492 citations
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33 papers · 1 filter
Stochastic entropy production in the quiet Sun magnetic fields
Andrei Gorobets, Svetlana Berdyugina
The second law of thermodynamics imposes an increase of macroscopic entropy with time in an isolated system. Microscopically, however, the entropy production can be negative for a…
Joint X-ray, EUV and UV Observations of a Small Microflare
Iain G. Hannah, Lucia Kleint, Säm Krucker +5
We present the first joint observation of a small microflare in X-rays with the Nuclear Spectroscopic Telescope ARray (NuSTAR), UV with the Interface Region Imaging Spectrograph (I…
Convective blueshifts in the solar atmosphere II. High-accuracy observations of the Fe i 6173.3Å line and deviations of full-disk Dopplergrams
Franziska Stief, Johannes Löhner-Böttcher, Wolfgang Schmidt +2
Granular convective motions reach into the lower solar atmosphere, typically causing photospheric spectral lines to exhibit a differential line shift. This Doppler shift to shorter…
Heating of the solar photosphere during a white-light flare
Jan Jurcak, Jana Kasparova, Michal Svanda +1
The \ion{Fe}{i} lines observed by the Hinode/SOT spectropolarimeter were always seen in absorption, apart from the extreme solar limb. Here we analyse a unique dataset capturing th…
Magnetic properties of a long-lived sunspot - Vertical magnetic field at the umbral boundary
Markus Schmassmann, Rolf Schlichenmaier, Nazaret Bello González
Context. In a recent statistical study of sunspots in 79 active regions, the vertical magnetic field component averaged along the umbral boundary is found to be inde…
Analysis methods of the flow field around decaying sunspots
Hanna Strecker, Nazaret Bello González
The moat flow, a radial outflow surrounding fully fledged sunspots, is a well characterised phenomenon. Nevertheless, its origin and especially its relation to the penumbra is stil…