kurth, W. S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bagenal, F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bolton, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Connerney, J. E. P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Ebert, R. W. UNSPECIFIED UNSPECIFIED UNSPECIFIED Greathouse, T. K. UNSPECIFIED UNSPECIFIED UNSPECIFIED Hospodarsky, G. B. UNSPECIFIED UNSPECIFIED UNSPECIFIED Imai, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Louarn, P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Mauk, B. H. UNSPECIFIED UNSPECIFIED UNSPECIFIED McComas, D. J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Saur, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Sulaiman, A. H. UNSPECIFIED UNSPECIFIED UNSPECIFIED Valek, P. W. UNSPECIFIED UNSPECIFIED UNSPECIFIED Wilson, R. J. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-318109
DOI:	10.1029/2020GL089732
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 JOVIAN AURORA; EMISSIONS; IO; ACCELERATION; JUPITER Multiple languages Geosciences, Multidisciplinary Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/31810