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  CLASP Constraints on the Magnetization and Geometrical Complexity of the Chromosphere-Corona Transition Region

Trujillo Bueno, J., Štěpán, J., Belluzzi, L., Asensio Ramos, A., Manso Sainz, R., del Pino Alemán, T., et al. (2018). CLASP Constraints on the Magnetization and Geometrical Complexity of the Chromosphere-Corona Transition Region. Astrophysical Journal, Letters, 866(1): L15. doi:10.3847/2041-8213/aae25a.

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Trujillo Bueno, J. , Author
Štěpán, J., Author
Belluzzi, L., Author
Asensio Ramos, A. , Author
Manso Sainz, R.1, Author           
del Pino Alemán, T. , Author
Casini, R., Author
Ishikawa, R., Author
Kano, R., Author
Winebarger, A., Author
Auchère, F., Author
Narukage, N., Author
Kobayashi, K., Author
Bando, T., Author
Katsukawa, Y., Author
Kubo, M., Author
Ishikawa, S., Author
Giono, G., Author
Hara, H., Author
Suematsu, Y., Author
Shimizu, T., AuthorSakao, T., AuthorTsuneta, S., AuthorIchimoto, K., AuthorCirtain, J., AuthorChampey, P., AuthorDe Pontieu, B. , AuthorCarlsson, M., Author more..
1Department Sun and Heliosphere, Max Planck Institute for Solar System Research, Max Planck Society, ou_1832289              


Free keywords: magnetic fields; polarization; Sun: transition region; Sun: UV radiation
 Abstract: The Chromospheric Lyman-Alpha Spectro-Polarimeter (CLASP) is a suborbital rocket experiment that on 2015 September 3 measured the linear polarization produced by scattering processes in the hydrogen Lyα line of the solar disk radiation. The line-center photons of this spectral line radiation mostly stem from the chromosphere-corona transition region (TR). These unprecedented spectropolarimetric observations revealed an interesting surprise, namely that there is practically no center-to-limb variation (CLV) in the Q/I line-center signals. Using an analytical model, we first show that the geometric complexity of the corrugated surface that delineates the TR has a crucial impact on the CLV of the Q/I and U/I line-center signals. Second, we introduce a statistical description of the solar atmosphere based on a 3D model derived from a state-of-the-art radiation magnetohydrodynamic simulation. Each realization of the statistical ensemble is a 3D model characterized by a given degree of magnetization and corrugation of the TR, and for each such realization we solve the full 3D radiative transfer problem taking into account the impact of the CLASP instrument degradation on the calculated polarization signals. Finally, we apply the statistical inference method presented in a previous paper to show that the TR of the 3D model that produces the best agreement with the CLASP observations has a relatively weak magnetic field and a relatively high degree of corrugation. We emphasize that a suitable way to validate or refute numerical models of the upper solar chromosphere is by confronting calculations and observations of the scattering polarization in ultraviolet lines sensitive to the Hanle effect.


Language(s): eng - English
 Dates: 2018
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.3847/2041-8213/aae25a
 Degree: -



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Title: Astrophysical Journal, Letters
  Other : ApJL
Source Genre: Journal
Publ. Info: Chicago, IL : University of Chicago Press for the American Astronomical Society
Pages: - Volume / Issue: 866 (1) Sequence Number: L15 Start / End Page: - Identifier: ISSN: 0004-637X
CoNE: https://pure.mpg.de/cone/journals/resource/954922828215_1