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Quiet Sun Magnetic Fields
  Astronomy and astrophysics

Friday 04 November 2016
from 10:30 to 11:30
at FC61
Speaker : Luis Bellot Rubio (Instituto de Astrofisica de Andalucia)
Abstract : he quiet Sun is the region of the solar surface outside of sunspots and pores. In intensity images it appears dominated by granular convection. However, in polarized light the quiet Sun exhibits impressive magnetic activity on a broad range of scales, from the 30000 km of the photospheric network down to the 100 km of the smallest magnetic features observed in the interior of supergranular cells - the solar internetwork. Internetwork magnetic fields evolve in a coherent way, interacting with each other as they are advected towards the network by the horizontal supergranular flows. They appear continually, bringing enormous amounts of magnetic flux to the solar surface. Part of this flux disappears through cancellation with preexisting fields, which may be an important mechanism for chromospheric heating. Quiet Sun fields are difficult to observe because they produce weak polarization signals, so their evolution and nature remain largely unknown. However, in the last years we have made significant progress thanks to the availability of high spatial resolution, high sensitivity spectropolarimetric measurements from space and from the ground. In this talk I will review our current knowledge of the quiet Sun magnetism, paying special attention to the properties of internetwork fields, their modes of appearance and disappearance, their interactions, the way they couple the various layers of the solar atmosphere, and their origin and nature. The most important open questions will be identified and some ideas on how to answer them will be presented.

AlbaNova  | Last modified 05 December 2017 10:13  |  HELP