Word: corona
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Prediction of solar disturbances, including sunspots, is largely a project of the University's High Altitude Observatory in Colorado. According to Dunn, when a green line is visible in the sun's corona, sunspots can be expected in the next few days. The line is associated with the same incandescent gases which cause the sunspots...
...Corona, Calif...
...added that this same material, by scattering the light from the sun at the time of a total solar eclipse, contributes to the brightness of the corona--the ring or light remaining when the sun is completely blocked by the moon...
Menzel, whose thermometers must reach 93,000,000 miles, seems to have the tougher job. The temperature of the sun is 6000 Centigrade, but the temperature of the corona, which the naked eye can see only during total eclipses, appears to be 1,000,000. That's what Menzel is trying to explain, but it's only one of his worries...
...station in New Mexico, close to the site of the first atom bomb. The observatories are equipped with spectrohelioscopes-- astronomical X-ray machines that penetrate to the inner layers of the sun--and with coronoscopes, which blot out the sun like an eclipse, so that the other corona can be watched. Menzel went west a few months ago to spend all his time at the solar stations, on the Astronomy Department's biggest project...