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Abstract Review
Corresponding Author |
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Authors |
Name | | Affiliation |
Julian Christou |
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Center for Adaptive Optics, University of California, Santa Cruz, CA 95064, USA |
Lewis Roberts |
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The Boeing Company, Kihei, HI 96753, USA |
Lawrence Bradford |
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The Boeing Company, Kihei, HI 96753, USA |
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Abstract |
Session | | 2 (Adaptive optics, interferometry, and other approaches to mitigate atmospheric optical turbulence.) |
Title | | 'Instantaneous Seeing estimates using closed-loop AO images' |
Abstract | | The temporal variability of atmospheric seeing at short time scales has been investigated by using closed-loop adaptive optics (AO) imaging from two different AO systems at the 3m Shane Telescope at Lick Observatory (LO) and at the 3.6m AEOS at Haleakala. The "instantaneous" Strehl ratios were obtained directly from the short-exposure data for the LO observations and from Fourier propagating the measured residual wavefront slopes for the AEOS data. For both sets of data under quasi-stationary conditions, the distribution of the Strehl ratio shows a negative skewness. We have related that effect to the log-normal distribution of the "instantaneous" Fried parameter, r0, and the gamma distribution of the phase variance. These data indicate temporal variation in the instantaneous r0 at different time scales.
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