The Sun and the Origins of the Solar System

The Sun and the Origins of the Solar System — page 9
The Sun and The Origins Of The Solar System he discovered with the American astronomer Seth Barnes Nicholson Nicholson the law of sunspot polarities Later in Photograph of a solar eclipse at Rivabellosa Spain July 18 1860 team 1953 the American father and-son of astronomers Harold and Horace Babcock working with the same instruments developed the magnetograph with which the polar field was detected In the 1930s the French astronomer Bernard Lyot introduced the coronagraph which made possible spectral observations of the corona when the Sun is not in eclipse and the birefringent filter filter which permitted two-dimensional monochromatic images With the Lyot filter cinematography of the solar activity of magnetic and velocity fields became a reality In the 1960s the American astronomer Robert Leighton modified Hale’s spectroheliograph so that it could measure measure both velocities and magnetic fields and with it discovered discovered solar oscillations 14