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On the origin of the Type~{\sc ii} spicules - dynamic 3D MHD simulations
Juan Martínez-Sykora, Viggo Hansteen, Fernando Moreno-Insertis
have forced the definition of a new type of spicule, "type II's", that are characterized by rising rapidly, having short lives, and by fading away at the end of their lifetimes. He…
Radiative transfer with scattering for domain-decomposed 3D MHD simulations of cool stellar atmospheres
W. Hayek, M. Asplund, M. Carlsson +5
We present the implementation of a radiative transfer solver with coherent scattering in the new BIFROST code for radiative magneto-hydrodynamical (MHD) simulations of stellar surf…
Modelling of EIS spectrum drift from instrumental temperatures
S. Kamio, H. Hara, T. Watanabe +2
An empirical model has been developed to reproduce the drift of the spectrum recorded by EIS on board Hinode using instrumental temperatures and relative motion of the spacecraft.…
On red shifs in the transition region and corona
Viggo H. Hansteen, Hirohisa Hara, Bart de Pontieu +1
We present evidence that transition region red-shifts are naturally produced in episodically heated models where the average volumetric heating scale height lies between that of th…
Chromospheric heating and structure as determined from high resolution 3D simulations
Mats Carlsson, Viggo H. Hansteen, Boris V. Gudiksen
We have performed 3D radiation MHD simulations extending from the convection zone to the corona covering a box 16 Mm at 32 km spatial resolution. The simulations show very fine…