English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

In this study we explore the diagnostic potential of the chromospheric Ca IIline at 8542A for studying the magnetic and dynamic properties of solarfilaments. We have acquired high spatial resolution spectropolarimetricobservations in the Ca II 8542A line using the CRISP instrument at the Swedish1-m Solar Telescope. We use the NICOLE inversion code to infer physicalproperties from observations of a solar filament. We discuss the validity ofthe results due to the assumption of hydrostatic equilibrium. We have usedobservations from other telescopes such as CHROTEL and SDO, in order to studylarge scale dynamics and the long term evolution of the filament. We show thatthe Ca II 8542A line encodes information of the temperature, line-of-sightvelocity and magnetic field vector from the region where the filament islocated. The current noise level only allow us to estimate an upper limit of260G for the total magnetic field of the filament. Our study also reveals thatif we only consider information from the aforementioned spectral line, thegeometric height, the temperature and the density can be degenerated parametersoutside the hydrostatic equilibrium approach.

Diagnostic potential of the Ca II 8542A line for solar filaments