EDP Sciences Journals List
Advanced Search
Subscriber Authentication Point
Home All issues Volume 451/3 Article
Free access article

Issue A&A
Volume 451, Number 3, June I 2006
Page(s) 1151 - 1158
Section Instruments, observational techniques, and data processing
DOI http://dx.doi.org/10.1051/0004-6361:20054487



A&A 451, 1151-1158 (2006)
DOI: 10.1051/0004-6361:20054487

The new Göttingen Fabry-Pérot spectrometer for two-dimensional observations of the Sun

K. G. Puschmann1, F. Kneer1, T. Seelemann1, 2 and A. D. Wittmann1

1  Institut für Astrophysik, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany
    e-mail: kgp@astro.physik.uni-goettingen.de
2  LaVision GmbH, Anna-Vandenhoeck-Ring 19, 37081 Göttingen, Germany

(Received 7 November 2005 / Accepted 10 March 2006 )

Abstract
Studies of small-scale dynamics and magnetic fields in the solar atmosphere require spectroscopy and polarimetry with high spatial resolution. For this purpose, spectrometers based on Fabry-Pérot interferometers (FPIs) have advantages over slit spectrographs. They possess a high throughput and allow fast two-dimensional, narrow-band imaging and image reconstruction of the data. In the present contribution we describe an upgrade, essentially renewal, of the Göttingen FPI spectrometer achieved during the first half of 2005. A new etalon from IC Optical Systems Ltd. (formerly Queensgate), England, with 70 mm free aperture for high spectral resolution has been mounted. New CCD detectors from LaVision GmbH (Göttingen) with powerful computer hard- and software were implemented. We consider the product of signal-to-noise ratio, frame rate, and field of view as a measure of the efficiency. At low light levels, e.g. in narrow-band speckle applications, this product has increased by a factor ~60 compared to the old system. In addition, several spectral regions can now be scanned quasi-simultaneously. We present first results obtained with the upgraded spectrometer. The efforts are undertaken to provide an up-to-date post-focus instrument for the new German 1.5 m GREGOR solar telescope presently under construction at the Observatorio del Teide on Tenerife.


Key words: instrumentation: high angular resolution -- techniques: high angular resolution -- techniques: image processing -- techniques: spectroscopic




© ESO 2006


What is OpenURL?

The OpenURL standard is a protocol for transmission of metadata describing the resource that you wish to access. An OpenURL link contains article metadata and directs it to the OpenURL server of your choice. The OpenURL server can provide access to the resource and also offer complementary services (specific search engine, export of references...). The OpenURL link can be generated by different means.
  • If your librarian has set up your subscription with an OpenURL resolver, OpenURL links appear automatically on the abstract pages.
  • You can define your own OpenURL resolver with your EDPS Account. In this case your choice will be given priority over that of your library.
  • You can use an add-on for your browser (Firefox or I.E.) to display OpenURL links on a page (see http://www.openly.com/openurlref/). You should disable this module if you wish to use the OpenURL server that you or your library have defined.