Home > Research > Publications & Outputs > Energetic particle signatures above Saturn’s au...

Associated organisational unit

Electronic data

  • bader_energetic_2019_jgr

    Rights statement: Accepted for publication in Journal of Geophysical Research: Space Physics. Copyright 2019 American Geophysical Union. Further reproduction or electronic distribution is not permitted.

    Accepted author manuscript, 4.22 MB, PDF document

    Available under license: CC BY: Creative Commons Attribution 4.0 International License

Links

Text available via DOI:

View graph of relations

Energetic particle signatures above Saturn’s aurorae

Research output: Contribution to Journal/MagazineJournal articlepeer-review

Published

Standard

Energetic particle signatures above Saturn’s aurorae. / Bader, Alexander; Badman, Sarah; Ray, Licia C; Paranicas, C.; Lorch, Chris; Clark, George; Andre, Mats; Mitchell, Donald G.; Constable, David A.; Kinrade, Joe; Hunt, Gregory; Pryor, W. R.

In: Journal of Geophysical Research: Space Physics, Vol. 125, No. 1, e2019JA027403, 01.01.2020.

Research output: Contribution to Journal/MagazineJournal articlepeer-review

Harvard

Bader, A, Badman, S, Ray, LC, Paranicas, C, Lorch, C, Clark, G, Andre, M, Mitchell, DG, Constable, DA, Kinrade, J, Hunt, G & Pryor, WR 2020, 'Energetic particle signatures above Saturn’s aurorae', Journal of Geophysical Research: Space Physics, vol. 125, no. 1, e2019JA027403. https://doi.org/10.1029/2019JA027403

APA

Bader, A., Badman, S., Ray, L. C., Paranicas, C., Lorch, C., Clark, G., Andre, M., Mitchell, D. G., Constable, D. A., Kinrade, J., Hunt, G., & Pryor, W. R. (2020). Energetic particle signatures above Saturn’s aurorae. Journal of Geophysical Research: Space Physics, 125(1), [e2019JA027403]. https://doi.org/10.1029/2019JA027403

Vancouver

Bader A, Badman S, Ray LC, Paranicas C, Lorch C, Clark G et al. Energetic particle signatures above Saturn’s aurorae. Journal of Geophysical Research: Space Physics. 2020 Jan 1;125(1). e2019JA027403. https://doi.org/10.1029/2019JA027403

Author

Bader, Alexander ; Badman, Sarah ; Ray, Licia C ; Paranicas, C. ; Lorch, Chris ; Clark, George ; Andre, Mats ; Mitchell, Donald G. ; Constable, David A. ; Kinrade, Joe ; Hunt, Gregory ; Pryor, W. R. / Energetic particle signatures above Saturn’s aurorae. In: Journal of Geophysical Research: Space Physics. 2020 ; Vol. 125, No. 1.

Bibtex

@article{90a66d61d1f1426d94fb0e2302790bcd,
title = "Energetic particle signatures above Saturn{\textquoteright}s aurorae",
abstract = "Near the end of its mission, NASA's Cassini spacecraft performed several low‐altitude passes across Saturn's auroral region. We present auroral imagery and various coincident particle and field measurements of two such passes, providing important information about the structure and dynamics of Saturn's auroral acceleration region. In upward field‐aligned current regions, upward proton beams are observed to reach energies of several tens of keV; the associated precipitating electron populations are found to have mean energies of about 10 keV. With no significant wave activity being apparent, these findings indicate strong parallel potentials responsible for auroral acceleration; about 100 times stronger than at Earth. This is further supported by observations of proton conics in downward field‐aligned current regions above the acceleration region, which feature a lower energy cutoff above ~50 keV ‐ indicating energetic proton populations trapped by strong parallel potentials while being transversely energized until they can overcome the trapping potential, likely through wave‐particle interactions. A spacecraft pass through a downward current region at an altitude near the acceleration region reveals plasma wave features which may be driving the transverse proton acceleration generating the conics. Overall, the signatures observed resemble those related to the terrestrial and Jovian aurorae, the particle energies and potentials at Saturn appearing to be significantly higher than at Earth and comparable to those at Jupiter.",
author = "Alexander Bader and Sarah Badman and Ray, {Licia C} and C. Paranicas and Chris Lorch and George Clark and Mats Andre and Mitchell, {Donald G.} and Constable, {David A.} and Joe Kinrade and Gregory Hunt and Pryor, {W. R.}",
note = "Accepted for publication in Journal of Geophysical Research: Space Physics. Copyright 2019 American Geophysical Union. Further reproduction or electronic distribution is not permitted.",
year = "2020",
month = jan,
day = "1",
doi = "10.1029/2019JA027403",
language = "English",
volume = "125",
journal = "Journal of Geophysical Research: Space Physics",
issn = "2169-9402",
publisher = "Blackwell Publishing Ltd",
number = "1",

}

RIS

TY - JOUR

T1 - Energetic particle signatures above Saturn’s aurorae

AU - Bader, Alexander

AU - Badman, Sarah

AU - Ray, Licia C

AU - Paranicas, C.

AU - Lorch, Chris

AU - Clark, George

AU - Andre, Mats

AU - Mitchell, Donald G.

AU - Constable, David A.

AU - Kinrade, Joe

AU - Hunt, Gregory

AU - Pryor, W. R.

N1 - Accepted for publication in Journal of Geophysical Research: Space Physics. Copyright 2019 American Geophysical Union. Further reproduction or electronic distribution is not permitted.

PY - 2020/1/1

Y1 - 2020/1/1

N2 - Near the end of its mission, NASA's Cassini spacecraft performed several low‐altitude passes across Saturn's auroral region. We present auroral imagery and various coincident particle and field measurements of two such passes, providing important information about the structure and dynamics of Saturn's auroral acceleration region. In upward field‐aligned current regions, upward proton beams are observed to reach energies of several tens of keV; the associated precipitating electron populations are found to have mean energies of about 10 keV. With no significant wave activity being apparent, these findings indicate strong parallel potentials responsible for auroral acceleration; about 100 times stronger than at Earth. This is further supported by observations of proton conics in downward field‐aligned current regions above the acceleration region, which feature a lower energy cutoff above ~50 keV ‐ indicating energetic proton populations trapped by strong parallel potentials while being transversely energized until they can overcome the trapping potential, likely through wave‐particle interactions. A spacecraft pass through a downward current region at an altitude near the acceleration region reveals plasma wave features which may be driving the transverse proton acceleration generating the conics. Overall, the signatures observed resemble those related to the terrestrial and Jovian aurorae, the particle energies and potentials at Saturn appearing to be significantly higher than at Earth and comparable to those at Jupiter.

AB - Near the end of its mission, NASA's Cassini spacecraft performed several low‐altitude passes across Saturn's auroral region. We present auroral imagery and various coincident particle and field measurements of two such passes, providing important information about the structure and dynamics of Saturn's auroral acceleration region. In upward field‐aligned current regions, upward proton beams are observed to reach energies of several tens of keV; the associated precipitating electron populations are found to have mean energies of about 10 keV. With no significant wave activity being apparent, these findings indicate strong parallel potentials responsible for auroral acceleration; about 100 times stronger than at Earth. This is further supported by observations of proton conics in downward field‐aligned current regions above the acceleration region, which feature a lower energy cutoff above ~50 keV ‐ indicating energetic proton populations trapped by strong parallel potentials while being transversely energized until they can overcome the trapping potential, likely through wave‐particle interactions. A spacecraft pass through a downward current region at an altitude near the acceleration region reveals plasma wave features which may be driving the transverse proton acceleration generating the conics. Overall, the signatures observed resemble those related to the terrestrial and Jovian aurorae, the particle energies and potentials at Saturn appearing to be significantly higher than at Earth and comparable to those at Jupiter.

U2 - 10.1029/2019JA027403

DO - 10.1029/2019JA027403

M3 - Journal article

VL - 125

JO - Journal of Geophysical Research: Space Physics

JF - Journal of Geophysical Research: Space Physics

SN - 2169-9402

IS - 1

M1 - e2019JA027403

ER -