Latitudinal beaming of Jovian decametric radio emissions as viewed from Juno and the Nançay Decameter Array

Masafumi Imai; William S. Kurth; George B. Hospodarsky; Scott J. Bolton; John E. P. Connerney; Steven M. Levin; Alain Lecacheux; Laurent Lamy; Philippe Zarka

doi:10.1002/2016GL072454

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Latitudinal beaming of Jovian decametric radio emissions as viewed from Juno and the Nançay Decameter Array

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Latitudinal beaming of Jovian decametric radio emissions as viewed from Juno and the Nançay Decameter Array

Masafumi Imai, William S. Kurth, George B. Hospodarsky, Scott J. Bolton, John E. P. Connerney, Steven M. Levin, Alain Lecacheux, Laurent Lamy and Philippe Zarka

Geophysical research letters, Vol.44(10), pp.4455-4462

05/28/2017

DOI: 10.1002/2016GL072454

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Abstract

Two well‐defined Jovian decametric radio arcs were observed at latitudinal separations of 11°–16° from the Juno spacecraft near Jupiter and the Nançay Decameter Array (NDA) at Earth on 17 May and 25 August 2016. These discrete arcs are from the so‐called A source covering both Io‐related and non‐Io‐related emissions. By measuring the wave arrival time at two distant observers with propagation time correction, the remaining delay times are 92.8 ± 1.3 min for the first arc and 116.0 ± 1.2 min for the second arc. This implies that both radio sources are not controlled by the orbital motion of Io but Jupiter's rotation itself. The geometrical information for Juno and NDA and the loss cone‐driven electron cyclotron maser instability theory provide these radio sources that are located at about 173° ± 10° in system III longitude projected onto Jupiter's north surface and imply resonant electron energy ranges from 0.5 to 11 keV. Key Points Two decametric (DAM) arcs were observed from widely spaced latitudes by Juno and NDA Direct evidence of long‐lasting DAM arcs corotating with Jupiter is presented The loss cone‐driven CMI theory of fundamental X‐mode emission provides a constraint of the concurrent arcs

decametric radio emissions

Juno

Jupiter

NDA

stereoscopic observations

waves

Details

Title: Subtitle: Latitudinal beaming of Jovian decametric radio emissions as viewed from Juno and the Nançay Decameter Array
Creators: Masafumi Imai - University of Iowa
William S. Kurth - University of Iowa
George B. Hospodarsky - University of Iowa
Scott J. Bolton - Southwest Research Institute
John E. P. Connerney - Goddard Space Flight Center
Steven M. Levin - Jet Propulsion Laboratory
Alain Lecacheux - Observatoire de Paris
Laurent Lamy - Observatoire de Paris
Philippe Zarka - Laboratoire d’études spatiales et d’instrumentation en astrophysique
Resource Type: Journal article
Publication Details: Geophysical research letters, Vol.44(10), pp.4455-4462
DOI: 10.1002/2016GL072454
ISSN: 0094-8276
eISSN: 1944-8007
Number of pages: 8
Grant note: Fund for Astrophysical Research (F.A.R.) (None) NASA through Southwest Research Institute (699041X)
Language: English
Date published: 05/28/2017
Academic Unit: Physics and Astronomy
Record Identifier: 9984455548602771

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