Low-lying magnetic loops in the solar internetwork

Free access article

Issue		A&A Volume 469, Number 3, July III 2007


Page(s)		L39 - L42
Section		Letters
DOI		http://dx.doi.org/10.1051/0004-6361:20077505

A&A 469, L39-L42 (2007)
DOI: 10.1051/0004-6361:20077505

Letter

Low-lying magnetic loops in the solar internetwork

M. J. Martínez González^{1, 2}, M. Collados², B. Ruiz Cobo², and S. K. Solanki³

¹ LERMA, Observatoire de Paris-Meudon, 5 place Jules Janssen, 92195 Meudon, France
    e-mail: Marian.Martinez@obspm.fr
² Instituto de Astrofísica de Canarias, vía Láctea S/N, 31200 La Laguna, Spain
    e-mail: mcv@iac.es, brc@iac.es
³ Max-Planck-Institut für Sonnensystemforschung, Max-Planck-Str. 2, 37191 Katlenburg-Lindau, Germany
    e-mail: solanki@mps.mpg.de

(Received 19 March 2007 / Accepted 9 May 2007)

Abstract
Aims.We study the structure of the magnetic field vector in the internetwork and search for the presence of small-scale loops.
Methods.We invert 1.56 $\mu$ m spectropolarimetric observations of internetwork regions at disc centre by applying the SIR code. This allows us to recover the atmospheric parameters that play a role in the formation of these spectral lines. We are mainly interested in the structure of the magnetic field vector.
Results.We find that many opposite polarity elements of the internetwork are connected by short (2-6´´), low-lying (photospheric) loops. These loops connect at least the 10-20% of the internetwork flux visible in our data. Also we have some evidence that points towards a dynamic scenario that can be produced by the emergence of internetwork magnetic flux.

Key words: magnetic fields -- Sun: atmosphere

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