Morphology of the Io Plasma Torus From Juno Radio Occultations

Moirano, Alessandro; Gomez Casajus, L.; Zannoni, M.; Durante, D.; Tortora, P.

doi:10.1029/2021JA029190

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Morphology of the Io Plasma Torus From Juno Radio Occultations

Moirano, Alessandro; Gomez Casajus, L.; Zannoni, M. et al.

2021 • In Journal of Geophysical Research. Space Physics, 126 (10)

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10.1029/2021JA029190

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Keywords :

Geophysics; Space and Planetary Science

Abstract :

[en] The jovian moon Io disperses about 1 ton/s of material in the planetary magnetosphere, mainly by sublimation of SO2 from the surface and by its intense volcanic activity. The ejected material supplies the plasma cloud surrounding Jupiter known as Io Plasma Torus (IPT). The radio communication between Juno and the Earth DSN station crosses the IPT near the closest approach. Being a dispersive medium, the IPT introduces a path delay in the signal, which can be analyzed to retrieve the density distribution of electrons. We used radio tracking data from the first 25 orbits to investigate the morphology of the IPT and its variability. We adopted a static and axisymmetric model for the electron density and we updated it including temporal and longitudinal variability. We found that our best fit model must include both variabilities, even though on average the morphology of the IPT agrees with previous analyses. Our results suggest that the density of the outer region of the IPT fluctuates over 50% the average value over a typical time scale of about 420 days.

Research Center/Unit :

STAR - Space sciences, Technologies and Astrophysics Research - ULiège

Disciplines :

Space science, astronomy & astrophysics

Author, co-author :

Moirano, Alessandro ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP) ; Department of Industrial Engineering (DIN), Alma Mater Studiorum—Università di Bologna, Forlì, Italy ; Now at: Institute for Space Astrophysics and Planetology, National Institute for Astrophysics, Rome, Italy

Gomez Casajus, L. ; Department of Industrial Engineering (DIN), Alma Mater Studiorum—Università di Bologna, Forlì, Italy ; Interdepartmental Center for Industrial Research in Aerospace (CIRI AERO), Alma Mater Studiorum—Università di Bologna, Forlì, Italy

Zannoni, M. ; Department of Industrial Engineering (DIN), Alma Mater Studiorum—Università di Bologna, Forlì, Italy ; Interdepartmental Center for Industrial Research in Aerospace (CIRI AERO), Alma Mater Studiorum—Università di Bologna, Forlì, Italy

Durante, D. ; Department of Mechanical and Aerospace Engineering (DIMA), Sapienza Università di Roma, Rome, Italy

Tortora, P. ; Department of Industrial Engineering (DIN), Alma Mater Studiorum—Università di Bologna, Forlì, Italy ; Interdepartmental Center for Industrial Research in Aerospace (CIRI AERO), Alma Mater Studiorum—Università di Bologna, Forlì, Italy

Language :

English

Title :

Morphology of the Io Plasma Torus From Juno Radio Occultations

Publication date :

October 2021

Journal title :

Journal of Geophysical Research. Space Physics

ISSN :

2169-9380

eISSN :

2169-9402

Publisher :

John Wiley and Sons Inc

Volume :

126

Issue :

Peer reviewed :

Peer Reviewed verified by ORBi

Additional URL :

https://onlinelibrary.wiley.com/doi/pdf/10.1029/2021JA029190

Funders :

ASI - Agenzia Spaziale Italiana

Funding text :

The authors are grateful to the Italian Space Agency (ASI) for financial support through Agreement No. 2018‐25‐HH.0 in the context of ESA’s JUICE mission, and Agreement No. 2017‐40‐H.1‐2020, and its extension 2017‐40‐H.02020‐13‐HH.0, for ESA’s BepiColombo and NASA’s Juno radio science experiments. The authors are grateful to Dustin Buccino and Ryan S. Park for their suggestions and careful proofreading of the manuscript.The authors are grateful to the Italian Space Agency (ASI) for financial support through Agreement No. 2018-25-HH.0 in the context of ESA’s JUICE mission, and Agreement No. 2017-40-H.1-2020, and its extension 2017-40-H.02020-13-HH.0, for ESA’s BepiColombo and NASA’s Juno radio science experiments. The authors are grateful to Dustin Buccino and Ryan S. Park for their suggestions and careful proofreading of the manuscript. Open Access Funding provided by Universita di Bologna within the CRUI-CARE Agreement.

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