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  Spectral Signatures of Adiabatic Electron Acceleration at Saturn Through Corotation Drift Cancelation

Sun, Y. X., Roussos, E., Krupp, N., Zong, Q. G., Kollmann, P., & Zhou, X. Z. (2019). Spectral Signatures of Adiabatic Electron Acceleration at Saturn Through Corotation Drift Cancelation. Geophysical Research Letters, 46(17-18), 10240-10249. doi:10.1029/2019GL084113.

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 Creators:
Sun, Y. X.1, Author
Roussos, Elias1, Author              
Krupp, Norbert1, Author              
Zong, Q. G., Author
Kollmann, P., Author
Zhou, X. Z., Author
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1Department Planets and Comets, Max Planck Institute for Solar System Research, Max Planck Society, ou_1832288              

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 Abstract: The energetic electron spectra of Saturn's radiation belts are studied using Cassini's 13 years of measurements by the Magnetosphere Imaging Instrument/Low Energy Magnetospheric Measurement System detector. We find that between L shells (L) of 10 and 4.5 the differential flux spectrum of 0.3‐ to 1.6‐MeV electrons evolves from a single power law to two power law functions separated at an energy cutoff (Ec). We show that inside L∼8, Ec has an L shell dependence that tracks consistently the energy of corotation drift cancelation (or resonance) ECDR, that is, the energy at which magnetic electron drifts and azimuthal corotation cancel, and is not associated with the absorbing effects of Saturn's moons. Ec also deviates from what conservation of the first adiabatic invariant would dictate. Our results verify that electrons around ECDR can be transported radially very efficiently by variable convective flows, such as those related to the noon‐midnight electric field in Saturn's magnetosphere.

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Language(s): eng - English
 Dates: 2019
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1029/2019GL084113
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Title: Geophysical Research Letters
  Abbreviation : GRL
Source Genre: Journal
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Publ. Info: Washington, D.C. : American Geophysical Union / Wiley
Pages: - Volume / Issue: 46 (17-18) Sequence Number: - Start / End Page: 10240 - 10249 Identifier: ISSN: 0094-8276
CoNE: https://pure.mpg.de/cone/journals/resource/954925465217