coronagraph

American  

[kuh-roh-nuh-graf, -grahf] / kəˈroʊ nəˌgræf, -ˌgrɑf /

Or coronograph

noun

Astronomy.

1. an instrument for observing and photographing the sun's corona, consisting of a telescope fitted with lenses, filters, and diaphragms that simulate an eclipse.

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coronagraph British  

/ -ˌɡræf, kəˈrəʊnəˌɡrɑːf /

noun

1. an optical instrument used to simulate an eclipse of the sun so that the faint solar corona can be studied

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Other Word Forms

• coronagraphic adjective

Etymology

Origin of coronagraph

1885–90; earlier coronograph. See corona, -graph

Example Sentences

Prof Ramesh is the principal investigator on Visible Emission Line Coronagraph, or Velc - the most important of the seven scientific instruments on Aditya-L1 - and closely monitors and decodes the data it gathers.

From BBC

"Aditya-L1's coronagraph is the exact size that lets it nearly mimic the Moon, fully covering the Sun's photosphere and allowing it an uninterrupted view of almost all of the corona 24 hours a day, 365 days a year, even during eclipses and occultations," says Prof Ramesh.

From BBC

In other words, the coronagraph acts like an artificial Moon, blocking the Sun's bright surface to let scientists continuously observe its faint outer corona -something the real Moon does only during eclipses.

From BBC

The larger one, known as the Coronagraph spacecraft, will explore the Sun’s corona, or outer atmosphere, while the smaller spacecraft Occulter will take a voyage through the same region with special navigation sensors and low-impulse thrusters that will allow the Coronagraph to do its job.

From Salon

India’s coronagraph, Prof Ramesh says, has a slight advantage over the coronagraph in Nasa-ESA's joint Solar and Heliospheric Observatory.

From BBC