Today in Astronomy 142 - Astro Pas Rochester

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Energy sources for the Sun (continued)How could the Sun convert mass-energy to radiation?! Nuclear fusion: basically the liberation of mass energystored as potential energy of the strong nuclearinteraction.Would this work under the conditions known to prevail atthe center of the Sun?! Yes. Requires such conditions, in fact.To demonstrate these answers we need to talk a bit about thefundamental interactions of matter.Astronomy 142 30
Summary! Phenomenology of the Sun: sunspots, active regions,magnetic activity, solar cycle, solar dynamo.! Solar structure: radiative core and convection zone,photosphere, chromosphere, corona.! Solar energy problem. Only nuclear reactions provide aplausible energy source for the billion year timescale thatthe Sun has been luminous.! Opacity and radiative transportAstronomy 142 31
Page 1 and 2: Today in Astronomy 142More on the S
Page 3 and 4: In detail:absorption linesare also
Page 5 and 6: Radiation transportkeeping track of
Page 7 and 8: Mean free pathκopacity units g -1
Page 9 and 10: Opacity depends onwavelength becaus
Page 12 and 13: Solar “granulation:” the tops o
Page 14 and 15: Using Adaptive Optics to look at de
Page 16 and 17: Further out: the corona and chromos
Page 18 and 19: Sunspots: solar magnetismFigure: Ch
Page 20 and 21: Sunspot progress, activity during s
Page 22 and 23: 11-year sunspot cycle, for the last
Page 24 and 25: Sunspot formation and cycle: intera
Page 26 and 27: Cooling timescaleAstronomy 142 26
Page 28 and 29: Energy sources for the SunChemical

Today in Astronomy 142 - Astro Pas Rochester

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