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Issue A&A
Volume 436, Number 1, June II 2005
Page(s) 325 - 331
Section The Sun
DOI http://dx.doi.org/10.1051/0004-6361:20042214



A&A 436, 325-331 (2005)
DOI: 10.1051/0004-6361:20042214

Inference of the magnetic field in spicules from spectropolarimetry of He I D $_\mathsf{3}$

A. López Ariste1 and R. Casini2

1  THEMIS. C/ Vía Láctea s/n, 38200 La Laguna, Tenerife, Spain
    e-mail: arturo@themis.iac.es
2  High Altitude Observatory, National Center for Atmospheric Research, PO Box 3000, Boulder, CO 80307-3000, USA

(Received 20 October 2004 / Accepted 28 January 2005)

Abstract
We present observations of spicules in the $\ion{He}{i}$ D3 line with full-Stokes spectropolarimetry, which were done with the Advanced Stokes Polarimeter at the Dunn Solar Telescope of the Sacramento Peak Observatory. The line profiles appear to be significantly broadened by non-thermal processes, which we interpret using the hypothesis of a distribution of velocities inside the spicule. The possibility of inferring the magnetic field in those conditions is tested on synthetic data, and the results are generalized to the interpretation of the observed data. We conclude that the magnetic field is aligned with the visible structure of the spicule, with strengths above $30\,\rm G$ in some cases (for heights between 3000 and $5000\,\rm km$ above the photosphere).


Key words: Sun: chromosphere -- Sun: magnetic fields




© ESO 2005


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