Bibcode
Cabrera Solana, D.; Bellot Rubio, L. R.; Beck, C.; Del Toro Iniesta, J. C.
Bibliographical reference
Solar Polarization 4, ASP Conference Series, Vol. 358, Proceedings of the conference held 19-23 September, 2005, in Boulder, Colorado, USA. Edited by R. Casini and B. W. Lites, p.25
Advertised on:
12
2006
Citations
4
Refereed citations
2
Description
We present an analysis of simultaneous observations of a sunspot in two
different spectral ranges (630 nm and 1565 nm). The dataset was acquired
with the POlarimetric LIttrow Spectrograph (POLIS) and the Tenerife
Infrared Polarimeter (TIP) at the German Vacuum Tower Telescope (VTT) of
Observatorio del Teide. Inversions of both sets of lines are carried out
to retrieve physical quantities such as temperature and magnetic fields.
We find that: a) the differences between the atmospheric parameters
inferred from the two ranges are small, demonstrating that inversion
techniques provide unique results; b) there is a cross-talk between
temperature and stray light for visible lines; c) a more realistic
treatment of the stray light contamination is required. Making use of
both visible and infrared lines we obtain < dB/dz
>=-2.3±0.6 G km-1 and < dγ/dz
>=-0.019±0.015 deg km-1 in the umbra. Finally, we
show how simultaneous spectro-polarimetric observations of the Sun in
visible and infrared wavelengths improve the diagnostic capabilities of
a single spectral range alone.