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Lifting the veil on the solar chromosphere
  Astronomy and astrophysics

Friday 14 March 2014
from 10:30 to 11:30
at FA31
Speaker : Tiago Pereira (University of Oslo)
Abstract : Sandwiched between a much denser and a much hotter place, the solar chromosphere has a puzzling existence. This key layer of the Sun is instrumental in the buildup of energy in the outer corona. However, it is still little understood. With only a tiny amount of the solar flux coming from it, chromospheric observations require increasingly narrow wavelength filters in strong spectral lines. The fleeting nature of many of the chromospheric phenomena makes their observation problematic. Inconsistent and conflicting interpretations abound in the literature. This talk will provide a brief overview of such chromospheric observations and describe the current state of affairs. I will focus on our evolving understanding of chromospheric fibrils, which are pervasive structures that permeate the whole chromosphere. According to some, they may heat the corona. According to others, they may cool the corona, or perhaps have no role in the transfer of energy at all. Finally, I will discuss how the new IRIS satellite, 3D MHD models, and new instrumentation at the SST will all come together to help solve these dilemmas.

AlbaNova  | Last modified 05 December 2017 10:07  |  HELP