Clark, G., Tao, C., Mauk, B. H., Nichols, J., Saur, J., Bunce, E. J., Allegrini, F., Gladstone, R., Bagenal, F., Bolton, S., Bonfond, B., Connerney, J., Ebert, R. W., Gershman, D. J., Haggerty, D., Kimura, T., Kollmann, P., Kotsiaros, S., Kurth, W. S., Levin, S., McComas, D. J., Murakami, G., Paranicas, C., Rymer, A. and Valek, P. (2018). Precipitating Electron Energy Flux and Characteristic Energies in Jupiter's Main Auroral Region as Measured by Juno/JEDI. J. Geophys. Res-Space Phys., 123 (9). S. 7554 - 7568. WASHINGTON: AMER GEOPHYSICAL UNION. ISSN 2169-9402

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Abstract

The relationship between electron energy flux and the characteristic energy of electron distributions in the main auroral loss cone bridges the gap between predictions made by theory and measurements just recently available from Juno. For decades such relationships have been inferred from remote sensing observations of the Jovian aurora, primarily from the Hubble Space Telescope, and also more recently from Hisaki. However, to infer these quantities, remote sensing techniques had to assume properties of the Jovian atmospheric structure-leading to uncertainties in their profile. Juno's arrival and subsequent auroral passes have allowed us to obtain these relationships unambiguously for the first time, when the spacecraft passes through the auroral acceleration region. Using Juno/Jupiter Energetic particle Detector Instrument (JEDI), an energetic particle instrument, we present these relationships for the 30-keV to 1-MeV electron population. Observations presented here show that the electron energy flux in the loss cone is a nonlinear function of the characteristic or mean electron energy and supports both the predictions from Knight (1973, https://doi.org/10.1016/0032-0633(73)90093-7) and magnetohydrodynamic turbulence acceleration theories (e.g., Saur et al., 2003, https://doi.org/10.1029/2002GL015761). Finally, we compare the in situ analyses of Juno with remote Hisaki observations and use them to help constrain Jupiter's atmospheric profile. We find a possible solution that provides the best agreement between these data sets is an atmospheric profile that more efficiently transports the hydrocarbons to higher altitudes. If this is correct, it supports the previously published idea (e.g., Parkinson et al., 2006, https://doi.org/10.1029/2005JE002539) that precipitating electrons increase the hydrocarbon eddy diffusion coefficients in the auroral regions.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Clark, G.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Tao, C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Mauk, B. H.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Nichols, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Saur, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Bunce, E. J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Allegrini, F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Gladstone, R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Bagenal, F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Bolton, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Bonfond, B.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Connerney, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ebert, R. W.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Gershman, D. J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Haggerty, D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kimura, T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kollmann, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kotsiaros, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kurth, W. S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Levin, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
McComas, D. J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Murakami, G.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Paranicas, C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Rymer, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Valek, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-173697
DOI: 10.1029/2018JA025639
Journal or Publication Title: J. Geophys. Res-Space Phys.
Volume: 123
Number: 9
Page Range: S. 7554 - 7568
Date: 2018
Publisher: AMER GEOPHYSICAL UNION
Place of Publication: WASHINGTON
ISSN: 2169-9402
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
MIDDLE MAGNETOSPHERE; POLAR-REGIONS; ACCELERATION; BEAMS; JUNO; CURRENTS; OVALMultiple languages
Astronomy & AstrophysicsMultiple languages
Refereed: Yes
URI: http://kups.ub.uni-koeln.de/id/eprint/17369

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