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Solar Physics

, Volume 182, Issue 1, pp 247–255 | Cite as

Automatic guiding of the primary image of solar Gregory telescopes

  • G. Küveler
  • E. Wiehr
  • D. Thomas
  • M. Harzer
  • M. Bianda
  • A. Epple
  • P. Sütterlin
  • E. Weisshaar
Article

Abstract

The primary image reflected from the field stop of solar Gregory telescopes is used for automatic guiding. This new system avoids temporal varying influences from the bending of the telescope tube by the main mirror's gravity and from offsets between the telescope and a separate guiding refractor. The required stiffness of the guider mechanics and the small areas of the sensors demand small f numbers for the guider optics, which cause problems with the image quality and with heat. Problems also arise from the pinhole in the telescope's field stop which is imaged as a dark dot on the sensor. Pointing errors introduced by the telescope affect shifts of the solar image on the sensor. These are numerically determined by Fourier methods which are found to be less sensitive to noise than profile centering methods. Several types of guiders are tested, the final equipment, now installed at the Gregory telescopes at Tenerife and at Locarno, is described.

Keywords

Fourier Image Quality Small Area Fourier Method Primary Image 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Kluwer Academic Publishers 1998

Authors and Affiliations

  • G. Küveler
    • 1
  • E. Wiehr
    • 2
  • D. Thomas
    • 1
  • M. Harzer
    • 1
  • M. Bianda
    • 3
  • A. Epple
    • 4
  • P. Sütterlin
    • 2
  • E. Weisshaar
    • 5
  1. 1.Fachhochschule WiesbadenRüsselsheimGermany
  2. 2.Universitäts-SternwarteGöttingenGermany
  3. 3.Istituto Ricerche Solari LocarnoLocarno-MontiSwitzerland
  4. 4.Max-Planck-Institut für AeronomieKatlenburg-LindauGermany
  5. 5.Numatec G.m.b.H.HeidesheimGermany

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