Volume 527, March 2011
|Number of page(s)||4|
|Published online||08 February 2011|
Letters to the Editor
Are solar chromospheric fibrils tracing the magnetic field?
Institute for Solar Physics, Royal Swedish Academy of Sciences, AlbaNova
2 Department of Astronomy, Stockholm University, AlbaNova University Center, 106 91 Stockholm, Sweden
3 Instituto de Astrofísica de Canarias, Avda Vía Láctea S/N, La Laguna 38200, Tenerife, Spain
4 Departamento de Astrofísica, Universidad de La Laguna, 38205 La Laguna, Tenerife, Spain
Received: 29 October 2010
Accepted: 17 January 2011
Fibrils are thin elongated features visible in the solar chromosphere in and around magnetized regions. Because of their visual appearance, they have been traditionally considered a tracer of the magnetic field lines. For the first time, we challenge that notion by comparing their orientation to that of the magnetic field, obtained via high-resolution spectropolarimetric observations of Ca ii lines. The short answer to the question posed in the title is that mostly yes, but not always.
Key words: Sun: activity / polarization / Sun: chromosphere / Sun: filaments, prominences / Sun: magnetic topology / sunspots
© ESO, 2011
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