Word: coronas
(lookup in dictionary)
(lookup stats)
Dates: during 1970-1979
Sort By: most recent first
(reverse)
Although only two per cent of the sun will be visible in Cambridge on March 7, this sliver will effectively block out the scientifically interesting portion of the sun, the outer corona. Therefore, in order to perform several experiments which require a total eclipse, scientists from around the world will be convening in southern Mexico...
...Practical Astronomy and former director of the Harvard College Observatory, will set up camp in Miahautlan, an Indian village south of Oaxaca. This will be Menzel's 13th eclipse. "The sun has been my specialty, and there is still no better method of observing the sun's outer corona than by watching an actual eclipse," he said...
...expedition will carry out three major experiments, all involving the outer corona. This is a tenuous gas, thinner than any man-made vacuum, and heated by two million degrees centigrade. Although the inner part of the corona can be seen through special narrow band filters without an eclipse, a total solar eclipse is essential to study the whole structure, including the outer portion, of the corona...
...first, a spectrograph, was designed by James G. Baker, associate of the Harvard College Observatory. This instrument. weighing a ton, uses 16-inch mirrors and a four-by-six-inch grating with 15,000 individually ruled lines in each inch. According to Menzel, spectroscopic photographs of the outer corona have never been made with such sophisticated equipment...