2/6/18 1 ASTR 1040: Stars & Galaxies Prof. Juri Toomre TAs: Peri Johnson, Ryan Horton Lecture 7 Tues 6 Feb 2018 zeus.colorado.edu / astr1040 - toomre Solar granulation Topics for Today and Thur • Consider Sun’s energy source ( fusion H -- He ) • What about the elusive neutrinos ? • Transport of energy by convection • Helioseismology: acoustic waves excited by convection to probe interior • Finish second read of Chap 14 (Our Star ) , for magnetism discussion on Thurs • Re - read S4.1, S4.2 (quarks, leptons, ..) • Observ # 2 this Thur eve, signup again • HW #2 returned graded Big System View of Sun core radiative zone convection zone - - - - - photosphere chromosphere corona solar wind Convection Zone and Radiative Interior Deep shell (30%) of very turbulent convection Drives strong differential rotation Just below the photosphere: REMINDER Solar Dynamics Observatory ( SDO ) Launched Feb 2010 (4096x4096) EUV and Visible Images HMI Dopplergrams (Photosphere ~ 5000 K) AIA 171 Å (Low Corona ~ 6x10 5 K)
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ASTR 1040: Stars & Galaxies Topics for Today and Thurzeus.colorado.edu/astr1040-toomre/Lectures/Lecture07--6... · 2018. 2. 6. · •Transport of energy by convection •Helioseismology:
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2/6/18
1
ASTR 1040: Stars & Galaxies
Prof. Juri Toomre TAs: Peri Johnson, Ryan HortonLecture 7 Tues 6 Feb 2018zeus.colorado.edu/astr1040-toomre
Solargranulation
Topics for Today and Thur• Consider Sun’s energy source (fusion H--He)• What about the elusive neutrinos ?• Transport of energy by convection• Helioseismology: acoustic waves excited by
convection to probe interior• Finish second read of Chap 14 (Our Star),
for magnetism discussion on Thurs • Re-read S4.1, S4.2 (quarks, leptons, ..)• Observ # 2 this Thur eve, signup again • HW #2 returned graded