Spatial Distribution and Properties of 0.1–100 keV Electrons in Jupiter's Polar Auroral Region

R. W. Ebert, F. Allegrini, F. Bagenal, S. J. Bolton, J. E.P. Connerney, G. Clark, G. R. Gladstone, V. Hue, W. S. Kurth, S. Levin, P. Louarn, B. H. Mauk, D. J. McComas, C. Paranicas, M. Reno, J. Saur, J. R. Szalay, M. F. Thomsen, P. Valek, S. WeidnerR. J. Wilson

Research output: Contribution to journalArticle

19 Scopus citations

Abstract

We present observations of 0.1–100 keV electrons from Juno's Jovian Auroral Distributions Experiment Electron instrument over Jupiter's polar auroral region for periods around four Juno perijoves (PJ1, PJ3, PJ4, and PJ5). The observations reveal regions containing magnetic field aligned beams of bidirectional electrons having broad energy distributions interspersed between beams of upward electrons with narrow, peaked energy distributions, regions void of these electrons, and regions dominated by penetrating radiation. The electrons show evidence of acceleration via parallel electric fields (inverted-V structures) and via stochastic processes (bidirectional distributions). The inverted-V structures shown here were observed from ~1.4 to 2.9 RJ and had spatial scales of hundreds to thousands of kilometers along Juno's trajectory. The upward electron energy flux was typically greater than the downward flux, the latter ranging between ~0.01 and 5 mW m−2 for two cases shown here which we estimate could produce ~0.1–50 kR of ultraviolet emission.

Original languageEnglish (US)
Pages (from-to)9199-9207
Number of pages9
JournalGeophysical Research Letters
Volume44
Issue number18
DOIs
StatePublished - Sep 28 2017

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Earth and Planetary Sciences(all)

Keywords

  • electron acceleration
  • Juno
  • Jupiter
  • parallel electric fields
  • polar aurora
  • polar magnetosphere

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    Ebert, R. W., Allegrini, F., Bagenal, F., Bolton, S. J., Connerney, J. E. P., Clark, G., Gladstone, G. R., Hue, V., Kurth, W. S., Levin, S., Louarn, P., Mauk, B. H., McComas, D. J., Paranicas, C., Reno, M., Saur, J., Szalay, J. R., Thomsen, M. F., Valek, P., ... Wilson, R. J. (2017). Spatial Distribution and Properties of 0.1–100 keV Electrons in Jupiter's Polar Auroral Region. Geophysical Research Letters, 44(18), 9199-9207. https://doi.org/10.1002/2017GL075106