Morphology of the Auroral Tail of Io, Europa, and Ganymede From JIRAM L‐Band Imager

Autor: Federico Tosi, Vincent Hue, Bianca Maria Dinelli, Raffaella Noschese, Roberto Sordini, Giuseppe Sindoni, Francesca Altieri, Stavro Ivanovski, Vincent Dols, Alessandro Moirano, Jamey Szalay, Christina Plainaki, Gianrico Filacchione, Scott Bolton, Jack H. Waite, Ali Sulaiman, Davide Grassi, Stefano Massetti, Alberto Adriani, Andrea Cicchetti, Alessandro Mura, Robert L. Lysak, Maria Luisa Moriconi, Bertrand Bonfond, Giuseppe Piccioni, Diego Turrini, Alessandra Migliorini
Rok vydání: 2021
Předmět:
Zdroj: Journal of geophysical research. Space physics
(2021): e2021JA029450. doi:10.1029/2021JA029450
info:cnr-pdr/source/autori:Alessandro Moirano1, Alessandro Mura1, Alberto Adriani1, Vincent Dols2, Bertrand Bonfond3, Jack H. Waite4,5, Vincent Hue4, Jamey R. Szalay6, Ali H. Sulaiman7, Bianca M. Dinelli8, Federico Tosi1, Francesca Altieri1, Andrea Cicchetti1, Gianrico Filacchione1, Davide Grassi1, Alessandra Migliorini1, Maria L. Moriconi8, Raffaella Noschese1, Giuseppe Piccioni1, Roberto Sordini1, Diego Turrini1, Christina Plainaki9, Giuseppe Sindoni9, Stefano Massetti1, Robert L. Lysak10, Stavro L. Ivanovski11, and Scott J. Bolton4/titolo:Morphology of the Auroral Tail of Io, Europa, and Ganymede From JIRAM L-Band Imager/doi:10.1029%2F2021JA029450/rivista:Journal of geophysical research. Space physics (Print)/anno:2021/pagina_da:/pagina_a:e2021JA029450/intervallo_pagine:e2021JA029450/volume
ISSN: 2169-9402
2169-9380
DOI: 10.1029/2021ja029450
Popis: Jupiter hosts intense auroral activity associated with charged particles precipitating into the planet's atmosphere. The Galilean moons orbiting within the magnetosphere are swept by the magnetic field: the resulting perturbation travels along field lines as Alfven waves, which are able to accelerate electrons towards the planet, producing satellite-induced auroral emissions. These emissions due to the moons, known as footprints, can be detected in various wavelengths (UV, visible, IR) outside the main auroral emission as multiple bright spots followed by footprint tails. Since 2016 the Juno spacecraft orbiting Jupiter has surveyed the polar regions more than 30 times at close distances. Onboard the spacecraft, the Jovian InfraRed Auroral Mapper (JIRAM) is an imager and spectrometer with an L-band imaging filter suited to observe auroral features at unprecedented spatial resolution. JIRAM revealed a rich substructure in the footprint tails of Io, Europa and Ganymede, which appear as a trail of quasi-regularly spaced bright sub-dots whose intensity fades away along the emission trail as the spatial separation from the footprint increases. The fine structure of the Europa and Ganymede footprint tails is reported in this work for the first time. We will also show that the typical distance between subsequent sub-dots is the same for all three moons at JIRAM resolution in both hemispheres. In addition, the sub-dots observed by JIRAM are static in a frame corotating with Jupiter. A feedback mechanism between the ionosphere and the magnetosphere is suggested as a potential candidate to explain the morphology of the footprint tails.
Databáze: OpenAIRE
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