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Communication Dans Un Congrès Année : 2019

Features of emission cone of Jovian decameter radiation and observation of Jupiter's magnetic field by JUNO

Résumé

A new magnetic field model for Jupiter, based on Juno's first nine orbits observations, JRM09, was recently proposed by Connerney et al. [Geophys. Res. Lett., 45, 2590-2596, 2018]. We use this model to investigate the angular distribution of the Jovian decameter radiation occurrence probability, relatively to the local magnetic field B and its gradient ∇B in the source region, and we compare the results to those obtained several years ago using older models (O6, VIP4, VIT4 and VIPAL). The JRM09 model confirms the former results: the radio emission is beamed in a hollow cone presenting a flattening in a specific direction. The same assumptions were made as in the previous studies: the Jovian decameter radiation is supposed to be produced by the cyclotron maser instability (CMI) in a plasma where B and ∇B are not parallel. As a consequence, the emission cone does not have any axial symmetry and then presents a flattening in a privileged direction. This flattening appears to be more important for the northern emission (34.8%) than for the southern emission (12.5%) probably due to the fact that the angle between the directions of B and ∇B is greater in the North (∼ 10∘) than in the South (∼ 4∘).
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Dates et versions

insu-04476316 , version 1 (24-02-2024)

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Patrick H. M. Galopeau, Mohammed Boudjada. Features of emission cone of Jovian decameter radiation and observation of Jupiter's magnetic field by JUNO. 21st EGU General Assembly, EGU2019, Apr 2021, Vienna, Austria. pp.id.11692. ⟨insu-04476316⟩
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