On the Relation Between Jovian Aurorae and the Loading/Unloading of the Magnetic Flux : Simultaneous Measurements From Juno, Hubble Space Telescope, and Hisaki

Yao, Z.H. and Grodent, D. and Kurth, W.S. and Clark, G. and Mauk, B.H. and Kimura, T. and Bonfond, B. and Ye, S.-Y. and Lui, A.T. and Radioti, A. and Palmaerts, B. and Dunn, W.R. and Ray, L.C. and Bagenal, F. and Badman, S.V. and Rae, I.J. and Guo, R.L. and Pu, Z.Y. and Gérard, J.-C. and Yoshioka, K. and Nichols, J.D. and Bolton, S.J. and Levin, S.M. (2019) On the Relation Between Jovian Aurorae and the Loading/Unloading of the Magnetic Flux : Simultaneous Measurements From Juno, Hubble Space Telescope, and Hisaki. Geophysical Research Letters, 46 (21). pp. 11632-11641. ISSN 0094-8276

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Abstract

We present simultaneous observations of aurorae at Jupiter from the Hubble Space Telescope and Hisaki, in combination with the in situ measurements of magnetic field, particles, and radio waves from the Juno Spacecraft in the outer magnetosphere, from ~ 80RJ to 60RJ during 17 to 22 March 2017. Two cycles of accumulation and release of magnetic flux, named magnetic loading/unloading, were identified during this period, which correlate well with electron energization and auroral intensifications. Magnetic reconnection events are identified during both the loading and unloading periods, indicating that reconnection and unloading are independent processes. These results show that the dynamics in the middle magnetosphere are coupled with auroral variability.