Word: corona
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During the 3 minutes of the eclipse's totality, Jay M. Pasachoff 63, research associate in Astrophysics, will photograph the spectrum of the sun's corona-the shifting white halo of ionized gases that extends millions of miles from the sun's surface. These visible light spectra will provide a detailed picture of the chemical and physical events in the corna...
Winfield W. Salisbury, lecturer inAstronomy, will also study how the corona's light waves are oriented or polarized. The corona's polarization can reveal how the sun's magnetic field changes through space...
...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...
...second experiment involves the use of four special television cameras to measure the intensity of polarization of the outer corona in various colors. The third experiment is a repeat of photography carried out for the Harvard astronomers at the 1968 eclipse in Siberia. Pictures of the eclipse will be taken through polarized filters at different angles with a specially designed telescope...