Issue |
A&A
Volume 436, Number 1, June II 2005
|
|
---|---|---|
Page(s) | 325 - 331 | |
Section | The Sun | |
DOI | https://doi.org/10.1051/0004-6361:20042214 | |
Published online | 20 May 2005 |
Inference of the magnetic field in spicules
from spectropolarimetry of He I D
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
We present observations of spicules in the 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
in some cases (for heights between 3000 and
above the
photosphere).
Key words: Sun: chromosphere / Sun: magnetic fields
© ESO, 2005
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