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Astron. Astrophys. 340, 569-578 (1998)

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TESOS, a double Fabry-Perot instrument for solar spectroscopy

T.J. Kentischer, W. Schmidt, M. Sigwarth and M.v. Uexküll

Kiepenheuer Institut für Sonnenphysik, Schöneckstrasse 6, D-79104 Freiburg, Germany (e-mail: tk; wolfgang; msig; uex@kis.uni-freiburg.de)

Received 27 March 1998 / Accepted 31 July 1998


A double Fabry-Perot spectrometer in a telecentric configuration (TESOS: Telecentric Etalon SOlar Spectrometer) has been developed and installed in the Vacuum Tower Telescope at the Observatorio del Teide, Tenerife. The control system allows to switch from one wavelength band to another within 2 seconds. The telecentric configuration provides a constant wavelength passband across the field of view. Servo-stabilized etalons and a stable thermal environment provide a wavelength stability of [FORMULA]0.3 picometer per hour. We present initial results obtained with this instrument.

Key words: Sun: particle emission – Sun: magnetic fields – instrumentation: spectrographs – instrumentation: interferometers

© European Southern Observatory (ESO) 1998

Online publication: November 9, 1998