Greathouse, T. K., Gladstone, G. R., Molyneux, P. M., Versteeg, M. H., Hue, V., Kammer, J. A., Davis, M. W., Bolton, S. J., Giles, R. S., Connerney, J. E. P., Gerard, J. C., Grodent, D. C., Bonfond, B., Saur, J. and Duling, S. (2022). UVS Observations of Ganymede's Aurora During Juno Orbits 34 and 35. Geophys. Res. Lett., 49 (23). WASHINGTON: AMER GEOPHYSICAL UNION. ISSN 1944-8007

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Abstract

On 7 June 2021, Juno-UVS mapped Ganymede's auroral emissions near a closest approach altitude of 1,046 km. The high spatial resolution map exhibits bright, 200-1,000 R, oxygen emissions organized into northern and southern auroral ovals. Though the map has incomplete global coverage, UVS observed longitudinal structure similar to that described by McGrath et al. (2013), and latitudinal and vertical structure never before resolved. The mapped auroral emissions (a) display an intense narrow auroral curtain with a sharp poleward boundary, (b) have a more slowly decreasing equatorial edge on the leading hemisphere, (c) appear to originate near the surface with a vertical extent of 25-50 km, and (d) are slightly brighter in the north than the south. Additionally, we present UVS observations from the more distant Juno Ganymede flyby on 20 July 2021. We describe the observations, compare them to previous Hubble Space Telescope observations and current model predictions of the open-closed-field line-boundary.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Greathouse, T. K.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Gladstone, G. R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Molyneux, P. M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Versteeg, M. H.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hue, V.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kammer, J. A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Davis, M. W.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Bolton, S. J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Giles, R. S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Connerney, J. E. P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Gerard, J. C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Grodent, D. C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Bonfond, B.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Saur, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Duling, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-686277
DOI: 10.1029/2022GL099794
Journal or Publication Title: Geophys. Res. Lett.
Volume: 49
Number: 23
Date: 2022
Publisher: AMER GEOPHYSICAL UNION
Place of Publication: WASHINGTON
ISSN: 1944-8007
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
Geosciences, MultidisciplinaryMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/68627

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