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The dynamics of Saturn's main aurorae

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The dynamics of Saturn's main aurorae. / Bader, Alexander; Badman, Sarah; Cowley, S. W. H.; Yao, Zhonghua; Ray, Licia C; Kinrade, Joe; Bunce, E. J.; Provan, G.; Bradley, T. J.; Tao, Chihiro; Hunt, G. J.; Pryor, W.

In: Geophysical Research Letters, Vol. 46, No. 17-18, 30.09.2019, p. 10283-10294.

Research output: Contribution to journalJournal article

Harvard

Bader, A, Badman, S, Cowley, SWH, Yao, Z, Ray, LC, Kinrade, J, Bunce, EJ, Provan, G, Bradley, TJ, Tao, C, Hunt, GJ & Pryor, W 2019, 'The dynamics of Saturn's main aurorae', Geophysical Research Letters, vol. 46, no. 17-18, pp. 10283-10294. https://doi.org/10.1029/2019GL084620

APA

Bader, A., Badman, S., Cowley, S. W. H., Yao, Z., Ray, L. C., Kinrade, J., Bunce, E. J., Provan, G., Bradley, T. J., Tao, C., Hunt, G. J., & Pryor, W. (2019). The dynamics of Saturn's main aurorae. Geophysical Research Letters, 46(17-18), 10283-10294. https://doi.org/10.1029/2019GL084620

Vancouver

Bader A, Badman S, Cowley SWH, Yao Z, Ray LC, Kinrade J et al. The dynamics of Saturn's main aurorae. Geophysical Research Letters. 2019 Sep 30;46(17-18):10283-10294. https://doi.org/10.1029/2019GL084620

Author

Bader, Alexander ; Badman, Sarah ; Cowley, S. W. H. ; Yao, Zhonghua ; Ray, Licia C ; Kinrade, Joe ; Bunce, E. J. ; Provan, G. ; Bradley, T. J. ; Tao, Chihiro ; Hunt, G. J. ; Pryor, W. / The dynamics of Saturn's main aurorae. In: Geophysical Research Letters. 2019 ; Vol. 46, No. 17-18. pp. 10283-10294.

Bibtex

@article{4fc49cd92d3a4f04b355637133adf8a7,
title = "The dynamics of Saturn's main aurorae",
abstract = "Saturn's main aurorae are thought to be generated by plasma flow shears associated with a gradient in angular plasma velocity in the outer magnetosphere. Dungey cycle convection across the polar cap, in combination with rotational flow, may maximize (minimize) this flow shear at dawn (dusk) under strong solar wind driving. Using imagery from Cassini's Ultraviolet Imaging Spectrograph, we surprisingly find no related asymmetry in auroral power but demonstrate that the previously observed “dawn arc” is a signature of quasiperiodic auroral plasma injections commencing near dawn, which seem to be transient signatures of magnetotail reconnection and not part of the static main aurorae. We conclude that direct Dungey cycle driving in Saturn's magnetosphere is small compared to internal driving under usual conditions. Saturn's large‐scale auroral dynamics hence seem predominantly controlled by internal plasma loading, with plasma release in the magnetotail being triggered both internally through planetary period oscillation effects and externally through solar wind compressions.",
author = "Alexander Bader and Sarah Badman and Cowley, {S. W. H.} and Zhonghua Yao and Ray, {Licia C} and Joe Kinrade and Bunce, {E. J.} and G. Provan and Bradley, {T. J.} and Chihiro Tao and Hunt, {G. J.} and W. Pryor",
year = "2019",
month = sep
day = "30",
doi = "10.1029/2019GL084620",
language = "English",
volume = "46",
pages = "10283--10294",
journal = "Geophysical Research Letters",
issn = "0094-8276",
publisher = "John Wiley & Sons, Ltd",
number = "17-18",

}

RIS

TY - JOUR

T1 - The dynamics of Saturn's main aurorae

AU - Bader, Alexander

AU - Badman, Sarah

AU - Cowley, S. W. H.

AU - Yao, Zhonghua

AU - Ray, Licia C

AU - Kinrade, Joe

AU - Bunce, E. J.

AU - Provan, G.

AU - Bradley, T. J.

AU - Tao, Chihiro

AU - Hunt, G. J.

AU - Pryor, W.

PY - 2019/9/30

Y1 - 2019/9/30

N2 - Saturn's main aurorae are thought to be generated by plasma flow shears associated with a gradient in angular plasma velocity in the outer magnetosphere. Dungey cycle convection across the polar cap, in combination with rotational flow, may maximize (minimize) this flow shear at dawn (dusk) under strong solar wind driving. Using imagery from Cassini's Ultraviolet Imaging Spectrograph, we surprisingly find no related asymmetry in auroral power but demonstrate that the previously observed “dawn arc” is a signature of quasiperiodic auroral plasma injections commencing near dawn, which seem to be transient signatures of magnetotail reconnection and not part of the static main aurorae. We conclude that direct Dungey cycle driving in Saturn's magnetosphere is small compared to internal driving under usual conditions. Saturn's large‐scale auroral dynamics hence seem predominantly controlled by internal plasma loading, with plasma release in the magnetotail being triggered both internally through planetary period oscillation effects and externally through solar wind compressions.

AB - Saturn's main aurorae are thought to be generated by plasma flow shears associated with a gradient in angular plasma velocity in the outer magnetosphere. Dungey cycle convection across the polar cap, in combination with rotational flow, may maximize (minimize) this flow shear at dawn (dusk) under strong solar wind driving. Using imagery from Cassini's Ultraviolet Imaging Spectrograph, we surprisingly find no related asymmetry in auroral power but demonstrate that the previously observed “dawn arc” is a signature of quasiperiodic auroral plasma injections commencing near dawn, which seem to be transient signatures of magnetotail reconnection and not part of the static main aurorae. We conclude that direct Dungey cycle driving in Saturn's magnetosphere is small compared to internal driving under usual conditions. Saturn's large‐scale auroral dynamics hence seem predominantly controlled by internal plasma loading, with plasma release in the magnetotail being triggered both internally through planetary period oscillation effects and externally through solar wind compressions.

U2 - 10.1029/2019GL084620

DO - 10.1029/2019GL084620

M3 - Journal article

VL - 46

SP - 10283

EP - 10294

JO - Geophysical Research Letters

JF - Geophysical Research Letters

SN - 0094-8276

IS - 17-18

ER -