Juno's first glimpse of Jupiter's complexity

Bolton, S. J.; Levin, S. M.; Bagenal, F.

doi:10.1002/2017gl074118

Cited by 23 publications

(16 citation statements)

References 38 publications

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“…Since they are all observed simultaneously with HST, they are indirectly providing a global and dynamic picture of the Jovian magnetosphere. This HST campaign completes the local in situ information captured by Juno particles and field instruments and complements the Juno remote sensing instruments (see Bagenal et al, ; Bolton et al, ; Connerney et al, ; Mauk et al, , and references therein, for the Magnetometer, Radio and Plasma Wave Sensor, Jovian Auroral Distributions Experiment, Jupiter Energetic particle Detector Instrument, Jupiter Infrared Auroral Mapper, JunoCam, and Microwave Radiometer instruments), particularly the Ultraviolet Spectrograph (UVS) (Gladstone et al, , ).…”

Section: Introductionmentioning

confidence: 79%

“…The National Aeronautics and Space Administration (NASA) Juno spacecraft began its prime mission on 4 July 2016 when it started orbiting Jupiter on a highly elliptical 53‐day polar trajectory (Bolton et al, ; Connerney et al, ). Near perijove, Juno skims above Jupiter's atmosphere at an altitude as low as 3,500 km above the cloud tops, while at the most distant point of its orbit, Juno reaches distances in excess of 100 RJ (1 RJ = 1 Jupiter Radius = 71,492 km).…”

Section: Introductionmentioning

confidence: 99%

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Jupiter's Aurora Observed With HST During Juno Orbits 3 to 7

et al. 2018

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A large set of observations of Jupiter's ultraviolet aurora was collected with the Hubble Space Telescope concurrently with the NASA‐Juno mission, during an eight‐month period, from 30 November 2016 to 18 July 2017. These Hubble observations cover Juno orbits 3 to 7 during which Juno in situ and remote sensing instruments, as well as other observatories, obtained a wealth of unprecedented information on Jupiter's magnetosphere and the connection with its auroral ionosphere. Jupiter's ultraviolet aurora is known to vary rapidly, with timescales ranging from seconds to one Jovian rotation. The main objective of the present study is to provide a simplified description of the global ultraviolet auroral morphology that can be used for comparison with other quantities, such as those obtained with Juno. This represents an entirely new approach from which logical connections between different morphologies may be inferred. For that purpose, we define three auroral subregions in which we evaluate the auroral emitted power as a function of time. In parallel, we define six auroral morphology families that allow us to quantify the variations of the spatial distribution of the auroral emission. These variations are associated with changes in the state of the Jovian magnetosphere, possibly influenced by Io and the Io plasma torus and by the conditions prevailing in the upstream interplanetary medium. This study shows that the auroral morphology evolved differently during the five ~2 week periods bracketing the times of Juno perijove (PJ03 to PJ07), suggesting that during these periods, the Jovian magnetosphere adopted various states.

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Section: Introductionmentioning

confidence: 79%

Section: Introductionmentioning

confidence: 99%

Jupiter's Aurora Observed With HST During Juno Orbits 3 to 7

et al. 2018

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“…Also, the used instrument suffered from contamination so that not all data are directly usable. More recently, Juno arrived in polar orbit around Jupiter in July 2016 (Bolton et al, ). Figure shows the trajectory in a magnetic frame of the previous missions.…”

Section: In Situ Measurementsmentioning

confidence: 99%

A Physical Model of the Proton Radiation Belts of Jupiter inside Europa's Orbit

et al. 2018

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A physical model of the Jovian trapped protons with kinetic energies higher than 1 MeV inward of the orbit of the icy moon Europa is presented. The model, named Salammbô, takes into account the radial diffusion process, the absorption effect of the Jovian moons, and the Coulomb collisions and charge exchanges with the cold plasma and neutral populations of the inner Jovian magnetosphere. Preliminary modeling of the wave-particle interaction with electromagnetic ion cyclotron waves near the moon Io is also performed. Salammbô is validated against in situ proton measurements of Pioneer 10, Pioneer 11, Voyager 1, Galileo Probe, and Galileo Orbiter. A prominent feature of the MeV proton intensity distribution in the modeled area is the 2 orders of magnitude flux depletion observed in MeV measurements near the orbit of Io. Our simulations reveal that this is not due to direct interactions with the moon or its neutral environment but results from scattering of the protons by electromagnetic ion cyclotron waves.

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“…Since this can be done with a (likely) higher precision by radar technology, it is more important that gravity inversion also enables us to study the boundaries between different layers of the Earth, for example, the Mohorovičić discontinuity, which is the boundary between the crust and the mantle (see, for example, Clauser 2014, Section 1.5). Satellite missions to the Moon (GRAIL, see Zuber et al 2013) and Jupiter (Juno, see Bolton et al 2017;Matousek 2007) also allow for the study of the interior of these celestial bodies.…”

Section: Introductionmentioning

confidence: 99%

A greedy algorithm for nonlinear inverse problems with an application to nonlinear inverse gravimetry

Kontak

Michel

2018

Int J Geomath

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Based on the Regularized Functional Matching Pursuit (RFMP) algorithm for linear inverse problems, we present an analogous iterative greedy algorithm for nonlinear inverse problems, called RFMP_NL. In comparison to established methods for nonlinear inverse problems, the algorithm is able to combine very diverse types of basis functions, for example, localized and global functions. This is important, in particular, in geoscientific applications, where global structures have to be distinguished from local anomalies. Furthermore, in contrast to other methods, the algorithm does not require the solution of large linear systems. We apply the RFMP_NL to the nonlinear inverse problem of gravimetry, where gravitational data are inverted for the shape of the surface or inner layer boundaries of planetary bodies. This inverse problem is described by a nonlinear integral operator, for which we additionally provide the Fréchet derivative. Finally, we present two synthetic numerical examples to show that it is beneficial to apply the presented method to inverse gravimetric problems.

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Juno's first glimpse of Jupiter's complexity

Cited by 23 publications

References 38 publications

Jupiter's Aurora Observed With HST During Juno Orbits 3 to 7

Jupiter's Aurora Observed With HST During Juno Orbits 3 to 7

A Physical Model of the Proton Radiation Belts of Jupiter inside Europa's Orbit

A greedy algorithm for nonlinear inverse problems with an application to nonlinear inverse gravimetry

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