Atmospheric and Internal Refraction in Meridian Observations

Details Atmospheric and Internal Refraction in Meridian Observations Atmospheric and Internal Refraction in Meridian Observations

May 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...196..301h&link_type=abstract

Astronomy and Astrophysics, Vol.196, NO. 1/2/MAY, P. 301, 1988

Astronomy and Astrophysics

Astrophysics

7

Scientific paper

Various strong evidence has been obtained for Internal Refraction, INR, in the tube of meridian telescopes, and an efficient technique for eliminating it has been demonstrated. This effect has passed unnoticed until recently although it is usually as large as 1.0 arcsec and quite variable, and it has presumably dominated all measurements of the so-called horizontal flexure. Even up to 3" INR has been observed in a vertical circle. An INR of 1".0 in a horizontal meridian tube must be caused by a vertical temperature gradient about 4 K/m (positive towards zenith), but a satisfactory explanation for this gradient has only partly been found. Through the removal of INR a much better determination of atmospheric refraction becomes possible, since the two effects are inseparably confounded. A difference between the refraction constants in north and south is interpreted as a tilt of the atmospheric layers on La Palma by typically 36".

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