Ganymede‐Induced Decametric Radio Emission: In Situ Observations and Measurements by Juno

C. Louis; P. Louarn; F. Allegrini; W. Kurth; J. Szalay

doi:10.1029/2020GL090021

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Ganymede‐Induced Decametric Radio Emission: In Situ Observations and Measurements by Juno

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Ganymede‐Induced Decametric Radio Emission: In Situ Observations and Measurements by Juno

C. Louis, P. Louarn, F. Allegrini, W. Kurth and J. Szalay

Geophysical research letters, Vol.47(20), e2020GL090021

10/28/2020

DOI: 10.1029/2020GL090021

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Abstract

At Jupiter, part of the auroral radio emissions are induced by the Galilean moons Io, Europa and Ganymede. Until now, they have been remotely detected, using ground-based radio-telescopes or electric antennas aboard spacecraft. The polar trajectory of the Juno orbiter allows the spacecraft to cross the magnetic flux tubes connected to these moons, or their tail, and gives a direct measure of the characteristics of these decametric moon–induced radio emissions. In this study, we focus on the detection of a radio emission during the crossing of magnetic field lines connected to Ganymede’s tail. Using electromagnetic waves (Juno/Waves) and in-situ electron measurements (Juno/JADE-E), we estimate the flux tube width to be a few 100 km, a radio emission growth rate > 3×10−4, an electron population of energy E = 4 − 15 keV and an emission beaming angle of θ = 76◦ − 83◦ , at a frequency ∼ 1.005 − 1.021 × fce. We also confirmed that radio emission is associated with Ganymede’s down-tail far-ultraviolet emission

Astrophysics

Sciences of the Universe

Details

Title: Subtitle: Ganymede‐Induced Decametric Radio Emission: In Situ Observations and Measurements by Juno
Creators: C. Louis - Université Fédérale de Toulouse Midi-Pyrénées
P. Louarn - Université Toulouse III - Paul Sabatier
F. Allegrini - Southwest Research Institute
W. Kurth - University of Iowa
J. Szalay - Princeton University
Resource Type: Journal article
Publication Details: Geophysical research letters, Vol.47(20), e2020GL090021
DOI: 10.1029/2020GL090021
ISSN: 0094-8276
eISSN: 1944-8007
Publisher: American Geophysical Union
Grant note: DOI: 10.13039/100000104, name: National Aeronautics and Space Administration, award: 699041X
Language: English
Date published: 10/28/2020
Academic Unit: Physics and Astronomy
Record Identifier: 9984455265702771

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