Imperial College London
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DrAdamMasters

Faculty of Natural Sciences, Department of Physics

Senior Lecturer
 
 
 
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a.masters

 
 
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Location

 

6M69Huxley BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Kronberg:2019:10.1029/2019JA026553,
author = {Kronberg, EA and Grigorenko, EE and Malykhin, A and Kozak, L and Petrenko, B and Vogt, M and Roussos, E and Kollmann, P and Jackman, C and Kasahara, S and Malova, KV and Tao, C and Radioti, A and Masters, A},
doi = {10.1029/2019JA026553},
journal = {Journal of Geophysical Research: Space Physics},
pages = {5056--5069},
title = {Acceleration of ions in Jovian plasmoids: does turbulence play a role?},
url = {http://dx.doi.org/10.1029/2019JA026553},
volume = {124},
year = {2019}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - The dissipation processes which transform electromagnetic energy into kinetic particle energy in space plasmas are still not fully understood. Of particular interest is the distribution of the dissipated energy among different species of charged particles. The Jovian magnetosphere is a unique laboratory to study this question because outflowing ions from the moon Io create a high diversity in ion species. In this work, we use multispecies ion observations and magnetic field measurements by the Galileo spacecraft. We limit our study to observations of plasmoids in the Jovian magnetotail, because there is strong ion acceleration in these structures. Our model predicts that electromagnetic turbulence in plasmoids plays an essential role in the acceleration of oxygen, sulfur, and hydrogen ions. The observations show a decrease of the oxygen and sulfur energy spectral index γ at ∼30 to ∼400 keV/nuc with the wave power indicating an energy transfer from electromagnetic waves to particles, in agreement with the model. The wave power threshold for effective acceleration is of the order of 10 nT2Hz−1, as in terrestrial plasmoids. However, this is not observed for hydrogen ions, implying that processes other than waveparticle interaction are more important for the acceleration of these ions or that the time and energy resolution of the observations is too coarse. The results are expected to be confirmed by improved plasma measurements by the Juno spacecraft.
AU  - Kronberg,EA
AU  - Grigorenko,EE
AU  - Malykhin,A
AU  - Kozak,L
AU  - Petrenko,B
AU  - Vogt,M
AU  - Roussos,E
AU  - Kollmann,P
AU  - Jackman,C
AU  - Kasahara,S
AU  - Malova,KV
AU  - Tao,C
AU  - Radioti,A
AU  - Masters,A
DO  - 10.1029/2019JA026553
EP  - 5069
PY  - 2019///
SN  - 2169-9380
SP  - 5056
TI  - Acceleration of ions in Jovian plasmoids: does turbulence play a role?
T2  - Journal of Geophysical Research: Space Physics
UR  - http://dx.doi.org/10.1029/2019JA026553
UR  - https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2019JA026553
UR  - http://hdl.handle.net/10044/1/71542
VL  - 124
ER  -
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