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<p>Restoration of solar images to achieve near diffraction-limited spatial resolution is commonly implemented on large-aperture solar telescopes. However, the extent of the restored field-of-view is typically only 100<sup>′′</sup> or even smaller. This study reports on wide-field image restoration of G-band and Ca <span>ii</span> K images obtained with the 0.7-meter Vacuum Tower Telescope (VTT) at Observatorio del Teide, Tenerife, Spain. The Kiepenheuer Adaptive Optics System (KAOS) at the VTT provides a field-of-view with a diameter of 270<sup>′′</sup>. Time series of datasets with 100 images were acquired with a large-format (7920 × 6004 pixels) CMOS imager at a frame rate of 30&#xa0;Hz. An experimental optical setup that enabled wide-field imaging is briefly presented. Results from speckle-masking imaging and Multi-Frame Blind Deconvolution (MFBD) demonstrate the unique potential of the VTT for wide-field imaging. Power spectral analysis quantifies the instrument performance as a function of time and with distance from the lock point of the AO system. Further science capabilities are established using Local Correlation Tracking (LCT), Background-subtracted Solar Activity Maps (BaSAMs), and image quality/seeing metrics. In summary, commercial off-the-shelf camera systems can become an asset to sub-meter-class solar telescopes and open up new science opportunities at the interface between large-aperture and synoptic solar telescopes.</p>

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Wide-Field Image Restoration of G-Band and Ca ii K Images Containing Large and Complex Active Regions

  • 期刊论文

  • 发表日期：

    2025年5月9日

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  • Robert Kamlah,
  • Meetu Verma,
  • Carsten Denker,
  • Ioannis Kontogiannis,
  • Alexander G. M. Pietrow,
  • Jürgen Rendtel,
  • Emily Lößnitz,
  • Arooj Faryad,
  • Reiner Volkmer,
  • Rolf Schlichenmaier,
  • Thomas Berkefeld,
  • Miguel Esteves,
  • Olivier Grassin,
  • Markus Roth

摘要

Restoration of solar images to achieve near diffraction-limited spatial resolution is commonly implemented on large-aperture solar telescopes. However, the extent of the restored field-of-view is typically only 100′′ or even smaller. This study reports on wide-field image restoration of G-band and Ca ii K images obtained with the 0.7-meter Vacuum Tower Telescope (VTT) at Observatorio del Teide, Tenerife, Spain. The Kiepenheuer Adaptive Optics System (KAOS) at the VTT provides a field-of-view with a diameter of 270′′. Time series of datasets with 100 images were acquired with a large-format (7920 × 6004 pixels) CMOS imager at a frame rate of 30 Hz. An experimental optical setup that enabled wide-field imaging is briefly presented. Results from speckle-masking imaging and Multi-Frame Blind Deconvolution (MFBD) demonstrate the unique potential of the VTT for wide-field imaging. Power spectral analysis quantifies the instrument performance as a function of time and with distance from the lock point of the AO system. Further science capabilities are established using Local Correlation Tracking (LCT), Background-subtracted Solar Activity Maps (BaSAMs), and image quality/seeing metrics. In summary, commercial off-the-shelf camera systems can become an asset to sub-meter-class solar telescopes and open up new science opportunities at the interface between large-aperture and synoptic solar telescopes.