Energetic Proton Acceleration Associated With Io's Footprint Tail

G. Clark; B. H. Mauk; P. Kollmann; J. R. Szalay; A. H. Sulaiman; D. J. Gershman; J. Saur; S. Janser; K. Garcia-Sage; T. Greathouse; C. Paranicas; F. Allegrini; F. Bagenal; S. J. Bolton; J. E.P. Connerney; R. W. Ebert; G. Hospodarsky; D. Haggerty; V. Hue; M. Imai; S. Kotsiaros; D. J. McComas; A. Rymer; J. Westlake

doi:10.1029/2020GL090839

Energetic Proton Acceleration Associated With Io's Footprint Tail

G. Clark, B. H. Mauk, P. Kollmann, J. R. Szalay, A. H. Sulaiman, D. J. Gershman, J. Saur, S. Janser, K. Garcia-Sage, T. Greathouse, C. Paranicas, F. Allegrini, F. Bagenal, S. J. Bolton, J. E.P. Connerney, R. W. Ebert, G. Hospodarsky, D. Haggerty, V. Hue, M. ImaiS. Kotsiaros, D. J. McComas, A. Rymer, J. Westlake

Astrophysical Sciences

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27 Scopus citations

Abstract

Observations of energetic charged particles associated with Io's footprint (IFP) tail, and likely within or very near the Main Alfvén Wing, during Juno's 12th perijove (PJ) crossing show evidence of intense proton acceleration by wave-particle heating. Measurements made by Juno/JEDI reveal proton characteristics that include pitch angle distributions concentrated along the upward loss cone, broad energy distributions that span ~50 keV to 1 MeV, highly structured temporal/spatial variations in the particle intensities, and energy fluxes as high as ~100 mW/m². Simultaneous measurements of the plasma waves and magnetic field suggest the presence of ion cyclotron waves and transverse Alfvénic fluctuations. We interpret the proton observations as upgoing conics likely accelerated via resonant interactions with ion cyclotron waves. These observations represent the first measurements of ion conics associated with moon-magnetosphere interactions, suggesting energetic ion acceleration plays a more important role in the IFP tail region than previously considered.

Original language	English (US)
Article number	e2020GL090839
Journal	Geophysical Research Letters
Volume	47
Issue number	24
DOIs	https://doi.org/10.1029/2020GL090839
State	Published - Dec 28 2020

All Science Journal Classification (ASJC) codes

Geophysics
General Earth and Planetary Sciences

Keywords

Juno
Jupiter
aurora
ion conics
proton acceleration
wave-particle interactions

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10.1029/2020GL090839

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Clark, G., Mauk, B. H., Kollmann, P., Szalay, J. R., Sulaiman, A. H., Gershman, D. J., Saur, J., Janser, S., Garcia-Sage, K., Greathouse, T., Paranicas, C., Allegrini, F., Bagenal, F., Bolton, S. J., Connerney, J. E. P., Ebert, R. W., Hospodarsky, G., Haggerty, D., Hue, V., ... Westlake, J. (2020). Energetic Proton Acceleration Associated With Io's Footprint Tail. Geophysical Research Letters, 47(24), Article e2020GL090839. https://doi.org/10.1029/2020GL090839

@article{a546a2a0251e4ae29199fea29fff37ea,

title = "Energetic Proton Acceleration Associated With Io's Footprint Tail",

abstract = "Observations of energetic charged particles associated with Io's footprint (IFP) tail, and likely within or very near the Main Alfv{\'e}n Wing, during Juno's 12th perijove (PJ) crossing show evidence of intense proton acceleration by wave-particle heating. Measurements made by Juno/JEDI reveal proton characteristics that include pitch angle distributions concentrated along the upward loss cone, broad energy distributions that span ~50 keV to 1 MeV, highly structured temporal/spatial variations in the particle intensities, and energy fluxes as high as ~100 mW/m2. Simultaneous measurements of the plasma waves and magnetic field suggest the presence of ion cyclotron waves and transverse Alfv{\'e}nic fluctuations. We interpret the proton observations as upgoing conics likely accelerated via resonant interactions with ion cyclotron waves. These observations represent the first measurements of ion conics associated with moon-magnetosphere interactions, suggesting energetic ion acceleration plays a more important role in the IFP tail region than previously considered.",

keywords = "Juno, Jupiter, aurora, ion conics, proton acceleration, wave-particle interactions",

author = "G. Clark and Mauk, {B. H.} and P. Kollmann and Szalay, {J. R.} and Sulaiman, {A. H.} and Gershman, {D. J.} and J. Saur and S. Janser and K. Garcia-Sage and T. Greathouse and C. Paranicas and F. Allegrini and F. Bagenal and Bolton, {S. J.} and Connerney, {J. E.P.} and Ebert, {R. W.} and G. Hospodarsky and D. Haggerty and V. Hue and M. Imai and S. Kotsiaros and McComas, {D. J.} and A. Rymer and J. Westlake",

note = "Publisher Copyright: {\textcopyright}2020. American Geophysical Union. All Rights Reserved. This article has been contributed to by US Government employees and their work is in the public domain in the USA.",

year = "2020",

month = dec,

day = "28",

doi = "10.1029/2020GL090839",

language = "English (US)",

volume = "47",

journal = "Geophysical Research Letters",

issn = "0094-8276",

publisher = "John Wiley and Sons Inc.",

number = "24",

}

Clark, G, Mauk, BH, Kollmann, P, Szalay, JR, Sulaiman, AH, Gershman, DJ, Saur, J, Janser, S, Garcia-Sage, K, Greathouse, T, Paranicas, C, Allegrini, F, Bagenal, F, Bolton, SJ, Connerney, JEP, Ebert, RW, Hospodarsky, G, Haggerty, D, Hue, V, Imai, M, Kotsiaros, S, McComas, DJ, Rymer, A & Westlake, J 2020, 'Energetic Proton Acceleration Associated With Io's Footprint Tail', Geophysical Research Letters, vol. 47, no. 24, e2020GL090839. https://doi.org/10.1029/2020GL090839

TY - JOUR

T1 - Energetic Proton Acceleration Associated With Io's Footprint Tail

AU - Clark, G.

AU - Mauk, B. H.

AU - Kollmann, P.

AU - Szalay, J. R.

AU - Sulaiman, A. H.

AU - Gershman, D. J.

AU - Saur, J.

AU - Janser, S.

AU - Garcia-Sage, K.

AU - Greathouse, T.

AU - Paranicas, C.

AU - Allegrini, F.

AU - Bagenal, F.

AU - Bolton, S. J.

AU - Connerney, J. E.P.

AU - Ebert, R. W.

AU - Hospodarsky, G.

AU - Haggerty, D.

AU - Hue, V.

AU - Imai, M.

AU - Kotsiaros, S.

AU - McComas, D. J.

AU - Rymer, A.

AU - Westlake, J.

PY - 2020/12/28

Y1 - 2020/12/28

N2 - Observations of energetic charged particles associated with Io's footprint (IFP) tail, and likely within or very near the Main Alfvén Wing, during Juno's 12th perijove (PJ) crossing show evidence of intense proton acceleration by wave-particle heating. Measurements made by Juno/JEDI reveal proton characteristics that include pitch angle distributions concentrated along the upward loss cone, broad energy distributions that span ~50 keV to 1 MeV, highly structured temporal/spatial variations in the particle intensities, and energy fluxes as high as ~100 mW/m2. Simultaneous measurements of the plasma waves and magnetic field suggest the presence of ion cyclotron waves and transverse Alfvénic fluctuations. We interpret the proton observations as upgoing conics likely accelerated via resonant interactions with ion cyclotron waves. These observations represent the first measurements of ion conics associated with moon-magnetosphere interactions, suggesting energetic ion acceleration plays a more important role in the IFP tail region than previously considered.

AB - Observations of energetic charged particles associated with Io's footprint (IFP) tail, and likely within or very near the Main Alfvén Wing, during Juno's 12th perijove (PJ) crossing show evidence of intense proton acceleration by wave-particle heating. Measurements made by Juno/JEDI reveal proton characteristics that include pitch angle distributions concentrated along the upward loss cone, broad energy distributions that span ~50 keV to 1 MeV, highly structured temporal/spatial variations in the particle intensities, and energy fluxes as high as ~100 mW/m2. Simultaneous measurements of the plasma waves and magnetic field suggest the presence of ion cyclotron waves and transverse Alfvénic fluctuations. We interpret the proton observations as upgoing conics likely accelerated via resonant interactions with ion cyclotron waves. These observations represent the first measurements of ion conics associated with moon-magnetosphere interactions, suggesting energetic ion acceleration plays a more important role in the IFP tail region than previously considered.

KW - Juno

KW - Jupiter

KW - aurora

KW - ion conics

KW - proton acceleration

KW - wave-particle interactions

UR - http://www.scopus.com/inward/record.url?scp=85096535369&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85096535369&partnerID=8YFLogxK

U2 - 10.1029/2020GL090839

DO - 10.1029/2020GL090839

M3 - Article

AN - SCOPUS:85096535369

SN - 0094-8276

VL - 47

JO - Geophysical Research Letters

JF - Geophysical Research Letters

IS - 24

M1 - e2020GL090839

ER -

Energetic Proton Acceleration Associated With Io's Footprint Tail

Abstract

All Science Journal Classification (ASJC) codes

Keywords

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