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  Solving non-LTE problems in rotational transitions using the Gauss–Seidel method and its implementation in the Atmospheric Radiative Transfer Simulator

Yamada, T., Rezac, L., Larsson, R., Hartogh, P., Yoshida, N., & Kasai, Y. (2018). Solving non-LTE problems in rotational transitions using the Gauss–Seidel method and its implementation in the Atmospheric Radiative Transfer Simulator. Astronomy and Astrophysics, 619: A181. doi:10.1051/0004-6361/201833566.

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Genre: Zeitschriftenartikel

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externe Referenz:
http://adsabs.harvard.edu/abs/2018A%26A...619A.181Y (Zusammenfassung)
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 Urheber:
Yamada, T., Autor
Rezac, Ladislav1, Autor           
Larsson, R.1, Autor
Hartogh, Paul1, Autor           
Yoshida, N., Autor
Kasai, Y., Autor
Affiliations:
1Department Planets and Comets, Max Planck Institute for Solar System Research, Max Planck Society, ou_1832288              

Inhalt

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Schlagwörter: radiative transfer / methods: numerical / submillimeter: planetary systems / planets and satellites: atmospheres
 MPIS_PROJECTS: JUICE: SWI
 MPIS_PROJECTS: ROSETTA: MIRO
 Zusammenfassung: This article presents our implementation of a non-LTE solver in spherical symmetry for molecular rotational transition in static or expanding atmospheres. The new open-source code relies on the Gauss–Seidel Accelerated Lambda Iteration methodology that provides a rapid and accurate convergence of the non-LTE problems, which is now routinely used in astrophysical and planetary research. The non-LTE code is interfaced with the widely used package, the Atmospheric Radiative Transfer Simulator (ARTS), to facilitate spectral line simulations for various viewing geometries. In this paper we describe the numerical implementation, provide the first validation results for the populations against two other non-LTE codes, and then discuss the possible application. The quantitative comparisons are performed using an established ortho-water non-LTE model applied to cases of optical thick and thin conditions of Ganymede’s atmosphere. The differences in populations expressed as excitation temperatures show very good agreement in both cases. Finally, we also apply this model to a sample of data from the Microwave Instrument for the Rosetta Orbiter (MIRO) instrument. The new non-LTE package is demonstrated to be fast and accurate, and we hope that it will be a useful addition to the planetary community. In addition, being open source and part of the ARTS, it will be further improved and developed.

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Sprache(n): eng - English
 Datum: 2018-12-042018
 Publikationsstatus: Online veröffentlicht
 Seiten: -
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: Expertenbegutachtung
 Identifikatoren: DOI: 10.1051/0004-6361/201833566
 Art des Abschluß: -

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Titel: Astronomy and Astrophysics
  Andere : Astron. Astrophys.
Genre der Quelle: Zeitschrift
 Urheber:
Affiliations:
Ort, Verlag, Ausgabe: Berlin : Springer-Verlag
Seiten: - Band / Heft: 619 Artikelnummer: A181 Start- / Endseite: - Identifikator: ISSN: 0004-6361
CoNE: https://pure.mpg.de/cone/journals/resource/954922828219_1