Description
Transcript: The diffuse solar corona expands rapidly into deep space, and charged particles are blasted out from the site of sunspots and flares on the solar surface. The result of these two effects is the solar wind. The solar wind is a diffuse stream of charged and energetic particles traveling out into space. At the distance of the Earth the speed is four hundred to a thousand kilometers per second, and the temperature is two hundred thousand degrees Kelvin although little heat is transmitted to the Earth because the solar wind is so diffuse. It extends past the orbit of Saturn. The solar wind creates substantial effects on the Earth when it interacts with the Earth’s magnetosphere.
Transcript: Physicists in the nineteenth century made various estimates of the age of the Sun, but they were fundamentally unaware of the most efficient energy source known. Early in the twentieth century physicists Rutherford and Becquerel began a systematic study of the phenomenon of...
Published 07/24/11
Transcript: Chemical energy cannot power the Sun, so what is the energy source? Inspired by an idea by the German physicist Hermann von Helmholtz the English physicist Lord Kelvin explored the idea of gravitational contraction. In this mechanism the Sun is slowly shrinking and gravitational...
Published 07/24/11
Transcript: Above the solar chromosphere is the corona, a diffuse outer layer of gas at the amazing temperature of two million degrees Kelvin. Both the chromosphere and the corona have higher temperatures than the photosphere. How can this be? One way for gas to become hot is pressure. Higher...
Published 07/24/11