Vibration of Star Images in Telescopes as a Function of Zenith Distance

  • I. G. Kolchinskii


Determination of the dependence of star-image vibration upon zenith distance (z) is of interest for the following reasons:
  1. 1.

    From theory it follows that star-image vibrations or fluctuations in the arrival angles of light rays must increase in proportion to L0.5, where L is the length of the path traversed by the ray in the atmosphere (L≈L0 sec z, where L0is the path length at z = 0°) [1, 2]. It is important to establish how accurately this relationship works under real conditions.

  2. 2.

    Observations of star-image vibrations at different zenith distances are essential in astroclimatology. In this case, curves showing vibration as a function of z differ, generally speaking, at different locations and on different nights. An explanation of the causes of this difference would be valuable for a study of the effect of locality and weather conditions on astroclimates.

  3. 3.

    The propagation conditions in the atmosphere for various kinds of radiation generated by terrestrial sources, particularly lasers,has gained more and more importance in recent years. It is well known that fluctuations of the optical parameters of the atmosphere destroy such a valuable property of laser beams as coherence. Study of the effect of these fluctuations for different values of z, therefore, is of immediate practical importance [3].



Phase Fluctuation Photographic Observation Arrival Angle Zenith Distance Star Image 
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Copyright information

© Consultants Bureau, New York 1970

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  • I. G. Kolchinskii

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