| In other words, a coronagraph produces an artificial solar eclipse. |
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| By the time their orbits take them close to the Sun so they become bright, they are lost in the Sun's glare and require a space-based coronagraph like that on SOHO to be seen. |
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| Figure 1: The solar corona and the solar wind observed by a SECCHI coronagraph on a STEREO probe. |
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| In 1930 the French astronomer Bernard Lyot invented the coronagraph, a specialized telescope that produces an artificial eclipse of the Sun. |
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| The corona can also be studied under noneclipse conditions with a special telescopic instrument called a coronagraph. |
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| The coronagraph, as this special telescope is called, must be located at a high altitude to be effective. |
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| This week, in Nature, Eugene Serabyn of the Jet Propulsion Laboratory in California and his colleagues describe a stunning implementation of what is known as an optical vortex coronagraph. |
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| In a coronagraph the light from the solar disc reaches the instrument, it is thus necessary to mask it with an occulter disc, which acts in a similar way the role of the Moon. |
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| The system then blocks the star with a device called a coronagraph, revealing the exoplanet. |
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| Scientists use this kind of picture, called a coronagraph, in which the sun is obscured, to better see the sun's atmosphere, the corona. |
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| By using a coronagraph, which is a telescope attachment that blocks out the bright light given off by a star, astronomers spotted something orbiting Alcor. |
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| Pasachoff's team at Maui's Haleakala Observatory snapped some 660,000 images of the transit using a coronagraph, a special telescope that blocks part of the sun's brightness. |
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| Hours before ISON reached perihelion, stunning images taken by SOHO's Large Angle and Spectrometric Coronagraph showed the bright, elongated tail of the onrushing comet. |
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