ASTR 1346 1st Edition Lecture 6 Outline of Last Lecture I Nuclear Fusion A E mc 2 B Neutrinos II Composition of Solar Atmosphere A Granules B Sunspots C Sunspot Maximum and Minimum D Solar Magnetism E Sunspot Cycle Outline of Current Lecture I Characteristics of the Sun A Active Regions B Prominences C Solar Filaments D Flares II Chromosphere III Corona IV Core V Characterizing Stars A Stellar Spectra Current Lecture l A Active regions on the Sun are in the photosphere surrounding a sunspot group B Prominences are loops or sheet like structures of glowing gas ejected from an active region of the photosphere C Solar Filaments are prominences viewed from a different perspective so it s against the Sun instead of space Particles take 3 4 minutes to come to Earth while light takes 8 minutes D Flares are the most powerful explosions in the solar system The temperature can reach 100 million K and the energy is equal to millions of bombs These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute ll The chromosphere lies just outside the photosphere and is almost completely transparent It is reddish due to hydrogen alpha emission spectra Spicules are jets of gas lll The corona has streamers plumes loops and coronal holes associated with open magnetic fields found at the Sun s poles Solar wind streams off the corona in all directions and speeds of 400km s Coronal mass ejection are giant magnetic bubbles that separate from the Sun and escape into space lV The core consists of gamma rays the photosphere of visible light the chromosphere of UV rays and the corona of X Rays Except for the core all of these give off visible light V A Stellar spectra differences are only due to different temperature stars that are classified into the following categories O B A F G K M L T O stars are the hottest stars while B T temperature decreases L and T stars are new and our Sun is classified as a G2 star