AST101_fall2018_class09_oct04_v2.pdf

E the convective zone contains most of the suns mass

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E. The convective zone contains most of the Sun’s mass.
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AST 101 | UofT | Prof. Gaensler | 11 The Photosphere (I) Credit: NASA
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AST 101 | UofT | Prof. Gaensler | 12 The Photosphere (II) Credit: NASA The “surface” of the Sun (OK, not really, but it’s where sun changes from transparent to opaque) Average temp = 5500 C Only approx 100 km thick! (0.015% of total radius)
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AST 101 | UofT | Prof. Gaensler | 13 Photosphere: A Closer Look Credit: Luc Rouppe van der Voort / Institute for Solar Physics, Oslo The Sun is oozing & bubbling! Photosphere is “granulated” granules approx 1000 km across, last 5-10 minutes hot areas rising, dark areas sinking we’re seeing the top of the convective zone!
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AST 101 | UofT | Prof. Gaensler | 14 The Corona (I) Credit: NASA
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AST 101 | UofT | Prof. Gaensler | 15 The Corona (II) Total eclipse, 21 June 2001, Zambia © Wendy Carlos and Jay M. Pasachoff Halo of gas above photosphere and chromosphere Seen only during total eclipse of the Sun Temp approx 1,000,000 C !
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AST 101 | UofT | Prof. Gaensler | 16 Sunspots (I) Credit: NASA
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AST 101 | UofT | Prof. Gaensler | 17 Sunspots (II) Cooler regions on surface (temperature “only” around 3500 C) Usually seen in pairs Up to 30,000 km across
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AST 101 | UofT | Prof. Gaensler | 18 Sunspots (III) Strong magnetism prevents hot gas from rising up Credit:
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AST 101 | UofT | Prof. Gaensler | 19 Sunspot Counts Complicated magnetic processes taking place inside May effect Earth’s climate Credit: Number of sunspots goes from “lots” to “almost none” on an 11- year cycle Pattern seen going back approx 400 years
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AST 101 | UofT | Prof. Gaensler | 47 Clicker Quiz – 60 Seconds Which of the following statements is FALSE? A. Sunspots are regions of strong magnetic fields. B. Sunspots are cooler regions on the Sun’s surface. C. Sunspots are usually seen in pairs. D. Sunspots are usually larger than the Earth. E. Sunspots are sites of nuclear reactions.
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AST 101 | UofT | Prof. Gaensler | 21 What Powers The Sun? Household light bulb: 12 W The Sun: 380,000,000,000,000,000,000,000,000 W (3.8x10 26 W) Credit: NASA
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AST 101 | UofT | Prof. Gaensler | 22 A Ball Of Fire?
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