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Astronomy ch.3
| Question | Answer |
|---|---|
| photosphere ? | visible surface of the sun |
| Why are we able to see the photosphere? | it is a thin layer that is hot and dense that produces enough light to see |
| granulation? | fine structure visible on solar surface caused by rising currents of hot gass and sinking currents of cool gas below surface |
| chromosphere | bright gases just above the photosphere of the sun |
| corona | faint outer of sun composed of low density very hot, ionized gas |
| absorption spectrum | spectrum that contains absorption lines and the way we know what's in the sun's atmosphere |
| two most common elements in the sun | hydrogen and helium |
| Cecilia's Payne's contribution to our knowledge of the sun | she introduced the idea that stars are made of hydrogen and helium |
| helioseimology | study of the sun by the analysis of it's models vibrations, way we learn about the sun's interior |
| magnetic field | region where magnetic forces can occur often represented by magnetic field lines |
| what do magnetic fields affect | the motion of charged particles |
| what leads to sun spots | where there’s a strong magnetic field within the sun, this can disrupt convection currents,convection brings heat from the sun’s interior out towards the atmosphere |
| sun cycle | sun cycle approxumately 11 yrs over , mannetic field becomes more complex and tangled, then reverts to a simpler configuration this shows up as cycle of increasing and decreasing number of sun spots |
| coronal mass | gas trapped in sun's magnetic field |
| what is sun powed by | conversion of mass-enegy (nuclear energy) to thermal energy |
| Mass enegy | described by Einstein quation E= mc^2 |
| proton proton chain | series of three nuclear reactions that build a helium atom by adding together protons; the main energy source in the Sun. |
| what does proton proton involve | involves the conversion of four hydrogen nuclei to a helium nucleus |
| resulting helium | resulting helium nucleus has slightly less mass that the original four hydrogen nuclei, the energy from his mass differences is converted into thermal energy |
| thermal energy | the energy associated with the motion and interactions of all the tiny particles that make up a substance |
| gamma rays | carry energy outward through the radioactive zone , gamma rays are absorbed in the convection zone where their energy is converted to thermal energy , the thermal energy drives the convection in the convection zone |
Created by:
as12
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