ASTR 1514 1st Edition Lecture 26Studying the Interior of the Sun-Only the surface of the sun is visible – Where the photons scatter last before being collected by our telescopes. -Two ways for knowing that fusion is happening in the center of the sun1. Neutrinos2. HelioseismologyNeutrinos- Hydrogen fusion emits neutrinos- Neutrinos: light atomic particles with no charge- Very weak interactions with matter- Should escape the core freely- Photons take rough paths out of the suns interior.- Neutrinos pass right on through in just two seconds- So if neutrinos are found then they constitute evidence that fusion is happening in the sun- Solar neutrino experiments – These notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.- detect rare interactions- Can measure the rate and types that arrive at Earth - Rate agrees with prediction and with experiments on neutrino physics- Davis Solar Neutrino Experiment- Used dry cleaning fluid- Buried 1 mile deep in South Dakota gold mine to shield the tank from cosmic rays - Detected 1 neutrino per day Helioseismology: - We model the Earth’s interior by studying earthquakes. - Seismic waves travel differently through different materials- Helioseismology – Sound waves move through the sun making the surface and interior waves- Doppler Shifts give the speed of wav motion- Speeds depend on the suns composition and the depth of the convection zone.Observations agree with
View Full Document
Unlocking...