Article (Scientific journals)
Detection and Characterization of Circular Expanding UV Emissions Observed in Jupiter's Polar Auroral Regions
Hue, V.; Greathouse, T. K.; Gladstone, G. R. et al.
2021In Journal of Geophysical Research. Space Physics, 126 (3), p. 28971
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Keywords :
aurora; Jupiter; magnetosphere; magnetospheric interaction; plasma physics; ultraviolet spectrograph
Abstract :
[en] Jupiter's polar auroral region hosts UV auroral emissions that relate to the magnetospheric dynamics from the outer magnetosphere. Juno UVS has discovered intriguing features characterized by expanding emission circles of UV brightness <140 kR. These events are located at the border of the previously defined swirl region, nearby the polar dark region. The features expand into a circular shape up to ∼1,000 km in radius, at expansion velocities from 3.3 ± 1.7 up to 7.7 ± 3.5 km/s, as measured over the four best observed cases. Using color ratio measurements as a proxy for the depth of the recorded features, the mean electron energy responsible for these emissions is 80-160 keV. Events occurring in the outer magnetosphere at distances >100 RJ are likely causing for these features. Dayside magnetopause reconnection and Kelvin Helmholtz instabilities resulting from the shear flows near the magnetopause are expected to generate field aligned currents that could potentially be the cause of these features.
Research center :
STAR - Space sciences, Technologies and Astrophysics Research - ULiège
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Hue, V.
Greathouse, T. K.
Gladstone, G. R.
Bonfond, Bertrand  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)
Gérard, Jean-Claude  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO)
Vogt, M. F.
Grodent, Denis  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)
Versteeg, M. H.
Kammer, J. A.
Clark, G.
Ebert, R. W.
Giles, R. S.
Davis, M. W.
Haewsantati, Kamolporn  ;  Université de Liège - ULiège > STAR
Bolton, S. J.
Levin, S. M.
Connerney, J. E. P.
More authors (7 more) Less
Language :
English
Title :
Detection and Characterization of Circular Expanding UV Emissions Observed in Jupiter's Polar Auroral Regions
Publication date :
2021
Journal title :
Journal of Geophysical Research. Space Physics
ISSN :
2169-9380
eISSN :
2169-9402
Publisher :
Wiley, Hoboken, United States - New Jersey
Volume :
126
Issue :
3
Pages :
e28971
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
Politique Scientifique Fédérale (Belgique) - BELSPO
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since 19 August 2021

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