Evidence for Non‐Monotonic and Broadband Electron Distributions in the Europa Footprint Tail Revealed by Juno In Situ Measurements

Jonas Rabia, V. Hue, Jamey Szalay, nicolas andre, Q. Nénon, Michel Blanc, F. Allegrini, scott bolton, jack connerney, Robert Ebert, Randy Gladstone, T. K. Greathouse, Philippe Louarn, Alessandro Mura, E. Penou, Ali Sulaiman

Research output: Contribution to journalLetterpeer-review

6 Scopus citations

Abstract

We characterize the precipitating electrons accelerated in the Europa-magnetosphere interaction by analyzing in situ measurements and remote sensing observations recorded during 10 crossings of the flux tubes connected to Europa's auroral footprint tail by Juno. The electron downward energy flux, ranging from 34 to 0.8 mW/m2, exhibits an exponential decay as a function of downtail distance, with an e-folding factor of 7.4°. Electrons are accelerated at energies between 0.3 and 25 keV, with a characteristic energy that decreases downtail. The electron distributions form non-monotonic spectra in the near tail (i.e., within an angular separation of less than 4°) that become broadband in the far tail. The size of the interaction region at the equator is estimated to be 4.2 ± 0.9 Europa radii, consistent with previous estimates based on theory and UV observations.

Original languageEnglish (US)
Article numbere2023GL103131
Pages (from-to)e2023GL103131
JournalGeophysical Research Letters
Volume50
Issue number12
DOIs
StatePublished - Jun 28 2023

Bibliographical note

Publisher Copyright:
© 2023. The Authors.

Fingerprint

Dive into the research topics of 'Evidence for Non‐Monotonic and Broadband Electron Distributions in the Europa Footprint Tail Revealed by Juno In Situ Measurements'. Together they form a unique fingerprint.

Cite this