Solar adaptive optics: a progress report

Rimmelé, Thomas; Richards, Kit; Hegwer, S.; Ren, Deqing; Fletcher, Stephen; Gregory, Scott; Didkovsky, L. V.; Denker, C.; Marquette, W.; Mariño, José María Solé; Goode, Philip R.

doi:10.1117/12.457018

Cited by 27 publications

(9 citation statements)

References 6 publications

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“…They also have minimal constraints on data bandwidth and can flexibly study a variety of spectral features. Future instrumentation is emphasizing larger apertures, higher frame rates (Jess et al 2007), and the implementation of high-order adaptive optics (e.g., Rimmele et al 2003;Denker et al 2007). Major new facilities under study include the Advanced Technology Solar Telescope (ATST) and the European Solar Telescope (EST).…”

Section: Opticalmentioning

confidence: 99%

An Observational Overview of Solar Flares

et al. 2011

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We present an overview of solar flares and associated phenomena, drawing upon a wide range of observational data primarily from the RHESSI era. Following an introductory discussion and overview of the status of observational capabilities, the article is split into topical sections which deal with different areas of flare phenomena (footpoints and ribbons, coronal sources, relationship to coronal mass ejections) and their interconnections. We also discuss flare soft X-ray spectroscopy and the energetics of the process. The emphasis is to describe the observations from multiple points of view, while bearing in mind the models that link them to each other and to theory. The present theoretical and observational understanding of solar flares is far from complete, so we conclude with a brief discussion of models, and a list of missing but important observations.

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Section: Opticalmentioning

confidence: 99%

An Observational Overview of Solar Flares

et al. 2011

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“…Solar AO systems have already demonstrated excellent results by using a correlation track algorithm to estimate the differential image motion of a small patch of solar granulation as observed through a Shack-Hartmann subaperture. 22 The same approach could be used with elongated sodium laser guidestars, since these images will contain some high spatial frequency content.…”

Section: Guidestar Elongation and Lgs Signal Requirementsmentioning

confidence: 97%

Wavefront reconstruction algorithms and simulation results for multiconjugate adaptive optics on giant telescopes

Ellerbroek¹

2004

SPIE Proceedings

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The very high-order multi-conjugate adaptive optics (MCAO) systems proposed for future giant telescopes will require new, computationally efficient, concepts for wavefront reconstruction. Advanced methods from computational linear algebra have recently been applied to this problem, and explicit simulations of MCAO wavefront reconstruction problems for 30-meter class telescopes are now possible using desktop personal computers. In this paper, we present sample simulation results obtained using these techniques to illustrate the trends in MCAO performance as the telescope aperture diameter increases from 8 to 32 meters. We consider systems based upon natural guidestars, sodium laser guidestars, and Rayleigh laser guidestars. The performance achieved by the first two classes of guidestars is similar, and the variation in their performance with respect to telescope size is very gradual over this range of aperture diameters. Next, we describe work in progress to adapt the minimum variance reconstruction algorithm, which is optimized for open-loop wavefront estimation, to the more realistic and meaningful case of closed-loop wavefront control. Finally, we summarize the current status of efforts to quantify the impact of sodium laser guide star (LGS) elongation on guidestar signal requirements for LGS AU systems on 30 meter class telescopes.

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“…The lenslet array and camera are directly integrated as a unit via the camera's C-mount screw. Details of the optical design of the solar Shack-Hartmann WFS were also discussed in our previous publication (Ren, Hegwer, Rimmele et al 2003). For clear demonstration, the rays in the optical layout of Figure 3 are all shown in the page plane.…”

Section: Optical Systemmentioning

confidence: 98%

A portable solar adaptive optics system

et al. 2009

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We are developing a portable adaptive optics system for solar telescopes. The adaptive optics has a small physical size and is optimized for diffraction-limited imaging in the 1.0 ~ 5.0-μm infrared wavelength range for 1.5-m class solar telescopes. By replacing a few optical components, it can be used with a solar telescope of any aperture size that is currently available. The software is developed by LabVIEW. LabVIEW's block diagram based programming makes it suitable for rapid development of a prototype system. The portable adaptive optics will be used with a 1.5-meter solar telescope for high-resolution magnetic field investigation in the infrared. We discuss the design philosophy for such a portable, low-cost, and high-performance system. Estimated performances are also presented.

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Solar adaptive optics: a progress report

Cited by 27 publications

References 6 publications

An Observational Overview of Solar Flares

An Observational Overview of Solar Flares

Wavefront reconstruction algorithms and simulation results for multiconjugate adaptive optics on giant telescopes

A portable solar adaptive optics system

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