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An observationally-constrained model of strong magnetic reconnection in the solar chromosphere. Atmospheric stratification and estimates of heating rates
C. J. Díaz Baso, J. de la Cruz Rodríguez, J. Leenaarts
The evolution of the photospheric magnetic field plays a key role in the energy transport into the chromosphere and the corona. In active regions, newly emerging magnetic flux inte…
Line formation of He I D3 and He I 10830 Å in a small-scale reconnection event
T. Libbrecht, J. P. Bjørgen, J. Leenaarts +3
Aims. We aim to explain line formation of He I D3 and He I 10830 Å in small-scale reconnection events. Methods. We make use of a simulated Ellerman bomb (EB), present in a Bifrost-…
Non-LTE inversions of a confined X2.2 flare: I. Vector magnetic field in the photosphere and chromosphere
G. J. M. Vissers, S. Danilovic, J. de la Cruz Rodriguez +7
Obtaining the magnetic field vector accurately in the solar atmosphere is essential for studying changes in field topology during flares and to reliably model space weather. We tac…
New light on an old problem of the cores of solar resonance lines
Philip Judge, Lucia Kleint, Jorrit Leenaarts +2
We re-examine a 50+ year-old problem of deep central reversals predicted for strong solar spectral lines, in contrast to the smaller reversals seen in observations. We examine data…
ALMA observations of transient heating in a solar active region
J. M. da Silva Santos, J. de la Cruz Rodríguez, S. M. White +3
We aim to investigate the temperature enhancements and formation heights of impulsive heating phenomena in solar active-regions such as Ellerman bombs (EBs), ultraviolet bursts (UV…
Physical properties of bright Ca II K fibrils in the solar chromosphere
Sepideh Kianfar, Jorrit Leenaarts, Sanja Danilovic +2
Broad-band images of the solar chromosphere in the Ca II H&K line cores around active regions are covered with fine bright elongated structures called bright fibrils. The mechanism…