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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…
: A comprehensive database of stratified thermodynamic models in the low solar atmosphere
Alberto Sainz Dalda, Aaryan Agrawal, Bart De Pontieu +1
Our knowledge of the low solar atmosphere, i.e., the photosphere and chromosphere, is based on the knowledge gained from the observations and the theoretical and numerical modeling…
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…
Coronal Abundances in an Active Region: Evolution and Underlying Chromospheric and Transition Region Properties
Paola Testa, Juan Martinez-Sykora, Bart De Pontieu
The element abundances in the solar corona and solar wind are often different from those of the solar photosphere, typically with a relative enrichment of elements with low first i…
Multi-Fluid Simulations of Upper Chromospheric Magnetic Reconnection with Helium-Hydrogen mixture
Q. M. Wargnier, J. Martinez-Sykora, V. H. Hansteen +1
Our understanding of magnetic reconnection (MR) under chromospheric conditions remains limited. Recent observations have demonstrated the important role of ion-neutral interactions…