Today in Astronomy 142 - Astro Pas Rochester

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Radiative transportoptical depth dI = Id⌧dId⌧ =II(⌧) =Ie ⌧light missingintegrateτ is unit lessopticalZdepth⌧ = apple⇢dsκopacity units g -1 cm 2κρ units cm -1amount of light goingmissing per unitlengthAstronomy 142 6
Mean free pathκopacity units g -1 cm 2κρ units cm -1amount of light going missing per unit lengthabsorption per unit lengthκρ = n σn particles per unit volume (cm -3 )σ cross section (cm 2 )l = (n σ) -1 = (κρ) -1 (cm) how far a photon goes before getting absorbedthe mean free pathAstronomy 142 7
Page 1 and 2: Today in Astronomy 142More on the S
Page 3 and 4: In detail:absorption linesare also
Page 5: Radiation transportkeeping track of
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
Page 30 and 31: Energy sources for the Sun (continu

Today in Astronomy 142 - Astro Pas Rochester

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