Search Results - "Borgnino, J."

On the isoplanatic patch size in high-angular resolution techniques by Ziad, A, Aristidi, E, Chabé, J, Borgnino, J

“…ABSTRACT To reach a high performance with an adaptive optics system, we need a calibration using a reference source. This latter should be located in the same…”
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First statistics of the isopistonic angle for long baseline interferometry by Ziad, A., Elhalkouj, T., Petrov, R. G., Borgnino, J., Lazrek, M., Benkhaldoun, Z., Martin, F., Elazhari, Y.

“…To reach a suitable limiting magnitude with a multi-aperture interferometer, we need to cophase the different telescopes using a reference source. The latter…”
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Measurements of profiles of the wavefront outer scale using observations of the limb of the Moon by Maire, J., Ziad, A., Borgnino, J., Martin, F.

“…The wavefront outer scale is an important parameter to use when evaluating the experimental performance of large aperture telescopes. Knowledge of…”
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MISOLFA: a generalized monitor for daytime spatio-temporal turbulence characterization by Ikhlef, R., Corbard, T., Morand, F., Renaud, C., Fodil, M., Ziad, A., Borgnino, J., Meftah, M., Assus, P., Chauvineau, B., Hauchecorne, A., Lesueur, P., Poiet, G., Ubaldi, F., Hamadouche, M., Abdelatif, T.

“…Ground-based solar observations are strongly affected by optical turbulence. The concept of a new instrument which allows one to measure both spatial and…”
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Modelling the optical turbulence boiling and its effect on finite-exposure differential image motion by Berdja, A., Borgnino, J.

“…It is usually accepted that whenever dealing with astronomical observation through the atmosphere, the optical turbulence temporal evolution can be…”
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Comparison between atmospheric turbulence models by angle-of-arrival covariance measurements by Maire, J., Ziad, A., Borgnino, J., Martin, F.

“…Context. In the context of astronomical observations, large-scale wavefront modelling is crucial to define specifications and to evaluate expected performances…”
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A site-testing campaign at the Calar Alto Observatory with GSM and DIMM instruments by Ziad, A., Gredel, R., Aceituno, J., Borgnino, J., Hoyo, F., Irbah, A., Martin, F., Thiele, U., Pedraz, S.

“…The main atmospheric optical parameters have been measured at the Calar Alto Observatory simultaneously using the Generalized Seeing Monitor (GSM) and a…”
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High-resolution altitude profiles of the atmospheric turbulence with PML at the Sutherland Observatory by Catala, L., Ziad, A., Fanteï-Caujolle, Y., Crawford, S. M., Buckley, D. A. H., Borgnino, J., Blary, F., Nickola, M., Pickering, T.

“…Abstract With the prospect of the next generation of ground-based telescopes, the extremely large telescopes, increasingly complex and demanding adaptive…”
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Solar diameter measurements with Calern observatory astrolabe and atmospheric turbulence effects by IRBAH, A, LACLARE, F, BORGNINO, J, MERLIN, G

“…In order to deduce significant astrophysical results from solar diameter measurements it is necessary to taken an accurate account of instrumental and…”
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Modelling the optical turbulence boiling and its effect on finite-exposure differential image motion by Berdja, A., Borgnino, J.

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Feature extraction from solar images using wavelet transform: image cleaning for applications to solar astrolabe experiment by Irbah, A, Bouzaria, M, Lakhal, L, Moussaoui, R, Borgnino, J, Laclare, F, Delmas, C

“…Good edge extraction from temporal series of solar images is fundamental in the solar astrolabe experiment. Noise and spots in images cause however,…”
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Analysis of Diameter Measurements Performed at Calern Observatory Astrolabe by Moussaoui, R, Irbah, A, Abdelatif, T, Fossat, E, Borgnino, J, Laclare, F, Delmas, C

“…Solar diameter measurements performed at Calern Observatory astrolabe during more than two solar cycles show variations at various time scales in a broad…”
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Comparison between atmospheric turbulence models by angle-of-arrival covariance measurements by Maire, J., Ziad, A., Borgnino, J., Martin, F.

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Measurements of profiles of the wavefront outer scale using observations of the limb of the Moon by Maire, J., Ziad, A., Borgnino, J., Martin, F.

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A study of the degradation of daytime astronomical images due to turbulence in the lower atmosphere by measurement of the standard deviation of the angle of arrival by Borgnino, J., Vernin, J., Aime, C., Ricort, G.

“…Fluctuations in the angle-of-arrival of a luminous wavefront are investigated by placing a narrow slit over the image of the solar limb and observing the…”
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A site-testing campaign at the Calar Alto Observatory with GSM and DIMM instruments by Ziad, A., Gredel, R., Aceituno, J., Borgnino, J., Hoyo, F., Irbah, A., Martin, F., Thiele, U., Pedraz, S.

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High-Resolution Altitude Profiles of the Atmospheric Turbulence with PML at the Sutherland Observatory by Catala, L, Ziad, A, Fantei-Caujolle, Y, Crawford, S. M, Buckley, D. A. H, Borgnino, J, Blary, F, Nickola, M, Pickering, T

“…With the prospect of the next generation of ground-based telescopes, the extremely large telescopes (ELTs), increasingly complex and demanding adaptive optics…”
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Optimized spectral bandwidth in high angular resolution imaging effect of a finite spatial-coherence outer scale by ZIAD, A., BORGNINO, J., AGABI, A., MARTIN, F.

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A comparison between estimations of Fried's parameter r o simultaneously obtained by measurements of solar granulation contrast and of the variance of angle-of-arrival fluctuations by Ricort, G., Borgnino, J., Aime, C.

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Determination of Fried's parameter r 0 prediction for the observed r.m.s. contrast in solar granulation by Ricort, G., Aime, C., Roddier, C., Borgnino, J.

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