Word: sunning
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Dates: during 1960-1969
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...astronomers have aimed their telescope at several features on the sun, including "active regions"-the eruptions of hot material that appear against the "cooler" regions of the sun's surface. Active regions increase and decrease over an 11-year cycle. "This year is supposed to be a solar maximum-a period of maximum solar activity-but in spite of that, the sun has been notoriously quiet," Reeves said. "But this week the sun has perked up again...
...haven't discovered any outstanding new phenomena," Reeves added, "but a great many observations that had been qualitative are now quantitative. Now you can start calculating the sun's behavior...
Besides observing the sun, the OSO-VI telescope has measured the absorption of ultraviolet light by the earth's upper atmosphere an important factor in the earth's weather...
...Harvard experiment is contained in a 40-inch box that is open at one end. The box is plated with gold to distribute heat evenly. A cluster of 13 light detectors-much like the electric eye on a camera-keeps the box pointed at the sun. A small telescope mirror collects solar rays coming through the open end of the box and then reflects them onto a diffraction grating, a row of closely-scaped lines that breaks the light up into a spectrum. This spectrum constantly changes as different chemical reactions occur on the sun...
...small motor moves the diffraction grating to examine any one of 10,000 different wavelengths or areas of the spectrum. A second motor keeps the telescope aimed at a single point, or else it shifts the entire telescope back and forth to scan small areas of the sun. It thus obtains a television picture in a particular type of ultra-violet light...