Article (Scientific journals)
An Enhancement of Jupiter's Main Auroral Emission and Magnetospheric Currents
Nichols, J. D.; Allegrini, F.; Bagenal, F. et al.
2020In Journal of Geophysical Research. Space Physics, 125 (8)
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Keywords :
Juno; Jupiter
Abstract :
[en] We present observations of Jupiter's magnetic field and plasma obtained with the NASA Juno spacecraft during February 2018, along with simultaneous Hubble Space Telescope (HST) observations of the planet's auroras. We show that a few-day transient enhancement of the azimuthal and radial magnetic fields and plasma temperature was coincident with a significant brightening of Jupiter's dawn-side main auroral emission. This presents the first evidence of control of Jupiter's main auroral emission intensity by magnetosphere-ionosphere coupling currents. We support this association by self-consistent calculation of the magnetosphere-ionosphere coupling and radial force balance currents using an axisymmetric model, which broadly reproduces the Juno magnetic field and plasma observations and the HST auroral observations. We show that the transient enhancement can be explained by increased hot plasma pressure in the magnetosphere together with increased iogenic plasma mass outflow rate. Overall, this work provides important observational and modeling evidence revealing the behavior of Jupiter's giant magnetosphere. ©2020. American Geophysical Union. All Rights Reserved.
Research Center/Unit :
STAR - Space sciences, Technologies and Astrophysics Research - ULiège
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Nichols, J. D.;  Department of Physics and Astronomy, University of Leicester, Leicester, United Kingdom
Allegrini, F.;  Southwest Research Institute, San Antonio, TX, United States, Department of Physics and Astronomy, University of Texas at San Antonio, San Antonio, TX, United States
Bagenal, F.;  Laboratory for Atmospheric and Space Physics, University of Colorado Boulder, Boulder, CO, United States
Bunce, E. J.;  Department of Physics and Astronomy, University of Leicester, Leicester, United Kingdom
Cowley, S. W. H.;  Department of Physics and Astronomy, University of Leicester, Leicester, United Kingdom
Ebert, R. W.;  Southwest Research Institute, San Antonio, TX, United States, Department of Physics and Astronomy, University of Texas at San Antonio, San Antonio, TX, United States
Grodent, Denis  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)
Huscher, E.;  Laboratory for Atmospheric and Space Physics, University of Colorado Boulder, Boulder, CO, United States
Kamran, A.;  Department of Physics and Astronomy, University of Leicester, Leicester, United Kingdom
Kurth, W. S.;  Department of Physics and Astronomy, University of Iowa, Iowa City, IA, United States
Wilson, R. J.;  Laboratory for Atmospheric and Space Physics, University of Colorado Boulder, Boulder, CO, United States
Yao, Zhonghua ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)
Language :
English
Title :
An Enhancement of Jupiter's Main Auroral Emission and Magnetospheric Currents
Publication date :
2020
Journal title :
Journal of Geophysical Research. Space Physics
ISSN :
2169-9380
eISSN :
2169-9402
Publisher :
Blackwell Publishing Ltd
Volume :
125
Issue :
8
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 19 November 2020

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