Energetic particle signatures of magnetic field-aligned potentials over Jupiter's polar regions

G. Clark, B. H. Mauk, D. Haggerty, C. Paranicas, P. Kollmann, A. Rymer, E. J. Bunce, S. W.H. Cowley, D. G. Mitchell, G. Provan, R. W. Ebert, F. Allegrini, F. Bagenal, S. Bolton, J. Connerney, S. Kotsiaros, W. S. Kurth, S. Levin, D. J. McComas, J. SaurP. Valek

Research output: Contribution to journalArticle

20 Scopus citations

Abstract

Recent results of the first ever orbit through Jupiter's auroral region by NASA's Juno spacecraft did not show evidence of coherent acceleration in the auroral or polar region. However, in this letter, we show energetic particle data from Juno's Jupiter Energetic-particle Detector Instrument instrument during the third auroral pass that exhibits conclusive evidence of downward parallel electric fields in portions of Jupiter's polar region. The energetic particle distributions show inverted-V ion and electron structures in a downward electric current region with accelerated peaked distributions in hundreds of keV to ~1 MeV range. The origin of these large electric potential structures is investigated and discussed within the current theoretical framework of current-voltage relationships at both Earth and Jupiter. Parallel electric fields responsible for accelerating particles to maintain the aurora/magnetospheric circuit appear to be a common phenomenon among strongly magnetized planets with conducting ionospheres; however, their origin and generation mechanisms are subjects of ongoing research.

Original languageEnglish (US)
Pages (from-to)8703-8711
Number of pages9
JournalGeophysical Research Letters
Volume44
Issue number17
DOIs
StatePublished - Sep 16 2017

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Earth and Planetary Sciences(all)

Keywords

  • Juno
  • Jupiter
  • auroral particle acceleration
  • downward current regions
  • energetic particles

Fingerprint Dive into the research topics of 'Energetic particle signatures of magnetic field-aligned potentials over Jupiter's polar regions'. Together they form a unique fingerprint.

  • Cite this

    Clark, G., Mauk, B. H., Haggerty, D., Paranicas, C., Kollmann, P., Rymer, A., Bunce, E. J., Cowley, S. W. H., Mitchell, D. G., Provan, G., Ebert, R. W., Allegrini, F., Bagenal, F., Bolton, S., Connerney, J., Kotsiaros, S., Kurth, W. S., Levin, S., McComas, D. J., ... Valek, P. (2017). Energetic particle signatures of magnetic field-aligned potentials over Jupiter's polar regions. Geophysical Research Letters, 44(17), 8703-8711. https://doi.org/10.1002/2017GL074366