Plasma waves in Jupiter's high-latitude regions: Observations from the Juno spacecraft

S. S. Tetrick; D. A. Gurnett; W. S. Kurth; M. Imai; G. B. Hospodarsky; S. J. Bolton; J. E.P. Connerney; S. M. Levin; B. H. Mauk

doi:10.1002/2017GL073073

Plasma waves in Jupiter's high-latitude regions: Observations from the Juno spacecraft

S. S. Tetrick, D. A. Gurnett, W. S. Kurth, M. Imai, G. B. Hospodarsky, S. J. Bolton, J. E.P. Connerney, S. M. Levin, B. H. Mauk

Research output: Contribution to journal › Article › peer-review

27 Scopus citations

Abstract

The Juno Waves instrument detected a new broadband plasma wave emission (~50 Hz to 40 kHz) on 27 August 2016 as the spacecraft passed over the low-altitude polar regions of Jupiter. We investigated the characteristics of this emission and found similarities to whistler mode auroral hiss observed at Earth, including a funnel-shaped frequency-time feature. The electron cyclotron frequency is much higher than both the emission frequency and local plasma frequency, which is assumed to be ~20–40 kHz. The E/cB ratio was about three near the start of the event and then decreased to one for the rest of the period. A correlation of the electric field spectral density with the flux of an upgoing 20 to 800 keV electron beam was found, with a correlation coefficient of 0.59. We conclude that the emission is propagating in the whistler mode and is driven by the energetic upgoing electron beam.

Original language	English (US)
Pages (from-to)	4447-4454
Number of pages	8
Journal	Geophysical Research Letters
Volume	44
Issue number	10
DOIs	https://doi.org/10.1002/2017GL073073
State	Published - May 28 2017
Externally published	Yes

Bibliographical note

Funding Information:
The authors would like to thank NASA and the various institutions that helped make the Juno mission possible. The research at the University of Iowa was supported by NASA through contract 699041X with Southwest Research Institute. The Juno data included herein will eventually be available from NASA's Planetary Data System. In the meantime, data may be requested from the lead author.

Publisher Copyright:
©2017. American Geophysical Union. All Rights Reserved.

Keywords

Juno
Jupiter
Waves
magnetosphere
plasma waves
whistler mode

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title = "Plasma waves in Jupiter's high-latitude regions: Observations from the Juno spacecraft",

abstract = "The Juno Waves instrument detected a new broadband plasma wave emission (~50 Hz to 40 kHz) on 27 August 2016 as the spacecraft passed over the low-altitude polar regions of Jupiter. We investigated the characteristics of this emission and found similarities to whistler mode auroral hiss observed at Earth, including a funnel-shaped frequency-time feature. The electron cyclotron frequency is much higher than both the emission frequency and local plasma frequency, which is assumed to be ~20–40 kHz. The E/cB ratio was about three near the start of the event and then decreased to one for the rest of the period. A correlation of the electric field spectral density with the flux of an upgoing 20 to 800 keV electron beam was found, with a correlation coefficient of 0.59. We conclude that the emission is propagating in the whistler mode and is driven by the energetic upgoing electron beam.",

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note = "Funding Information: The authors would like to thank NASA and the various institutions that helped make the Juno mission possible. The research at the University of Iowa was supported by NASA through contract 699041X with Southwest Research Institute. The Juno data included herein will eventually be available from NASA's Planetary Data System. In the meantime, data may be requested from the lead author. Publisher Copyright: {\textcopyright}2017. American Geophysical Union. All Rights Reserved.",

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AU - Imai, M.

AU - Hospodarsky, G. B.

AU - Bolton, S. J.

AU - Connerney, J. E.P.

AU - Levin, S. M.

AU - Mauk, B. H.

N1 - Funding Information: The authors would like to thank NASA and the various institutions that helped make the Juno mission possible. The research at the University of Iowa was supported by NASA through contract 699041X with Southwest Research Institute. The Juno data included herein will eventually be available from NASA's Planetary Data System. In the meantime, data may be requested from the lead author. Publisher Copyright: ©2017. American Geophysical Union. All Rights Reserved.

PY - 2017/5/28

Y1 - 2017/5/28

N2 - The Juno Waves instrument detected a new broadband plasma wave emission (~50 Hz to 40 kHz) on 27 August 2016 as the spacecraft passed over the low-altitude polar regions of Jupiter. We investigated the characteristics of this emission and found similarities to whistler mode auroral hiss observed at Earth, including a funnel-shaped frequency-time feature. The electron cyclotron frequency is much higher than both the emission frequency and local plasma frequency, which is assumed to be ~20–40 kHz. The E/cB ratio was about three near the start of the event and then decreased to one for the rest of the period. A correlation of the electric field spectral density with the flux of an upgoing 20 to 800 keV electron beam was found, with a correlation coefficient of 0.59. We conclude that the emission is propagating in the whistler mode and is driven by the energetic upgoing electron beam.

AB - The Juno Waves instrument detected a new broadband plasma wave emission (~50 Hz to 40 kHz) on 27 August 2016 as the spacecraft passed over the low-altitude polar regions of Jupiter. We investigated the characteristics of this emission and found similarities to whistler mode auroral hiss observed at Earth, including a funnel-shaped frequency-time feature. The electron cyclotron frequency is much higher than both the emission frequency and local plasma frequency, which is assumed to be ~20–40 kHz. The E/cB ratio was about three near the start of the event and then decreased to one for the rest of the period. A correlation of the electric field spectral density with the flux of an upgoing 20 to 800 keV electron beam was found, with a correlation coefficient of 0.59. We conclude that the emission is propagating in the whistler mode and is driven by the energetic upgoing electron beam.

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Plasma waves in Jupiter's high-latitude regions: Observations from the Juno spacecraft

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