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Poster (Scientific congresses and symposiums)
Electron pulsations generated by rotating magnetospheric dynamics at Saturn
Guo, Ruilong; Yao, Zhonghua; Sergis, N et al.
2019magnetospheres of Outer Planets meeting
 

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Abstract :
[en] Quasi-periodic pulsations of energetic electrons have been frequently observed in Saturn's magnetosphere. The mechanisms for the electron pulsations are far from conclusive, although generally believed to be associated with field-line resonance due to their similar periodicities. Here we report an electron pulsation event that is related to aurora beads and energetic neutral atom (ENA) emissions. The perturbation of the magnetic field indicates that Cassini spacecraft encountered a series of field-aligned currents (FACs) connected to the aurora beads. The fluxes of energetic electrons were enhanced when the spacecraft crossed the FACs. Both aurora beads and ENA emission were rotating. Given that the FACs interconnect the aurora beads and the active region at equator, a hot plasma population associated with the ENA enhancement, we conclude that the FACs were rotating with Saturn and had finite extent in the azimuthal direction. The periodic features also manifested in the whistler-mode auroral hiss emissions in the same event. We proposed that the electron pulsations we studied are spatial effect of the rotating magnetosphere. The rotation of the whole magnetosphere transfers the spatial effect to the temporal effect, i.e., the pulsation sequences observed by Cassinis multiple instruments.
Research center :
STAR - Space sciences, Technologies and Astrophysics Research - ULiège
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Guo, Ruilong ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)
Yao, Zhonghua ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)
Sergis, N;  University of Athens
Palmaerts, Benjamin  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)
Grodent, Denis  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)
Radioti, Aikaterini ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)
Ye, S.Y.
Pu, Z.Y.;  Chinese Academy of Sciences
Yates, J.N.
Badman, Sarah V.;  Lancaster University
Wei, Y
Wan, W.X.
Language :
English
Title :
Electron pulsations generated by rotating magnetospheric dynamics at Saturn
Publication date :
June 2019
Event name :
magnetospheres of Outer Planets meeting
Event organizer :
Tohoku University
Event place :
Sendai, Japan
Event date :
3-7 juin 2019
Audience :
International
Available on ORBi :
since 10 December 2019

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