Article Synopsis
- Advancements in adaptive optics systems have enabled observations of the Sun's corona, revealing fine structures that may explain rapid eruptions and heating processes.
- Current limitations of these systems primarily hinder the analysis of coronal dynamics, but new techniques have achieved significantly improved spatial resolution.
- Observations have unveiled fast-moving, twisted features and coronal rain material at scales below 100 km, paving the way for further discoveries in solar research.
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Article Abstract
Resolving fine structures in the Sun's corona may provide key insights into rapid eruptions and the heating of the corona. Adaptive optics systems have been used for over two decades to reach the diffraction limit of large telescopes, thereby compensating for atmospheric image blur. Current systems, however, are still limited to observations of the solar disk and fail with coronal objects, leaving fundamental coronal dynamics hidden in that blur. Here we present observations with coronal adaptive optics reaching the diffraction limit of a 1.6-m telescope to reveal very fine coronal details. Furthermore, we discovered a short-lived, fast-moving, finely twisted feature occurring during the decay phase of a flare that quickly destabilized. Coronal adaptive optics increased the spatial resolution by an order of magnitude at visible wavelengths. We report here a large portion of off-limb coronal rain material with observed scales below 100 km. This new adaptive optics scheme opens opportunities for observational discoveries at small scales beyond the solar limb in the highly dynamic corona by exploiting the diffraction limit of large ground-based telescopes.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC12360950 | PMC |
| http://dx.doi.org/10.1038/s41550-025-02564-0 | DOI Listing |
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