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  Solar polarimetry in the K I D2 line : A novel possibility for a stratospheric balloon

Quintero Noda, C., Villanueva, G. L., Katsukawa, Y., Solanki, S. K., Orozco Suárez, D., Ruiz Cobo, B., et al. (2018). Solar polarimetry in the K I D2 line: A novel possibility for a stratospheric balloon. Astronomy and Astrophysics, 610: A79. doi:10.1051/0004-6361/201732111.

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Genre: Zeitschriftenartikel
Andere : Solar polarimetry in the K I D2line : A novel possibility for a stratospheric balloon

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Urheber

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 Urheber:
Quintero Noda, C. , Autor
Villanueva, G. L., Autor
Katsukawa, Y., Autor
Solanki, Sami K.1, 2, Autor           
Orozco Suárez, D. , Autor
Ruiz Cobo, B. , Autor
Shimizu, T., Autor
Oba, T., Autor
Kubo, M., Autor
Anan, T., Autor
Ichimoto, K., Autor
Suematsu, Y., Autor
Affiliations:
1Department Sun and Heliosphere, Max Planck Institute for Solar System Research, Max Planck Society, ou_1832289              
2ERC Advanced Grant: Solar magnetic field and its influence on solar variability and activity (SOLMAG), Max Planck Institute for Solar System Research, Max Planck Society, ou_3164813              

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Schlagwörter: Sun: magnetic fields / techniques: polarimetric / atmospheric effects / balloons
 Zusammenfassung: Of the two solar lines, K I D1 and D2, almost all attention so far has been devoted to the D1 line, as D2 is severely affected by an O2 atmospheric band. This, however, makes the latter appealing for balloon and space observations from above (most of) the Earth’s atmosphere. We estimate the residual effect of the O2 band on the K I D2 line at altitudes typical for stratospheric balloons. Our aim is to study the feasibility of observing the 770 nm window. Specifically, this paper serves as a preparation for the third flight of the Sunrise balloon-borne observatory. The results indicate that the absorption by O2 is still present, albeit much weaker, at the expected balloon altitude. We applied the obtained O2 transmittance to K I D2 synthetic polarimetric spectra and found that in the absence of line-of-sight motions, the residual O2 has a negligible effect on the K I D2 line. On the other hand, for Doppler-shifted K I D2 data, the residual O2 might alter the shape of the Stokes profiles. However, the residual O2 absorption is sufficiently weak at stratospheric levels that it can be divided out if appropriate measurements are made, something that is impossible at ground level. Therefore, for the first time with Sunrise III, we will be able to perform polarimetric observations of the K I D2 line and, consequently, we will have improved access to the thermodynamics and magnetic properties of the upper photosphere from observations of the K I lines.

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Sprache(n): eng - English
 Datum: 2018-12-272018
 Publikationsstatus: Online veröffentlicht
 Seiten: -
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: Expertenbegutachtung
 Identifikatoren: DOI: 10.1051/0004-6361/201732111
 Art des Abschluß: -

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Projektinformation

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Projektname : ERC-2015-AdG - SOLMAG
Grant ID : 695075
Förderprogramm : Horizon 2020 (H2020)
Förderorganisation : European Commission (EC)

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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: 610 Artikelnummer: A79 Start- / Endseite: - Identifikator: ISSN: 0004-6361
CoNE: https://pure.mpg.de/cone/journals/resource/954922828219_1