AST 1002 Lecture Notes - Lecture 10: Trade Union Confederation Of The Americas, Maunder Minimum, Super-Kamiokande
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In visible light, it looks like a bright sphere. Hydrostatic equilibrium: pressure (cid:894)fro(cid:373) heat(cid:895) (cid:271)ala(cid:374)(cid:272)es gra(cid:448)it(cid:455)"s pull to(cid:449)ard the (cid:272)e(cid:374)ter. This balance leads to a spherical ball of gas. Sun is (cid:1005)(cid:1004)9(cid:454) larger tha(cid:374) earth, e(cid:448)e(cid:374) larger tha(cid:374) the moo(cid:374)"s or(cid:271)it arou(cid:374)d earth. Luminosity: total light energy emitted per second. Core (2,000 km)-where hydrogen is burned, radiation zone (300,000 km), convection zone (200,000), photosphere (500 km), chromosphere (1500 km), transition zone (8500 km) Like earthquakes, disturbances on the sun propagate as waves. Vi(cid:271)ratio(cid:374)s o(cid:374) the surfa(cid:272)e lead to doppler shifts (cid:894)red a(cid:374)d (cid:271)lue pat(cid:272)hes(cid:895), gi(cid:448)i(cid:374)g us (cid:862)(cid:373)aps(cid:863) of the. The density of the sun is highest in the core, temperature highest in the core. Radiative zone: in the hot interior, ions have no bound electrons. Photo(cid:374)s (cid:374)ot a(cid:271)sor(cid:271)ed, photo(cid:374)s s(cid:272)atter a(cid:374)d (cid:373)igrate out (cid:862)easil(cid:455)(cid:863), photo(cid:374)s (cid:272)arr(cid:455) e(cid:374)erg(cid:455) (radiation) Convention zone: in cooler regions, ions have bound electrons. Radiation is trapped, heating the gas, but hotter gas rises.
