Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...225..585h&link_type=abstract
Astronomy and Astrophysics, Vol. 225, NO. 2/NOV, P. 585, 1989
Astronomy and Astrophysics
Astrophysics
4
Scientific paper
In order to test the capability of a sodar to measure the atmospheric seeing quality, a monostatic sodar was operated at the Pic-du-Midi Observatory during the 1984 summer months, simultaneously, with real time observations by an optical seeing-monitor. During the same period, radiosonde data from Duhort-Bachen, a station approximately 100 kms N from the Pic-du-Midi, allowed seeing conditions calculations through a C2n computations model (CN 2). The results have shown the influence of wind speed and shear parameters on seeing quality. Good meteorological conditions, involving wind speed and wind shear, have given close agreement between the three sets of data. But during the days characterized by altitude turbulence better results have been obtained from CN 2 values, the sodar systematically undervaluing the spread-angle. During several days, the discrepancy with the C2n calculations has been ascribed to a local jet supposed no more present over Pic-du-Midi. These preliminary results suggest that both systematic observations of wind parameters in the first kilometer and in higher altitude layers (up to 15 km), are necessary for efficient forecast of the image quality.
Hecquet Josette
Klaus V.
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