[IGPP Everyone] **Meeting times available** Space Physics Seminar, Fri. 1/12 3:30pm: "Origin of Diffuse Aurora and Electron Butterfly Distributions at Jupiter, Juno Initial Results" (W. Li, Boston Univ.)

[Emmanuel V. Masongsong]

Wen will be arriving this afternoon around 3pm, please email me if you would like to schedule a meeting with her today or tomorrow. Thanks! 

SPACE PHYSICS SEMINAR 
DEPARTMENT OF EARTH, PLANETARY, AND SPACE SCIENCES 


DEPARTMENT OF ATMOSPHERIC AND OCEANIC SCIENCES 

UNIVERSITY OF CALIFORNIA, LOS ANGELES 



Understanding the Origin of Diffuse Aurora and Electron Butterfly Distributions at Jupiter: 
Initial Results from the Juno Mission 



Wen Li 
Center for Space Physics 
Boston Univ. 



Juno is the first spacecraft to explore the low-altitude polar magnetosphere of the Jupiter. The ultraviolet spectrometer (UVS) instrument on board Juno showed extensive diffuse aurora observed equatorward of the main auroral oval. In the region where these diffuse auroral emissions were observed, the JEDI and JADE particle instruments measured nearly full loss cone distributions for the downward-going electrons over energies of 0.1–700 keV, but very few upward-going electrons. The coordinated measurements of diffuse aurora and energetic particle precipitation provide the direct evidence of the origin of Jupiter’s diffuse aurora. Interestingly, near the region where the diffuse aurora emissions are observed, the energetic electron pitch angle distribution exhibits a butterfly-shaped pitch angle distribution, which is often associated with an electrostatic wave below the proton cyclotron frequency. This butterfly distribution is suggested to be formed by parallel acceleration of electrons through Landau resonance with the electrostatic waves. At last, I will briefly discuss a few other highlights on the interesting scientific discoveries from the Juno mission. 






Friday, January 12, 2018 

Room 6704 Geology 

3:30 - 5:00 PM 



In Charge 

V. Angelopoulos 





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