Physics – Optics
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sp21b03h&link_type=abstract
American Geophysical Union, Spring Meeting 2001, abstract #SP21B-03
Physics
Optics
7594 Instruments And Techniques
Scientific paper
The Advanced Technology Solar Telescope (ATST) site survey will be carried out with a Solar Differential Image Motion Monitor (S-DIMM) and a six-scintillometer SHAdow BAnd Ranging (SHABAR) array. This device will provide estimates of the Fried parameter, R0, derived from the differential motion measurements of two images of the same cut across the solar limb formed by two 45 mm diameter telescope apertures 225 mm apart, and an estimate of the height dependence of the index of refraction structure parameter, Cn2, from the co-variance of the signals from an array of 6 scintillometers with 15 baseline separations. It will also provide a cloud cover measurement and RMS scintillation signal. In preparation for the survey, we compare estimates of daytime solar seeing obtained simultaneously from seven different instruments. The observations were made at NSO/Sacramento Peak during the period January 26 - February 5, 2001 under a variety of seeing and transparency conditions ranging from poor to excellent. The seven instruments were: 1. a S-DIMM/SHABAR mounted at the top of the Dunn Solar Tower (DST) 2. an identical S-DIMM/SHABAR mounted at ground level 3. the NSO/SP Adaptive Optics wavefront sensor providing subaperature image motion measurements 4. a Dalsa camera providing bursts of high-speed images for spectral ratio seeing estimates 5. a Xedar camera obtaining granulation images for contrast and differential stretching measurements 6. a Seykora scintillometer mounted in the DST 7. a video camera recording a movie of the visual quality of the image The analysis of this data set will provide the first direct comparison of this many simultaneous solar seeing measurements, test the ATST site survey system, and verify the SHABAR measurement of the seeing height profile.
Balasubramaniam K. S.
Beckers Jacques M.
Briggs John W.
Denker Carsten
Hegwer Stephen
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