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also co·ro·no·graph  (kə-rō′nə-grăf′)
A telescope or an attachment for a telescope equipped with a disk that blacks out most of the sun, used to photograph the sun's corona.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(kəˈrəʊnəˌɡrɑːf; -ˌɡræf) or


(Astronomy) an optical instrument used to simulate an eclipse of the sun so that the faint solar corona can be studied
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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References in periodicals archive ?
The coronagraph instrument would enable simultaneous measurements of the Sun's magnetic field structure and velocity of coronal mass ejections, or CMEs.
The coronagraph mask blocks the otherwise blinding light from the star--but some still manages to seep through, seen here as scattered light.
To understand the corona, DeForest and his colleagues started with extended exposures of STEREO-A's coronagraph images -- pictures of the Sun's atmosphere produced by a special telescope that blocks out light from the bright solar disk.
The dark region at the centre of the image is due to a coronagraph, a mask which blocks the blinding light of the central star and allows astronomers to detect its much fainter disc (rotating circumstellar disk of dense gas and dust surrounding a young newly formed star) and its planetary companion.
This presentation will discuss the three main components needed to directly image an exoplanet: a coronagraph, a deformable mirror, and an algorithm.
Swartzlander, "Experimental verification of an optical vortex coronagraph," Phys.
(2002) used both SOHO (the large angle spectrometric coronagraph instrument on the solar and heliospheric observatory) images and CCD images to measure the V-filter (wavelength ~0.54 [micro]m) brightness of Mercury at solar phase angles between 2[degrees] and 170[degrees].
6) are observed using a white-light coronagraph, which is a telescope that effectively produces an artificial total solar eclipse, blocking the light from the photosphere of the Sun and recording the faint light that is visible because of the scattering of photons off of electrons in the corona.
( The memo suggested a number of changes to the design of WFIRST, including cost reductions to both its main "widefield" instrument as well as a separate coronagraph instrument according to a report by ( Spacenews .
Both from Hinode Extreme Ultraviolet Spectrometer (EIS) observation 43) and from ground-based coronagraph observations, (26) turbulent motions of a 2 MK plasma are most active near the footpoint regions and decrease with height.
They were detected in the outer corona beyond 2.2[R.sub.[dot encircle]] in images as observed from the Solar and Heliospheric Observatory/Large Angle Spectroscopic Coronagraph (LASCO/C2 coronagraph [37]).