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86 papers
Comparative clustering analysis of Ca II 854.2 nm spectral profiles from simulations and observations
Thore E. Moe, Tiago M. D. Pereira, Luc Rouppe van der Voort +4
We aim to compare and contrast the typical shapes of synthetic Ca II 854.2 nm spectra found in Bifrost simulations having different magnetic activity with the spectral shapes found…
The impact of multi-fluid effects in the solar chromosphere on the ponderomotive force under LTE and NEQ ionization conditions
Juan Martínez-Sykora, Bart De Pontieu, Viggo H. Hansteen +3
The ponderomotive force is suggested to be the main mechanism to produce the so-called first ionization potential (FIP) effect - the enrichment of low FIP elements observed in the…
Numerical simulations and observations of Mg II in the solar chromosphere
Viggo Hansteen, Juan Martinez Sykora, Mats Carlsson +3
The Mg II h&k lines are amongst the best diagnostic tools of the upper solar chromosphere. This region of the atmosphere is of particular interest as it is the lowest region of the…
Chromospheric and Coronal heating in active region plage by dissipation of currents from braiding
Souvik Bose, Bart De Pontieu, Viggo Hansteen +3
It remains unclear which physical processes are responsible for the dramatic increase with height of the temperature in stellar atmospheres, known as the chromospheric (10,00…
Chromospheric Heating from Local Magnetic Growth and Ambipolar Diffusion Under Non-Equilibrium Conditions
Juan Martínez Sykora, Jaime de la Cruz Rodríguez, Milan Gošić +3
The heating of the chromosphere in internetwork regions remains one of the foremost open questions in solar physics. In the present study we tackle this old problem by using a very…
Solar Orbiter and SDO Observations, and Bifrost MHD Simulations of Small-scale Coronal Jets
Navdeep K. Panesar, Viggo H. Hansteen, Sanjiv K. Tiwari +3
We report high-resolution, high-cadence observations of five small-scale coronal jets in an on-disk quiet Sun region observed with Solar Orbiter's EUI/\hri\ in 174 Å. We combine th…