Bibcode
Requerey, I. S.; Del Toro Iniesta, Jose Carlos; Bellot Rubio, Luis R.; Martínez Pillet, V.; Solanki, Sami K.; Schmidt, Wolfgang
Bibliographical reference
The Astrophysical Journal, Volume 810, Issue 1, article id. 79, 11 pp. (2015).
Advertised on:
9
2015
Journal
Citations
21
Refereed citations
18
Description
We report on the dynamical interaction of quiet-Sun magnetic fields and
granular convection in the solar photosphere as seen by Sunrise. We use
high spatial resolution (0.″15–0.″18) and temporal
cadence (33 s) spectropolarimetric Imaging Magnetograph eXperiment data,
together with simultaneous CN and Ca ii H filtergrams from Sunrise
Filter Imager. We apply the SIR inversion code to the polarimetric data
in order to infer the line of sight velocity and vector magnetic field
in the photosphere. The analysis reveals bundles of individual flux
tubes evolving as a single entity during the entire 23 minute data set.
The group shares a common canopy in the upper photospheric layers, while
the individual tubes continually intensify, fragment and merge in the
same way that chains of bright points in photometric observations have
been reported to do. The evolution of the tube cores are driven by the
local granular convection flows. They intensify when they are
“compressed” by surrounding granules and split when they are
“squeezed” between two moving granules. The resulting
fragments are usually later regrouped in intergranular lanes by the
granular flows. The continual intensification, fragmentation and
coalescence of flux results in magnetic field oscillations of the global
entity. From the observations we conclude that the magnetic field
oscillations first reported by Martínez González et al.
correspond to the forcing by granular motions and not to characteristic
oscillatory modes of thin flux tubes.