Article (Scientific journals)
Reconnection- and Dipolarization-Driven Auroral Dawn Storms and Injections
Yao, Zhonghua; Bonfond, Bertrand; Clark, G. et al.
2020In Journal of Geophysical Research. Space Physics, 125 (8)
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Keywords :
Jupiter; Juno; Dawn storms
Abstract :
[en] Jupiter displays many distinct auroral structures, among which auroral dawn storms and auroral injections are often observed contemporaneously. However, it is unclear if the contemporaneous nature of the observations is a coincidence or part of an underlying physical connection. We show six clear examples from a recent Hubble Space Telescope campaign (GO-14634) that each display both auroral dawn storms and auroral injection signatures. We found that these conjugate phenomena could exist during intervals of either relatively low or high auroral activity, as evidenced by the varied levels of total auroral power. In situ observations of the magnetosphere by Juno show a strong magnetic reconnection event inside of 45 Jupiter radii (RJ) on the predawn sector, followed by two dipolarization events within the following 2 hr, coincident with the auroral dawn storm and auroral injection event. We therefore suggest that the auroral dawn storm is the manifestation of magnetic reconnection in the dawnside magnetosphere. The dipolarization region is mapped to the auroral injection, strongly suggesting that this was associated with the auroral injection. Since magnetic reconnection and dipolarization are physically connected, we therefore suggest that the often-conjugate auroral dawn storm and auroral injection events are also physically connected consequences. ©2020. The Authors.
Research center :
STAR - Space sciences, Technologies and Astrophysics Research - ULiège
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Yao, Zhonghua ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)
Bonfond, Bertrand  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)
Clark, G.;  Applied Physics Laboratory, Johns Hopkins University, Laurel, MD, United States
Grodent, Denis  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)
Dunn, W. R.;  Mullard Space Science Laboratory, University College London, Dorking, United Kingdom
Vogt, M. F.;  Center for Space Physics, Boston University, Boston, MA, United States
Guo, Ruilong ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)
Mauk, B. H.;  Applied Physics Laboratory, Johns Hopkins University, Laurel, MD, United States
Connerney, J. E. P.;  Space Research Corporation, Annapolis, MD, United States, NASA Goddard Space Flight Center, Greenbelt, MD, United States
Levin, S. M.;  Jet Propulsion Laboratory, Pasadena, CA, United States
Bolton, S. J.;  Southwest Research Institute, San Antonio, TX, United States
Language :
English
Title :
Reconnection- and Dipolarization-Driven Auroral Dawn Storms and Injections
Publication date :
2020
Journal title :
Journal of Geophysical Research. Space Physics
ISSN :
2169-9380
eISSN :
2169-9402
Publisher :
Wiley, Hoboken, United States - New Jersey
Volume :
125
Issue :
8
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
Politique Scientifique Fédérale (Belgique) - BELSPO
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
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