Advances in Solar Research at Eclipses from Ground and from by Magda Stavinschi (auth.), Jean-Paul Zahn, Magda Stavinschi

By Magda Stavinschi (auth.), Jean-Paul Zahn, Magda Stavinschi (eds.)

The goal of this complex research Institute used to be to provide an account at the most up-to-date effects acquired in sun learn. Bucharest used to be selected to host it, as the capital urban of Romania was once situated correct in the course of the totality direction of the final eclipse of the millennium, on eleventh August 1999; moreover the phenomenon used to be as regards to succeed in there its longest length: 2m 23s. this type of overall eclipse is not just a really fabulous occasion which attracts the crowds: to astronomers, sunlight eclipses nonetheless provide the easiest stipulations for staring at the reduce a part of the corona. The sunlight performs an important function in our very life. It used to be chargeable for the formation of the Earth, and rendered this planet healthy to host residing beings, delivering the correct amount of warmth, and this for an extended sufficient span of time. rather understandably, it has constantly been a first-rate aim of human interest, and extra lately one in all clinical research. over the last century, it used to be discovered that the sunlight is a celeb like billions of others; we discovered in view that that it attracts its power from the nuclear fusion of hydrogen, and we're now in a position to estimate its age and lifestyles expectancy.

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Extra info for Advances in Solar Research at Eclipses from Ground and from Space: Proceedings of the NATO Advanced Study Institute on Advances in Solar Research at Eclipses from Ground and from Space Bucharest, Romania 9–20 August, 1999

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The Williams College expedition to Ramnicu Valcea, Romania, made observations of the solar corona (a) to compare with the Extreme ultraviolet Imaging Telescope (EIT) on the Solar and Heliospheric Observatory; (b) to search for the source of coronal heating through a study of the oscillatory power spectrum of coronal loops in an emission line typical of high temperature; (c) mapped the coronal temperature using ultraviolet continuum observations; (d) made videos and still photographs of coronal motions and details; and (e) collaborated with the scientists at the Astronomical Institute in Bucharest.

Most of the CMEs appear right at the solar limb, and in this case the measurement of the angular dimension is quite precise. A short analysis of a CME in the phase of minimum solar activity permits to point out several essential aspects, sometimes even strange, of this phenomenon, namely: (a) The angular width of a CME is many times bigger than that of the associated solar activity phenomenon. The values of the CMEs expansion speeds, as well as the presence of an almost continuous acceleration, require the existence of some effective "driving" mechanisms over huge distances, of several solar rays.

Another difference is due to the difference between Terrestrial Time (uniform) and Universal Time (nonuniform, connected to the Earth rotation). Different values give different moments for conjunction and different values of the moments and longitudes in the phases of the eclipses. 7. 1 OCCULTATIONS At a first sight, an occultation and an eclipse seem to be the same phenomenon: for the one as for the other, a body is hidden. But, during an occultation one celestial body passes in front of the other and the light of the second body is obscured by the first one.

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