Inflow Speed Analysis of Interchange Injections in Saturn's Magnetosphere

Paranicas, Chris; Thomsen, M.F.; Kollmann, P.; Azari, A.R.; Bader, A.; Badman, S.V.; Dumont, Maïté; Kinrade, J.; Krupp, N.; Roussos, E.

doi:10.1029/2020JA028299

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Inflow Speed Analysis of Interchange Injections in Saturn's Magnetosphere

Paranicas, Chris; Thomsen, M.F.; Kollmann, P. et al.

2020 • In Journal of Geophysical Research. Space Physics

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https://hdl.handle.net/2268/252480

DOI
10.1029/2020JA028299

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Keywords :

Injections; Saturn; Interchange

Abstract :

[en] During its more than 13 years in orbit, the Cassini spacecraft detected a large number of plasma and energetic charged particle injections in Saturn's inner magnetosphere. In the corotating frame of the planet, the plasma contained within an injection moves radially inward with the component particles gaining energy. The highest energy particles in the injection experience stronger gradient‐curvature drifts in the longitudinal direction and can drift out of the main body of the injection. We have used these drift‐out effects to estimate the inflow speed of 19 injections by surveying cases from the available plasma data. We find that the average inflow speed from our sample is 22 km/s, and the values are well distributed between 0 and 50 km/s, with a few higher estimates. We have also computed the radial travel distance of interchange events and found that these are typically one to two Saturn radii. We discuss the implications of these quantifications on our understanding of transport.

Disciplines :

Space science, astronomy & astrophysics

Author, co-author :

Paranicas, Chris

Thomsen, M.F.

Kollmann, P.

Azari, A.R.

Bader, A.

Badman, S.V.

Dumont, Maïté ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)

Kinrade, J.

Krupp, N.

Roussos, E.

Language :

English

Title :

Inflow Speed Analysis of Interchange Injections in Saturn's Magnetosphere

Publication date :

September 2020

Journal title :

Journal of Geophysical Research. Space Physics

ISSN :

2169-9380

eISSN :

2169-9402

Publisher :

Wiley, Hoboken, United States - New Jersey

Peer reviewed :

Peer Reviewed verified by ORBi

Available on ORBi :

since 12 November 2020

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