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Proceedings Paper

Tunable H-alpha Lyot filter with advanced servo system and image processing: instrument design and new scientific results with the Dutch Open Telescope
Author(s): Felix C. M. Bettonvil; Robert H. Hammerschlag; Peter Sütterlin; Robert J. Rutten; Aswin P. L. Jägers; Guus Sliepen
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Paper Abstract

The Dutch Open Telescope (DOT; http://dot.astro.uu.nl) on La Palma is a revolutionary open solar telescope, on an excellent site, on top of a transparent tower of steel framework, and uses natural air flow to minimize local seeing. The DOT is a high-resolution multi-wavelength imager capable of long-duration time series aiming at magnetic fine structure, topology and dynamics in the photosphere and low- and high chromosphere. In this paper we describe the latest addition to the multi-wavelength imaging system: a Lyot H-alpha camera channel operating at a wavelength of 656.3 nm, being of major interest for high-chromospheric phenomena. The channel is operated strictly synchronous with the other channels and all data are speckle reconstructed. The channel permits profile sampling and delivers Dopplergrams in a 15 second time cadence, up to several hours long and adding up to a total data amount of 1.6 Terabyte/day. A dedicated computer (DSP, DOT Speckle Processor) has been built for processing the data overnight.

Paper Details

Date Published: 27 June 2006
PDF: 12 pages
Proc. SPIE 6269, Ground-based and Airborne Instrumentation for Astronomy, 62690E (27 June 2006); doi: 10.1117/12.670754
Show Author Affiliations
Felix C. M. Bettonvil, Astronomical Institute, Utrecht Univ. (Netherlands)
Netherlands Foundation for Research in Astronomy ASTRON (Netherlands)
Robert H. Hammerschlag, Astronomical Institute, Utrecht Univ. (Netherlands)
Peter Sütterlin, Astronomical Institute, Utrecht Univ. (Netherlands)
Netherlands Foundation for Research in Astronomy ASTRON (Netherlands)
Robert J. Rutten, Astronomical Institute, Utrecht Univ. (Netherlands)
Aswin P. L. Jägers, Utrecht Univ. (Netherlands)
Guus Sliepen, Astronomical Institute, Utrecht Univ. (Netherlands)


Published in SPIE Proceedings Vol. 6269:
Ground-based and Airborne Instrumentation for Astronomy
Ian S. McLean; Masanori Iye, Editor(s)

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