Nuclear reactions in the Sun课件.pptVIP

Nuclear reactions in the Sun;Episode I;A first look at the Sun;Who measured the solar mass?;Solar mass;Solar Luminosity; Solar Radius;Solar Age;Solar Metal abundance;A remark: Helium abundance; density: r =3Mo/(4pRo3) ?1.5 g/cm3 pressure P ? GMo2/Ro4? 1016 dine/cm2 Sound speed vs ? (P/r) 1/2 ? 800 Km/s photon mean free path*: l=1/(ne sTh) ? 1/(1024 cm-3 10-24 cm2) ? 1 cm (photon escape time ?2 104 yr) Cumulated energy production DE =Lot ? 10-4 Moc2 typical nuclear energy scale;Sun energy inventory;A digression:The Earth energy inventory;What is the source of terrestrial heat?;The birth of Nuclear Astrophysics;Nuclear reactions in the sun? The temperature scale;The gross solar structure;How can we look at the solar interior?;Helioseismology;Method;The modes;Helioseismic inferences;Standard Solar Model (SSM);SSM before Helioseismology: 3 data and 3 parameters;The impact of helioseismology on SSM;List of applications of helioseismology;Solar rotation;An example: the helioseismic determination of p+p cross section (Spp);Can helioseismogy probe the core of the Sun? ;Can helioseismogy measure the solar temperature?;Can helioseismogy prove that the Sun is shining by nuclear reactions? ;A first summary ;See you later...