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See detailJovian auroral spectroscopy with FUSE: analysis of self-absorption and implications for electron precipitation
Gustin, Jacques ULg; Feldman, Paul D.; Gérard, Jean-Claude ULg et al

in Icarus: International Journal of Solar System Studies (2004), 171(2), 336-355

High-resolution (similar to 0.22 Angstrom) spectra of the north jovian aurora were obtained in the 905-1180 Angstrom window with the Far Ultraviolet Spectroscopic Explorer (FUSE) on October 28, 2000. The ... [more ▼]

High-resolution (similar to 0.22 Angstrom) spectra of the north jovian aurora were obtained in the 905-1180 Angstrom window with the Far Ultraviolet Spectroscopic Explorer (FUSE) on October 28, 2000. The FUSE instrument resolves the rotational structure of the H-2 spectra and the spectral range allows the study of self-absorption. Below 1100 Angstrom, transitions connecting to the upsilon" less than or equal to 2 levels of the H-2 ground state are partially or totally absorbed by the overlying H2 molecules. The FUSE spectra provide information on the overlying H2 column and on the vibrational distribution of H-2. Transitions from high-energy H-2 Rydberg states and treatment of self-absorption are considered in our synthetic spectral generator. We show comparisons between synthetic and observed spectra in the 920-970, 1030-1080, and 1090-1180 Angstrom spectral windows. In a first approach (single-layer model), the synthetic spectra are venerated in a thin emitting layer and the emerging photons are absorbed by a layer located above the source. It is found that the parameters of the single-layer model best fitting the three spectral windows are 850, 800, and 800 K respectively for the H-2 gas temperature and 1.3 x 10(18), 1.5 x 10(20), and 1.3 x 10(20) cm(-2) for the H-2 self-absorbing vertical column respectively. Comparison between the H-2 column and a 1-D atmospheric model indicates that the short-wavelength FUV auroral emission originates from just above the homopause. This is confirmed by the high H-2 rovibrational temperatures, close to those deduced from spectral analyses of H-3(+) auroral emission. In a second approach, the synthetic spectral generator is coupled with a vertically distributed 3 energy degradation model, where the only input is the energy distribution of incoming electrons (multi-layer model). The model that best fits globally the three FUSE spectra is a sum of Maxwellian functions, with characteristic energies ranging from 1 to 100 keV, giving rise to an emission peak located at 5 mubar, that is similar to 100 km below the methane homopause. This multi-layer model is also applied to a re-analysis of the Hopkins Ultraviolet Telescope (HUT) auroral spectrum and accounts for the H2 self-absorption as well as the methane absorption. It is found that no additional discrete soft electron precipitation is necessary to fit either the FUSE or the HUT observations. (C) 2004 Elsevier Inc. All rights reserved. [less ▲]

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See detailJovian ion energy spectra - Ion stochastic acceleration by Alfven waves
Radioti, Aikaterini ULg; Krupp, N.; Woch, J. et al

Conference (2005)

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See detailJovian thermal structure inferred from the energy degradation of auroral electrons
Grodent, Denis ULg; Gérard, Jean-Claude ULg; Waite, J. H.

in Bulletin of the American Astronomical Society (1999, October 10)

A one--dimensional model has been developed to investigate the links between auroral heat input and the atmospheric temperature and composition structure of Jupiter. Different energy distributions are ... [more ▼]

A one--dimensional model has been developed to investigate the links between auroral heat input and the atmospheric temperature and composition structure of Jupiter. Different energy distributions are used to evaluate the importance of the energy spectrum of the incident electrons for the thermal balance of Jupiter's auroral thermosphere. Radiative cooling by H_3(+) and hydrocarbon (CH_4, C_2H_2) and downward conduction are calculated to solve the heat conduction equation. The values of observable quantities such as the altitude of the H_2 emission peak, infrared (IR) and ultraviolet (UV) emissions and temperatures associated with H_2 and H_3(+) optical signatures are used to constrain the parameters of the auroral electron energy distributions. From these simulations, it appears that the precipitated auroral energy is not able to directly provide the necessary heat to balance the hydrocarbon cooling below the homopause. It is suggested however that the auroral upper stratosphere is warmer than the equatorial upper stratosphere measured by Galileo. A Maxwellian energy distribution with a total flux of 20 ergs cm(-2) s(-1) and a characteristic energy of 22 keV added to a soft Maxwellian component of 1 erg cm(-2) s(-1) and 350 eV produces results in good agreement with thermospheric observations. [less ▲]

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See detailJovian thermal structure inferred from the energy degradation of auroral electrons.
Grodent, Denis ULg; Gérard, Jean-Claude ULg; Waite, J H, Jr

in Bulletin of the American Astronomical Society (1999)

Detailed reference viewed: 12 (8 ULg)
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See detailJoyaux cosmiques - 01/2015
Manfroid, Jean ULg

Article for general public (2015)

Jupiter en cyclope - Mars et la comète Siding Spring -L'amas ouvert NGC3532

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See detailJoyaux cosmiques - 02/2015
Manfroid, Jean ULg

Article for general public (2015)

M31 - Messier 16 et les Piliers de la création -LDN 483, un trou dans le ciel

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See detailJoyaux cosmiques - 03/2015
Manfroid, Jean ULg

Article for general public (2015)

Le globule CG4 - La Tête de Cheval - La Nébuleuse Trifide -Smiley cosmique

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See detailJoyaux cosmiques - 04/2015
Manfroid, Jean ULg

Article for general public (2015)

L'association Ara OB1

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See detailJoyaux cosmiques - 05/2015
Manfroid, Jean ULg

Article for general public (2015)

Anneau d'Einstein - L'amas globulaire M22 - La galaxie NGC 3021 -La galaxie NGC 5023

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See detailJoyaux cosmiques - 06/2015
Manfroid, Jean ULg

Article for general public (2015)

Piliers de la Création en 3D - Les 25ans de Hubble - Le Casque de Thor

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See detailJoyaux cosmiques - 09/2015
Manfroid, Jean ULg

Article for general public (2015)

NGC 2367 - RCW 34 - Sh 2-274

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See detailJoyaux cosmiques - 10/2015
Manfroid, Jean ULg

Article for general public (2015)

ESO 378-1 - Amas IC 4651 -Recyclage cosmique - M2-9

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See detailJoyaux cosmiques - 11/2015
Manfroid, Jean ULg

Article for general public (2015)

Éclipse double et triple - La galaxie naine du Sculpteur -M17

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See detailJoyaux cosmiques - 12/2015
Manfroid, Jean ULg

Article for general public (2015)

NGC 3521 - Le Sac de Charbon - L’Univers jeune

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See detailLa joyeuse rentrée de l'eLearning
Verpoorten, Dominique ULg

Article for general public (2013)

Message clé : il faut s'intéresser aux moocs pour les chances et les menaces dont ils sont porteurs MAIS ils ne représentent pas le tout de l'eLearning

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See detailJPEG 2000
Van Droogenbroeck, Marc ULg

Learning material (2001)

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See detailJuan Gabriel Vásquez: découvrir pourquoi ce qui est obscur continue de l'être
Vanden Berghe, Kristine ULg

Article for general public (2014)

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See detailJuan José Saer, comentador de las versiones del Ulises
Willson, Patricia ULg

in Barnabé, Jean-Philippe; Vegh, Beatriz (Eds.) Proust y Joyce en ámbitos rioplatenses (2007)

The interpretation of the Spanish translations of Joyce’s Ulysses made by the Argentine writer Juan José Saer is the starting point for the elaboration of a series of topics related to literary import in ... [more ▼]

The interpretation of the Spanish translations of Joyce’s Ulysses made by the Argentine writer Juan José Saer is the starting point for the elaboration of a series of topics related to literary import in general and translation in Argentina in particular. In the first place, the influence exercised by the early versions of canonical literary texts in a specific literature; in the second place, the defence of the own dialectal variety when evaluating a translation. Finally, the view on a golden age of translation in Argentina is addressed, which implies not only to evaluate Santiago Rueda’s publishing project –where José Salas Subirat’s Ulysses was first published− during the 1940s, but also the reception of its translations among young artists and writers during the 1960s. [less ▲]

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See detailJuan Luis Vives, Introductio ad Sapientiam. Satellitium sive Symbola. Epistolae duae de ratione studii puerilis
Adam, Renaud ULg

in De Schepper, Marcus; Kelders, Ann; Pauwels, Jan (Eds.) In de ban van boeken. Grote verzamelaars uit de negentiende eeuw in de Koninklijke Bibliotheek van België (2008)

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See detailJuan Ramon Jiménez: vie et oeuvre d'un Prix Nobel
Dechêne, Antoine ULg

Article for general public (2011)

Detailed reference viewed: 17 (3 ULg)