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  First measurements of Jupiter's zonal winds with visible imaging spectroscopy

Gonçalves, I., Schmider, F., Gaulme, P., Morales-Juberías, R., Guillot, T., Rivet, J.-P., et al. (2019). First measurements of Jupiter's zonal winds with visible imaging spectroscopy. Icarus, 319, 795-811. doi:10.1016/j.icarus.2018.10.019.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0003-C8B4-0 Version Permalink: http://hdl.handle.net/21.11116/0000-0004-0261-C
Genre: Journal Article

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 Creators:
Gonçalves, Ivan, Author
Schmider, F.X., Author
Gaulme, Patrick1, Author              
Morales-Juberías, Raúl, Author
Guillot, Tristan, Author
Rivet, Jean-Pierre, Author
Appourchaux, Thierry, Author
Boumier, Patrick, Author
Jackiewicz, Jason, Author
Sato, Bun’ei, Author
Ida, Shigeru, Author
Ikoma, Masahiro, Author
Mékarnia, Djamel, Author
Underwood, Thomas A, Author
Voelz, David, Author
Affiliations:
1Department Solar and Stellar Interiors, Max Planck Institute for Solar System Research, Max Planck Society, ou_1832287              

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Free keywords: Atmospheres Dynamics Instrumentation Spectroscopy Jupiter
 Abstract: We present the first measurements of Jupiter’s wind profile ever obtained with Doppler velocity measurements in the visible. Hitherto, knowledge about atmospheric dynamics has been obtained with cloud-tracking techniques, which consist of tracking visible features from images taken at different dates. However, cloud tracking indicates the motion of large cloud structures, which is an indication of the speed of iso-pressure regions, rather than the speed of the actual atmospheric particles. Doppler imaging is as challenging – motions are usually less than 100 m s – as appealing because it measures the speed of cloud particles instead of large cloud structures. Significant difference could appear in the case of atmospheric waves interfering with cloud structures. Here we present the first scientific results of a Doppler imaging spectrometer that is dedicated to giant-planet seismology and atmospheric dynamics by providing instantaneous line-of-sight-velocity maps of the planets of the solar system. The instrument has been developed in the framework of the projects JOVIAL (Jovian Oscillations through Velocity Images At several Longitudes) and JIVE in NM (Jovian Interiors from Velocimetry Experiment in New Mexico). It is a Fourier transform spectrometer with a fixed optical path difference working in the mid-visible domain, which monitors the position of solar Fraunhofer lines that are reflected in the planets’ upper atmospheres. After describing the instrument principle and the different steps of data reduction, we report measurement of the average zonal wind speed of Jupiter, as a function of latitude, from datasets obtained in 2015 and 2016 with two different telescopes, when the planet was close to its opposition. Our results are consistent between the two years. We compare the results with wind profiles obtained by cloud tracking on HST (Hubble Space Telescope) images taken at the same epoch, and identify a significant discrepancy in the North Equatorial Belt and northern part of the Equatorial Zone.

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Language(s): eng - English
 Dates: 2019
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1016/j.icarus.2018.10.019
 Degree: -

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Title: Icarus
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: Amsterdam : Elsevier B.V.
Pages: - Volume / Issue: 319 Sequence Number: - Start / End Page: 795 - 811 Identifier: ISSN: 0019-1035
CoNE: https://pure.mpg.de/cone/journals/resource/954922645023