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Diagnostic potential of the Ca II 8542 Ångstrom line for solar filaments
Stockholm University, Faculty of Science, Department of Astronomy. Instituto de Astrofísica de Canarias, Spain; Universidad de La Laguna, Spain.
Stockholm University, Faculty of Science, Department of Astronomy.
Number of Authors: 42019 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 623, article id A178Article in journal (Refereed) Published
Abstract [en]

Aims. In this study we explore the diagnostic potential of the chromospheric Ca II line at 8542 angstrom for studying the magnetic and dynamic properties of solar filaments. We have acquired high spatial resolution spectropolarimetric observations in the Ca II 8542 angstrom line using the CRISP instrument at the Swedish 1 m Solar Telescope. Methods. We used the NICOLE inversion code to infer physical properties from observations of a solar filament. We discuss the validity of the results due to the assumption of hydrostatic equilibrium. We have used observations from other telescopes such as CHROTEL and SDO, in order to study large scale dynamics and the long term evolution of the filament. Results. We show that the Ca II 8542 angstrom line encodes information of the temperature, line-of-sight velocity and magnetic field vector from the region where the filament is located. The current noise levels only allow us to estimate an upper limit of 260 G for the total magnetic field of the filament. Our study also reveals that if we consider information from the aforementioned spectral line alone, the geometric height, the temperature and the density could be degenerated parameters outside the hydrostatic equilibrium approach.

Place, publisher, year, edition, pages
2019. Vol. 623, article id A178
Keywords [en]
Sun: filaments, prominences, Sun: chromosphere, Sun: magnetic fields, Sun: oscillations, Sun: evolution
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:su:diva-168607DOI: 10.1051/0004-6361/201834793ISI: 000462696900001OAI: oai:DiVA.org:su-168607DiVA, id: diva2:1315262
Available from: 2019-05-13 Created: 2019-05-13 Last updated: 2019-05-13Bibliographically approved

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