Progress with solar multi-conjugate adaptive optics at NSO

Rimmelé, Thomas; Richards, Kit; Roche, Jacqueline M.; Hegwer, S.; Tritschler, A.

doi:10.1117/12.671603

Cited by 11 publications

(5 citation statements)

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“…The height distribution of the turbulence profile can be determined via tomographic wave-front sensing. To verify the MCAO concept for solar high-resolution imaging, two prototypes are being developed: one for the 0.7 m Dunn Solar Telescope at the NSO [10], and the other with the VTT and GREGOR [11].…”

Section: Introductionmentioning

confidence: 99%

Solar tomography adaptive optics

et al. 2014

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Conventional solar adaptive optics uses one deformable mirror (DM) and one guide star for wave-front sensing, which seriously limits high-resolution imaging over a large field of view (FOV). Recent progress toward multiconjugate adaptive optics indicates that atmosphere turbulence induced wave-front distortion at different altitudes can be reconstructed by using multiple guide stars. To maximize the performance over a large FOV, we propose a solar tomography adaptive optics (TAO) system that uses tomographic wave-front information and uses one DM. We show that by fully taking advantage of the knowledge of three-dimensional wave-front distribution, a classical solar adaptive optics with one DM can provide an extra performance gain for high-resolution imaging over a large FOV in the near infrared. The TAO will allow existing one-deformable-mirror solar adaptive optics to deliver better performance over a large FOV for high-resolution magnetic field investigation, where solar activities occur in a two-dimensional field up to 60'', and where the near infrared is superior to the visible in terms of magnetic field sensitivity.

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Section: Introductionmentioning

confidence: 99%

Solar tomography adaptive optics

et al. 2014

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“…We observed a quiet-Sun region near disk center (110″, 21″) for 2.75 hr starting at 14:15:11 UT on 2019 April 25 using the IBIS (Cavallini 2006) that was installed at the Dunn Solar Telescope (DST) in Sunspot, New Mexico, along with the DST's high-order adaptive optics system (Rimmele et al 2004). IBIS sampled the absorption-line profiles of Fe I λ7090, K I λ7699, and Fe I λ5434 with a spatial sampling of 0 096 pixel -1 and an overall time cadence of 11.88 s. The time delay between the sequential sampling of the three line profiles is 0.0, 3.26, and 7.24 s, respectively.…”

Section: Observationsmentioning

confidence: 99%

Multiheight Observations of Atmospheric Gravity Waves at Solar Disk Center

Vesa

Jackiewicz

Reardon

2023

ApJ

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Atmospheric gravity waves (AGWs) are low-frequency, buoyancy-driven waves that are generated by turbulent convection and propagate obliquely throughout the solar atmosphere. Their proposed energy contribution to the lower solar atmosphere and sensitivity to atmospheric parameters (e.g., magnetic fields and radiative damping) highlight their diagnostic potential. We investigate AGWs near a quiet-Sun disk center region using multiwavelength data from the Interferometric Bidimensional Spectrometer and the Solar Dynamics Observatory. These observations showcase the complex wave behavior present in the entire acoustic-gravity wave spectrum. Using Fourier spectral analysis and local helioseismology techniques on simultaneously observed line core Doppler velocity and intensity fluctuations, we study both the vertical and horizontal properties of AGWs. Propagating AGWs with perpendicular group and phase velocities are detected at the expected temporal and spatial scales throughout the lower solar atmosphere. We also find previously unobserved, varied phase difference distributions among our velocity and intensity diagnostic combinations. Time–distance analysis indicates that AGWs travel with an average group speed of 4.5 km s−1, which is only partially described by a simple simulation, suggesting that high-frequency AGWs dominate the signal. Analysis of the median magnetic field (4.2 G) suggests that propagating AGWs are not significantly affected by quiet-Sun photospheric magnetic fields. Our results illustrate the importance of multiheight observations and the necessity of future work to properly characterize this observed behavior.

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“…The MCAO concept has also been tested in solar observation. 30,31 If tomographic wavefront sensing is used to control one deformable mirror then it is possible to optimize the correction in any single direction within the field defined by the guide stars. When the guide stars are formed using lasers, then this approach is referred to as laser tomography, or LTAO.…”

Section: Laser Tomographymentioning

confidence: 99%

Review of astronomical adaptive optics systems and plans

Devaney

2007

SPIE Proceedings

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Adaptive Optics systems are now working successfully on all major optical telescopes. The sky coverage of these systems is severely limited by the need for bright guide stars, and Laser guide stars have been under development since they were proposed in the 1980s. Laser guide star assisted AO has recently been commissioned at major observatories, and is finally starting to perform well enough, and reliably enough to provide for astrophysical results. The state of the art in astronomical adaptive optics is reviewed here, with emphasis on laser guide star systems. The prospects and challenges of adaptive optics and laser guide stars on the next generation of 'Extremely Large Telescopes' are also examined.

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Progress with solar multi-conjugate adaptive optics at NSO

Cited by 11 publications

References 0 publications

Solar tomography adaptive optics

Solar tomography adaptive optics

Multiheight Observations of Atmospheric Gravity Waves at Solar Disk Center

Review of astronomical adaptive optics systems and plans

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