336929
| Question | Answer |
| Solar luminosity | The rate at which energy is radiated by the Sun (J/s)( the total amount of energy radiated per second). It is denoted by the symbol Lo |
| almost all the light comes from a layer... | 500 km thick called the photosphere |
| Average temperature of the photosphere (*surface?) | 6000K (most light comes from region of this temperature) |
| limb darkening | gradual fall-off in brightness (the edge of the solar image is known as the solar limb) |
|
Image:
sun_spot.gif (image/gif)
|
sunspots dark blotches on photosphere |
| decribe limb darkening using -density and lines of sight -diagram | |
| at which position do we see to the greatest depth below the surface of the cloud, and at which position do we see to the shallowest depth below the surface of the cloud? | The line of sight that penetrates to the greatest depth is that which is directed towards the centre of the cloud. The lines of sight that reach the shallowest depths are those near the limb of the cloud |
| differential rotation | points on the solar equator have a different sidereal period to the points further north or south |
| sidereal period | period as measured with respect to the stars |
| solar activity cycle | 11 years |
| solar granulation – a seething pattern of bright cell-like granules on photosphere. Each granule 1000 km lives for five to ten minutes. | |
| wave speed | speed= frequency x wavelenght |
| energy of a photon | energy= planck constant (h) x frequency h = 6.63 × 10^(−34) J s |
| chromosphere (meaning the ‘sphere of colour’), and constitutes the inner (or lower) solar atmosphere. | |
| corona | outer region of solar atmosphere (very extensive) |
| h alpha image of the sun frequency 656.3 nm | |
| if the beam came from a source which produces a continuous spectrum it would typically contain | all visible wavelengths, and the result of passing it through the prism would be a multicoloured band somewhat similar to a rainbow. |
| An Halpha image of the solar prominence on the limb |
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