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Deep probing of the photospheric sunspot penumbra: no evidence of field-free gaps
Borrero, J. M.,Asensio Ramos, A.,Collados, M.,Schlichenmaier, R.,Balthasar, H.,Franz, M.,Rezaei, R.,Kiess, C.,Orozco Suá,rez, D.,Pastor, A.,Berkefeld, T.,von der Lü,he, O.,Schmidt, D.,Schmid Springer-Verlag 2016 Astronomy and astrophysics Vol.596 No.-
Three-dimensional structure of a sunspot light bridge
Felipe, T.,Collados, M.,Khomenko, E.,Kuckein, C.,Asensio Ramos, A.,Balthasar, H.,Berkefeld, T.,Denker, C.,Feller, A.,Franz, M.,Hofmann, A.,Joshi, J.,Kiess, C.,Lagg, A.,Nicklas, H.,Orozco Suá,rez EDP Sciences 2016 Astronomy and astrophysics Vol.596 No.-
UNNOTICED MAGNETIC FIELD OSCILLATIONS IN THE VERY QUIET SUN REVEALED BY SUNRISE/IMaX
Martí,nez Gonzá,lez, M. J.,Asensio Ramos, A.,Manso Sainz, R.,Khomenko, E.,Martí,nez Pillet, V.,Solanki, S. K.,Ló,pez Ariste, A.,Schmidt, W.,Barthol, P.,Gandorfer, A. IOP Publishing 2011 ASTROPHYSICAL JOURNAL LETTERS - Vol.730 No.2
<P>We present observational evidence for oscillations of magnetic flux density in the quiet areas of the Sun. The majority of magnetic fields on the solar surface have strengths of the order of or lower than the equipartition field (300-500 G). This results in a myriad of magnetic fields whose evolution is largely determined by the turbulent plasma motions. When granules evolve they squash the magnetic field lines together or pull them apart. Here, we report on the periodic deformation of the shapes of features in circular polarization observed at high resolution with SUNRISE. In particular, we note that the area of patches with a constant magnetic flux oscillates with time, which implies that the apparent magnetic field intensity oscillates in antiphase. The periods associated with this oscillatory pattern are compatible with the granular lifetime and change abruptly, which suggests that these oscillations might not correspond to characteristic oscillatory modes of magnetic structures, but to the forcing by granular motions. In one particular case, we find three patches around the same granule oscillating in phase, which means that the spatial coherence of these oscillations can reach 1600 km. Interestingly, the same kind of oscillatory phenomenon is also found in the upper photosphere.</P>
Inference of magnetic fields in the very quiet Sun
Martí,nez Gonzá,lez, M. J.,Pastor Yabar, A.,Lagg, A.,Asensio Ramos, A.,Collados, M.,Solanki, S. K.,Balthasar, H.,Berkefeld, T.,Denker, C.,Doerr, H. P.,Feller, A.,Franz, M.,Gonzá,lez EDP Sciences 2016 Astronomy and astrophysics Vol.596 No.-