Physics – Optics
Scientific paper
Oct 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000spd....3102107r&link_type=abstract
American Astronomical Society, SPD Meeting #31, #021.07; Bulletin of the American Astronomical Society, Vol. 32, p.1290
Physics
Optics
Scientific paper
The Dutch Open Telescope (DOT) on La Palma in the Canary Islands is a small but revolutionary solar telescope of which the image quality matches the superb imaging of the Swedish Vacuum Solar Telescope (from whose building the DOT is operated). The DOT is an open parabolic 45cm reflector on an open 15m high tower, relying on mirror flushing by the trade winds that bring the best seeing at La Palma to avoid internal turbulence. A water-cooled field stop in the primary image reflects most sunlight and heat out of the telescope. The first data from the DOT combined with speckle reconstruction have yielded sunspot movies of outstanding quality. At present, a multi-channel imaging system is in construction for simultaneous registration of speckle sequences in the G band, in Ca II K and in Hα. The data pipeline permits continuous speckle data acquisition up to 0.5 Tb per day. The advantage of speckle reconstruction over adaptive optics is the much larger field of the restored scene, with the DOT camera's 100x130 arcsec at 0.2 arcsec resolution. The DOT science program is to study magnetic topology and dynamics throughout the photosphere and chromosphere.
Bettonvil F. M.
Hammerschlag Robert H.
Rutten Robert J.
Suetterlin Peter
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